SPARQL query throwing compilation error

Hi,
The sparql query is throwing the below error recently.

Virtuoso 37000 Error SP031: SPARQL compiler: Variable ‘ent’ can not be bound due to mutually exclusive restrictions on its value

What is the SPARQL query being executed ?

Also, you imply this is a recently occurring error, thus was the same query executing successfully before, with the same data and Virtuoso binary ?

What is the version of the Virtuoso binary being used ( output of virtuoso-t -? or virtuoso-iodbc-t -? for open source or commercial respectively) ?

Hi,
Thank you for the quick reply. Below are the answers for all the questions.

What is the SPARQL query being executed ?

PREFIX skos: <http://www.w3.org/2004/02/skos/core#> 
PREFIX gvares: <http://semanticwebindia.in/GVA/res/> 
PREFIX gvaont: <http://semanticwebindia.in/GVA/ont/> 
PREFIX owl: <http://www.w3.org/2002/07/owl#> 
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX SIO: <http://semanticscience.org/resource/> 
PREFIX hgncvocab: <http://bio2rdf.org/hgnc_vocabulary:>
PREFIX hgnc: <http://bio2rdf.org/hgnc:>
PREFIX xmlschema: <http://www.w3.org/2001/XMLSchema#> 
PREFIX omim: <http://purl.bioontology.org/ontology/OMIM/>  

        SELECT ?variant ?vartype ?obs ?cat ?catlabel ?show ?grplabel ?value ?ent  
        FROM <http://gva.org> 
        FROM <http://demogva1.org> 

        WHERE { 
        ?variant a gvaont:Variant . FILTER (?variant in ("http://semanticwebindia.in/GVA/res/Var_1_1")).
        ?obs a gvaont:Observation. ?variant gvaont:hasObservation ?obs. 
        ?obs SIO:SIO_000300 ?value. 
        ?obs gvaont:hasCategory ?cat. ?cat skos:prefLabel ?catlabel. ?cat gvaont:hasCategory ?grp. ?grp skos:prefLabel ?grplabel. 
        OPTIONAL {?cat skos:definition ?show}.  
        ?obs gvaont:hasIdentifier ?id. 
        ?obs gvaont:hasLabel ?obslabel. 
        OPTIONAL {?obs gvaont:isAbout ?ent. ?variant gvaont:hasVariantType ?vartype} 
        } 
        ORDER BY ?variant ?obs ?grplabel ?catlabel

you imply this is a recently occurring error, thus was the same query executing successfully before, with the same data and Virtuoso binary ?

Yes, The same query got executed successfully previously with same data and virtuoso binary.

What is the version of the Virtuoso binary being used ( output of virtuoso-t -? or virtuoso-iodbc-t -? for open source or commercial respectively) ?

The version is 07.20.3215

Regards,
Gopi

I was hoping you would have provide the complete version info of the binary including the build date and gitid from the "-?’ output …

But the “3215” engine number would indicate that this is an old Virtuoso open source build from 2017. Is there any reason why you are not using a latest stable/7 or develop/7 build ?

Is your Virtuoso SPARQL endpoint publicly accessible, in which case can you provide a URL to the executed query that can be simply clicked on to see the query running ?

Given the query was running successfully previous, are you sure no new data has been added to the Virtuoso instance since the query last worked ?

Have you run a database integrity check and also the RDF indexes and Metadata with the queries/commands:

  1. RDF Metadata Check:

    DB.DBA.RDF_AUDIT_METADATA (2,’*’) ;

  2. RDF_QUAD Primary Key index check, all counts should be the same value:

    select count (s), count (p ), count (o ), count (g ) from rdf_quad table option (index rdf_quad, check);

  3. Check RDF index counts, which should be “0”:

    select count (*) from rdf_quad a table option (index rdf_quad) where not exists (select 1 from rdf_quad b table option (loop, index rdf_quad_pogs) where a.g = b.g and a.p = b.p and a.o = b.o and a.s = b.s);

    select count (*) from rdf_quad a table option (index rdf_quad_pogs) where not exists (select 1 from rdf_quad b table option (loop, index primary key) where a.g = b.g and a.p = b.p and a.o = b.o and a.s = b.s);

    select count (*) from rdf_quad a table option (index rdf_quad_pogs) where not exists (select 1 from rdf_quad b table option (loop, index rdf_quad_op) where a.g = b.g and a.p = b.p and a.o = b.o and a.s = b.s);

    select count (*) from rdf_quad a table option (index rdf_quad_pogs) where not exists (select 1 from rdf_quad b table option (loop, index rdf_quad_sp) where a.g = b.g and a.p = b.p and a.o = b.o and a.s = b.s);

    select count (*) from rdf_quad a table option (index rdf_quad_pogs) where not exists (select 1 from rdf_quad b table option (loop, index rdf_quad_gs) where a.g = b.g and a.p = b.p and a.o = b.o and a.s = b.s);

Are any other queries giving this or any other errors ?

Hi,
We hereby attach the answers below for all the questions.

I was hoping you would have provide the complete version info of the binary including the build date and gitid from the "-?’ output …

04:06:26 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 1: Unable to locate file }
04:06:26 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 2: Unable to locate file }
04:06:26 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 3: Unable to locate file }
04:06:26 INFO: OpenLink Virtuoso Universal Server
04:06:26 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
04:06:26 INFO: uses parts of OpenSSL, PCRE, Html Tidy
04:06:26 INFO: Database version 3126
04:06:26 INFO: Unlinked the temp db file /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db as its size (34MB) was greater than TempDBSize INI (10MB)
04:06:26 INFO: SQL Optimizer enabled (max 1000 layouts)
04:06:27 INFO: Compiler unit is timed at 0.000126 msec
04:06:32 INFO: Roll forward started
04:06:32 INFO:     63 transactions, 5493 bytes replayed (100 %)
04:06:32 INFO: Roll forward complete
04:06:32 INFO: Checkpoint started
04:06:32 INFO: Checkpoint finished, log reused
04:06:34 INFO: HTTP/WebDAV server online at 8890
04:06:34 INFO: Server online at 1111 (pid 3039)

But the “3215” engine number would indicate that this is an old Virtuoso open-source build **
** from 2017. Is there any reason why you are not using the latest stable/7 or develop/7 build?

We are willing to use stable/7. Our team is working on it.

Is your Virtuoso SPARQL endpoint publicly accessible, in which case can you provide a URL to the executed query that can be simply clicked on to see the query running ?

Sparql endpoint is not publicly available. We can have a 1-on-1 interaction and we will show you the sparql endpoint. You can contact us at gopi@semanticwebindia.com

Given the query was running successfully previous, are you sure no new data has been added to the Virtuoso instance since the query last worked ?

We cleared the whole graph and inserted new tuples. After that, we are facing this issue.

Have you run a [database integrity check] and also the RDF indexes and Metadata with the queries/commands:
Yes, Below are the results of the queries you shared.
point.3. output of all queries is “0”.

How exactly was the indicated task We cleared the whole graph and inserted new tuples performed ie physically what queries/commands were used to clear the graph and insert the new triples, and what was the number of triples clear and then inserted in the graph ? As if the problem started to occur after the graph was cleared and reloaded this is the point to focus on.

Can you provide a copy of the virtuoso.ini configuration and virtuoso.log log files for review.

Note we are in the middle of a new Virtuoso product release and the open source stable/7 branch is about to become what is in the current develop/7 branch, which should be completed by the end of this week, subject to any final issues being found. Thus we would recommend either waiting for the stable/7 branch update to be complete or build from the develop/7 branch, containing all the latest fixes/updates etc.

Hi,

We cleared the graph using the command "CLEAR GRAPH <graph name>. We populated the graph using "INSERT INTO <graph name>.

The number of triples cleared are close to 10K and the triples inserted are close to 500. We are doing this step for a long time and this issue occurred recently.

Below is virtuoso.ini config file:

;
;  virtuoso.ini
;
;  Configuration file for the OpenLink Virtuoso VDBMS Server
;
;  To learn more about this product, or any other product in our
;  portfolio, please check out our web site at:
;
;      http://virtuoso.openlinksw.com/
;
;  or contact us at:
;
;      general.information@openlinksw.com
;
;  If you have any technical questions, please contact our support
;  staff at:
;
;      technical.support@openlinksw.com
;

;
;  Database setup
;
[Database]
DatabaseFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso.db
ErrorLogFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso.log
LockFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso.lck
TransactionFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso.trx
xa_persistent_file		= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso.pxa
ErrorLogLevel			= 7
FileExtend			= 200
MaxCheckpointRemap		= 625000
Striping			= 0
TempStorage			= TempDatabase


[TempDatabase]
DatabaseFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db
TransactionFile			= /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.trx
MaxCheckpointRemap		= 2000
Striping			= 0


;
;  Server parameters
;
[Parameters]
ServerPort			= 1111
LiteMode			= 0
DisableUnixSocket		= 1
DisableTcpSocket		= 0
;SSLServerPort			= 2111
;SSLCertificate			= cert.pem
;SSLPrivateKey			= pk.pem
;X509ClientVerify		= 0
;X509ClientVerifyDepth		= 0
;X509ClientVerifyCAFile		= ca.pem
MaxClientConnections		= 10
CheckpointInterval		= 60
O_DIRECT			= 0
CaseMode			= 2
MaxStaticCursorRows		= 5000
CheckpointAuditTrail		= 0
AllowOSCalls			= 0
SchedulerInterval		= 10
DirsAllowed			= ., /home/swiadmin/virtuoso/share/virtuoso/vad, /home/swiadmin/GVA/download, /home/swiadmin/Downloads
ThreadCleanupInterval		= 0
ThreadThreshold			= 10
ResourcesCleanupInterval	= 0
FreeTextBatchSize		= 100000
SingleCPU			= 0
VADInstallDir			= /home/swiadmin/virtuoso/share/virtuoso/vad/
PrefixResultNames               = 0
RdfFreeTextRulesSize		= 100
IndexTreeMaps			= 256
MaxMemPoolSize                  = 200000000
PrefixResultNames               = 0
MacSpotlight                    = 0
IndexTreeMaps                   = 64
MaxQueryMem 		 	= 2G		; memory allocated to query processor
VectorSize 		 	= 1000		; initial parallel query vector (array of query operations) size
MaxVectorSize 		 	= 1000000	; query vector size threshold.
AdjustVectorSize 	 	= 0
ThreadsPerQuery 	 	= 4
AsyncQueueMaxThreads 	 	= 10 
;;TransactionAfterImageLimit      = 50000000000
;;
;; When running with large data sets, one should configure the Virtuoso
;; process to use between 2/3 to 3/5 of free system memory and to stripe
;; storage on all available disks.
;;
;; Uncomment next two lines if there is 2 GB system memory free
;NumberOfBuffers          = 170000
;MaxDirtyBuffers          = 130000
;; Uncomment next two lines if there is 4 GB system memory free
;NumberOfBuffers          = 340000
; MaxDirtyBuffers          = 250000
;; Uncomment next two lines if there is 8 GB system memory free
;NumberOfBuffers          = 680000
;MaxDirtyBuffers          = 500000
;; Uncomment next two lines if there is 16 GB system memory free
;NumberOfBuffers          = 1360000
;MaxDirtyBuffers          = 1000000
;; Uncomment next two lines if there is 32 GB system memory free
;NumberOfBuffers          = 2720000
;MaxDirtyBuffers          = 2000000
;; Uncomment next two lines if there is 48 GB system memory free
;NumberOfBuffers          = 4000000
;MaxDirtyBuffers          = 3000000
;; Uncomment next two lines if there is 64 GB system memory free
;NumberOfBuffers          = 5450000
;MaxDirtyBuffers          = 4000000
;;
;; Note the default settings will take very little memory
;; but will not result in very good performance
;;
NumberOfBuffers          = 10000
MaxDirtyBuffers          = 6000


[HTTPServer]
ServerPort			= 8890
ServerRoot			= /home/swiadmin/virtuoso/var/lib/virtuoso/vsp
MaxClientConnections		= 10
DavRoot				= DAV
EnabledDavVSP			= 0
HTTPProxyEnabled		= 0
TempASPXDir			= 0
DefaultMailServer		= localhost:25
ServerThreads			= 10
MaxKeepAlives			= 10
KeepAliveTimeout		= 10
MaxCachedProxyConnections	= 10
ProxyConnectionCacheTimeout	= 15
HTTPThreadSize			= 280000
HttpPrintWarningsInOutput	= 0
Charset				= UTF-8
;HTTPLogFile		        = logs/http.log
MaintenancePage             	= atomic.html
EnabledGzipContent          	= 1


[AutoRepair]
BadParentLinks			= 0

[Client]
SQL_PREFETCH_ROWS		= 100
SQL_PREFETCH_BYTES		= 16000
SQL_QUERY_TIMEOUT		= 0
SQL_TXN_TIMEOUT			= 0
;SQL_NO_CHAR_C_ESCAPE		= 1
;SQL_UTF8_EXECS			= 0
;SQL_NO_SYSTEM_TABLES		= 0
;SQL_BINARY_TIMESTAMP		= 1
;SQL_ENCRYPTION_ON_PASSWORD	= -1

[VDB]
ArrayOptimization		= 0
NumArrayParameters		= 10
VDBDisconnectTimeout		= 1000
KeepConnectionOnFixedThread	= 0

[Replication]
ServerName			= db-IP-172-31-22-70
ServerEnable			= 1
QueueMax			= 50000


;
;  Striping setup
;
;  These parameters have only effect when Striping is set to 1 in the
;  [Database] section, in which case the DatabaseFile parameter is ignored.
;
;  With striping, the database is spawned across multiple segments
;  where each segment can have multiple stripes.
;
;  Format of the lines below:
;    Segment<number> = <size>, <stripe file name> [, <stripe file name> .. ]
;
;  <number> must be ordered from 1 up.
;
;  The <size> is the total size of the segment which is equally divided
;  across all stripes forming  the segment. Its specification can be in
;  gigabytes (g), megabytes (m), kilobytes (k) or in database blocks
;  (b, the default)
;
;  Note that the segment size must be a multiple of the database page size
;  which is currently 8k. Also, the segment size must be divisible by the
;  number of stripe files forming  the segment.
;
;  The example below creates a 200 meg database striped on two segments
;  with two stripes of 50 meg and one of 100 meg.
;
;  You can always add more segments to the configuration, but once
;  added, do not change the setup.
;
[Striping]
Segment1			= 100M, db-seg1-1.db, db-seg1-2.db
Segment2			= 100M, db-seg2-1.db
;...

;[TempStriping]
;Segment1			= 100M, db-seg1-1.db, db-seg1-2.db
;Segment2			= 100M, db-seg2-1.db
;...

;[Ucms]
;UcmPath			= <path>
;Ucm1				= <file>
;Ucm2				= <file>
;...


[Zero Config]
ServerName			= virtuoso (IP-172-31-22-70)
;ServerDSN			= ZDSN
;SSLServerName			= 
;SSLServerDSN			= 


[Mono]
;MONO_TRACE			= Off
;MONO_PATH			= <path_here>
;MONO_ROOT			= <path_here>
;MONO_CFG_DIR			= <path_here>
;virtclr.dll			=


[URIQA]
DynamicLocal			= 0
DefaultHost			= localhost:8890


[SPARQL]
;ExternalQuerySource		= 1
;ExternalXsltSource 		= 1
;DefaultGraph      		= http://localhost:8890/dataspace
;ImmutableGraphs    		= http://localhost:8890/dataspace
ResultSetMaxRows           	= 1048576
MaxQueryCostEstimationTime 	= 4000	; in seconds
MaxQueryExecutionTime      	= 60	; in seconds
DefaultQuery               	= select distinct ?Concept where {[] a ?Concept} LIMIT 100
DeferInferenceRulesInit    	= 0  ; controls inference rules loading
;PingService       		= http://rpc.pingthesemanticweb.com/


[Plugins]
LoadPath			= /home/swiadmin/virtuoso/lib/virtuoso/hosting
Load1				= plain, wikiv
Load2				= plain, mediawiki
Load3				= plain, creolewiki
;Load4			= plain, im
;Load5		= plain, wbxml2
;Load6			= plain, hslookup
;Load7			= attach, libphp5.so
;Load8			= Hosting, hosting_php.so
;Load9			= Hosting,hosting_perl.so
;Load10		= Hosting,hosting_python.so
;Load11		= Hosting,hosting_ruby.so
;Load12				= msdtc,msdtc_sample

Below is the virtuoso.log file for the month of May 2022.


		Sun May 01 2022
00:59:26 INFO: Checkpoint started
00:59:26 INFO: Checkpoint finished, log reused
01:59:26 INFO: Checkpoint started
01:59:26 INFO: Checkpoint finished, log reused
02:59:27 INFO: Checkpoint started
02:59:27 INFO: Checkpoint finished, log reused
03:59:27 INFO: Checkpoint started
03:59:27 INFO: Checkpoint finished, log reused
04:59:27 INFO: Checkpoint started
04:59:27 INFO: Checkpoint finished, log reused
05:59:28 INFO: Checkpoint started
05:59:28 INFO: Checkpoint finished, log reused
06:32:20 INFO: Server received signal 15
06:32:20 INFO: Initiating quick shutdown
06:32:20 INFO: Server shutdown complete
06:32:20 INFO: Server received signal 1

		Tue May 03 2022
04:33:59 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:33:59 ERROR:   FAILED  plugin 1: Unable to locate file }
04:33:59 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:33:59 ERROR:   FAILED  plugin 2: Unable to locate file }
04:33:59 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:33:59 ERROR:   FAILED  plugin 3: Unable to locate file }
04:33:59 INFO: OpenLink Virtuoso Universal Server
04:33:59 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
04:33:59 INFO: uses parts of OpenSSL, PCRE, Html Tidy
04:33:59 INFO: Database version 3126
04:33:59 INFO: Unlinked the temp db file /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db as its size (36MB) was greater than TempDBSize INI (10MB)
04:34:00 INFO: SQL Optimizer enabled (max 1000 layouts)
04:34:01 INFO: Compiler unit is timed at 0.000126 msec
04:34:05 INFO: Roll forward started
04:34:05 INFO:     50 transactions, 4338 bytes replayed (100 %)
04:34:05 INFO: Roll forward complete
04:34:06 INFO: Checkpoint started
04:34:06 INFO: Checkpoint finished, log reused
04:34:08 INFO: HTTP/WebDAV server online at 8890
04:34:08 INFO: Server online at 1111 (pid 3950)
05:34:09 INFO: Checkpoint started
05:34:09 INFO: Checkpoint finished, log reused
06:34:09 INFO: Checkpoint started
06:34:09 INFO: Checkpoint finished, log reused
07:34:10 INFO: Checkpoint started
07:34:10 INFO: Checkpoint finished, log reused
08:34:10 INFO: Checkpoint started
08:34:10 INFO: Checkpoint finished, log reused
09:34:12 INFO: Checkpoint started
09:34:12 INFO: Checkpoint finished, log reused
10:34:14 INFO: Checkpoint started
10:34:14 INFO: Checkpoint finished, log reused
11:34:15 INFO: Checkpoint started
11:34:15 INFO: Checkpoint finished, log reused
12:34:15 INFO: Checkpoint started
12:34:15 INFO: Checkpoint finished, log reused
13:34:16 INFO: Checkpoint started
13:34:16 INFO: Checkpoint finished, log reused
14:34:16 INFO: Checkpoint started
14:34:16 INFO: Checkpoint finished, log reused
15:34:16 INFO: Checkpoint started
15:34:16 INFO: Checkpoint finished, log reused
16:34:17 INFO: Checkpoint started
16:34:17 INFO: Checkpoint finished, log reused
17:34:17 INFO: Checkpoint started
17:34:17 INFO: Checkpoint finished, log reused
18:34:18 INFO: Checkpoint started
18:34:18 INFO: Checkpoint finished, log reused
19:34:18 INFO: Checkpoint started
19:34:18 INFO: Checkpoint finished, log reused
20:34:19 INFO: Checkpoint started
20:34:19 INFO: Checkpoint finished, log reused
21:34:19 INFO: Checkpoint started
21:34:19 INFO: Checkpoint finished, log reused
22:34:19 INFO: Checkpoint started
22:34:19 INFO: Checkpoint finished, log reused
23:34:20 INFO: Checkpoint started
23:34:20 INFO: Checkpoint finished, log reused

		Wed May 04 2022
00:34:20 INFO: Checkpoint started
00:34:20 INFO: Checkpoint finished, log reused
01:34:21 INFO: Checkpoint started
01:34:21 INFO: Checkpoint finished, log reused
02:34:21 INFO: Checkpoint started
02:34:21 INFO: Checkpoint finished, log reused
03:34:21 INFO: Checkpoint started
03:34:21 INFO: Checkpoint finished, log reused
04:34:22 INFO: Checkpoint started
04:34:22 INFO: Checkpoint finished, log reused
05:34:23 INFO: Checkpoint started
05:34:23 INFO: Checkpoint finished, log reused
06:34:23 INFO: Checkpoint started
06:34:23 INFO: Checkpoint finished, log reused
07:34:23 INFO: Checkpoint started
07:34:23 INFO: Checkpoint finished, log reused
08:34:24 INFO: Checkpoint started
08:34:24 INFO: Checkpoint finished, log reused
09:34:24 INFO: Checkpoint started
09:34:24 INFO: Checkpoint finished, log reused
10:34:25 INFO: Checkpoint started
10:34:25 INFO: Checkpoint finished, log reused
11:34:25 INFO: Checkpoint started
11:34:25 INFO: Checkpoint finished, log reused
12:34:25 INFO: Checkpoint started
12:34:26 INFO: Checkpoint finished, log reused
13:34:26 INFO: Checkpoint started
13:34:26 INFO: Checkpoint finished, log reused
14:34:26 INFO: Checkpoint started
14:34:26 INFO: Checkpoint finished, log reused
15:34:27 INFO: Checkpoint started
15:34:27 INFO: Checkpoint finished, log reused
16:34:27 INFO: Checkpoint started
16:34:27 INFO: Checkpoint finished, log reused
17:34:28 INFO: Checkpoint started
17:34:28 INFO: Checkpoint finished, log reused
18:34:28 INFO: Checkpoint started
18:34:28 INFO: Checkpoint finished, log reused
19:34:29 INFO: Checkpoint started
19:34:29 INFO: Checkpoint finished, log reused
20:34:29 INFO: Checkpoint started
20:34:29 INFO: Checkpoint finished, log reused
21:34:30 INFO: Checkpoint started
21:34:30 INFO: Checkpoint finished, log reused
22:34:30 INFO: Checkpoint started
22:34:30 INFO: Checkpoint finished, log reused
23:34:31 INFO: Checkpoint started
23:34:31 INFO: Checkpoint finished, log reused

		Thu May 05 2022
00:34:31 INFO: Checkpoint started
00:34:31 INFO: Checkpoint finished, log reused
01:34:32 INFO: Checkpoint started
01:34:32 INFO: Checkpoint finished, log reused
02:34:32 INFO: Checkpoint started
02:34:32 INFO: Checkpoint finished, log reused
03:34:32 INFO: Checkpoint started
03:34:32 INFO: Checkpoint finished, log reused
04:34:33 INFO: Checkpoint started
04:34:33 INFO: Checkpoint finished, log reused
05:34:33 INFO: Checkpoint started
05:34:33 INFO: Checkpoint finished, log reused
06:34:35 INFO: Checkpoint started
06:34:35 INFO: Checkpoint finished, log reused
07:34:35 INFO: Checkpoint started
07:34:35 INFO: Checkpoint finished, log reused
08:34:35 INFO: Checkpoint started
08:34:35 INFO: Checkpoint finished, log reused
09:34:36 INFO: Checkpoint started
09:34:36 INFO: Checkpoint finished, log reused
10:34:36 INFO: Checkpoint started
10:34:36 INFO: Checkpoint finished, log reused
11:34:37 INFO: Checkpoint started
11:34:37 INFO: Checkpoint finished, log reused
12:34:37 INFO: Checkpoint started
12:34:37 INFO: Checkpoint finished, log reused
13:34:37 INFO: Checkpoint started
13:34:38 INFO: Checkpoint finished, log reused
14:34:38 INFO: Checkpoint started
14:34:38 INFO: Checkpoint finished, log reused
15:34:38 INFO: Checkpoint started
15:34:38 INFO: Checkpoint finished, log reused
16:34:39 INFO: Checkpoint started
16:34:39 INFO: Checkpoint finished, log reused
17:34:39 INFO: Checkpoint started
17:34:39 INFO: Checkpoint finished, log reused
18:34:39 INFO: Checkpoint started
18:34:40 INFO: Checkpoint finished, log reused
19:34:40 INFO: Checkpoint started
19:34:40 INFO: Checkpoint finished, log reused
20:34:40 INFO: Checkpoint started
20:34:40 INFO: Checkpoint finished, log reused
21:34:41 INFO: Checkpoint started
21:34:41 INFO: Checkpoint finished, log reused
22:34:41 INFO: Checkpoint started
22:34:41 INFO: Checkpoint finished, log reused
23:34:41 INFO: Checkpoint started
23:34:42 INFO: Checkpoint finished, log reused

		Fri May 06 2022
00:34:42 INFO: Checkpoint started
00:34:42 INFO: Checkpoint finished, log reused
01:34:42 INFO: Checkpoint started
01:34:42 INFO: Checkpoint finished, log reused
02:34:43 INFO: Checkpoint started
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03:34:43 INFO: Checkpoint started
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07:34:45 INFO: Checkpoint started
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08:34:46 INFO: Checkpoint started
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09:34:46 INFO: Checkpoint started
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10:34:47 INFO: Checkpoint started
10:34:47 INFO: Checkpoint finished, log reused
11:34:47 INFO: Checkpoint started
11:34:47 INFO: Checkpoint finished, log reused
12:34:48 INFO: Checkpoint started
12:34:48 INFO: Checkpoint finished, log reused
13:34:48 INFO: Checkpoint started
13:34:48 INFO: Checkpoint finished, log reused
14:34:48 INFO: Checkpoint started
14:34:48 INFO: Checkpoint finished, log reused
15:34:49 INFO: Checkpoint started
15:34:49 INFO: Checkpoint finished, log reused
16:34:49 INFO: Checkpoint started
16:34:49 INFO: Checkpoint finished, log reused
17:34:49 INFO: Checkpoint started
17:34:49 INFO: Checkpoint finished, log reused
18:34:50 INFO: Checkpoint started
18:34:50 INFO: Checkpoint finished, log reused
19:34:52 INFO: Checkpoint started
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20:34:52 INFO: Checkpoint started
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21:34:52 INFO: Checkpoint started
21:34:52 INFO: Checkpoint finished, log reused
22:34:53 INFO: Checkpoint started
22:34:53 INFO: Checkpoint finished, log reused
23:34:53 INFO: Checkpoint started
23:34:53 INFO: Checkpoint finished, log reused

		Sat May 07 2022
00:34:54 INFO: Checkpoint started
00:34:54 INFO: Checkpoint finished, log reused
01:34:56 INFO: Checkpoint started
01:34:57 INFO: Checkpoint finished, log reused
02:34:57 INFO: Checkpoint started
02:34:57 INFO: Checkpoint finished, log reused
03:34:57 INFO: Checkpoint started
03:34:57 INFO: Checkpoint finished, log reused
04:34:58 INFO: Checkpoint started
04:34:58 INFO: Checkpoint finished, log reused
05:35:00 INFO: Checkpoint started
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06:35:00 INFO: Checkpoint started
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07:35:00 INFO: Checkpoint started
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08:35:01 INFO: Checkpoint started
08:35:01 INFO: Checkpoint finished, log reused
09:35:01 INFO: Checkpoint started
09:35:01 INFO: Checkpoint finished, log reused
10:35:02 INFO: Checkpoint started
10:35:02 INFO: Checkpoint finished, log reused
11:35:02 INFO: Checkpoint started
11:35:02 INFO: Checkpoint finished, log reused
12:35:03 INFO: Checkpoint started
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13:35:03 INFO: Checkpoint started
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14:35:03 INFO: Checkpoint started
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15:35:04 INFO: Checkpoint started
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16:35:04 INFO: Checkpoint started
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17:35:06 INFO: Checkpoint started
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18:35:06 INFO: Checkpoint started
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19:35:07 INFO: Checkpoint started
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20:35:07 INFO: Checkpoint started
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21:35:08 INFO: Checkpoint started
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22:35:08 INFO: Checkpoint started
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23:35:09 INFO: Checkpoint started
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		Sun May 08 2022
00:35:09 INFO: Checkpoint started
00:35:09 INFO: Checkpoint finished, log reused
01:35:09 INFO: Checkpoint started
01:35:09 INFO: Checkpoint finished, log reused
02:35:10 INFO: Checkpoint started
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03:35:10 INFO: Checkpoint started
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04:35:11 INFO: Checkpoint started
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05:35:11 INFO: Checkpoint started
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06:35:12 INFO: Checkpoint started
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07:35:12 INFO: Checkpoint started
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08:35:12 INFO: Checkpoint started
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09:35:13 INFO: Checkpoint started
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10:35:13 INFO: Checkpoint started
10:35:13 INFO: Checkpoint finished, log reused
11:35:14 INFO: Checkpoint started
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12:35:14 INFO: Checkpoint started
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13:35:14 INFO: Checkpoint started
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14:35:16 INFO: Checkpoint started
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15:35:17 INFO: Checkpoint started
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16:35:17 INFO: Checkpoint started
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17:35:18 INFO: Checkpoint started
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18:35:18 INFO: Checkpoint started
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19:35:19 INFO: Checkpoint started
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20:35:19 INFO: Checkpoint started
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21:35:19 INFO: Checkpoint started
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22:35:20 INFO: Checkpoint started
22:35:20 INFO: Checkpoint finished, log reused
23:35:20 INFO: Checkpoint started
23:35:20 INFO: Checkpoint finished, log reused

		Mon May 09 2022
00:35:21 INFO: Checkpoint started
00:35:22 INFO: Checkpoint finished, log reused
01:35:22 INFO: Checkpoint started
01:35:22 INFO: Checkpoint finished, log reused
02:35:22 INFO: Checkpoint started
02:35:22 INFO: Checkpoint finished, log reused
03:35:23 INFO: Checkpoint started
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04:35:23 INFO: Checkpoint started
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05:35:24 INFO: Checkpoint started
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06:35:26 INFO: Checkpoint started
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07:35:27 INFO: Checkpoint started
07:35:27 INFO: Checkpoint finished, log reused
08:35:27 INFO: Checkpoint started
08:35:27 INFO: Checkpoint finished, log reused
09:35:28 INFO: Checkpoint started
09:35:28 INFO: Checkpoint finished, log reused
10:35:28 INFO: Checkpoint started
10:35:28 INFO: Checkpoint finished, log reused
11:35:28 INFO: Checkpoint started
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12:35:28 INFO: Checkpoint started
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13:35:30 INFO: Checkpoint started
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14:35:30 INFO: Checkpoint started
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15:35:31 INFO: Checkpoint started
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16:35:31 INFO: Checkpoint started
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17:35:32 INFO: Checkpoint started
17:35:32 INFO: Checkpoint finished, log reused
18:35:34 INFO: Checkpoint started
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19:35:34 INFO: Checkpoint started
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20:35:35 INFO: Checkpoint started
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21:35:35 INFO: Checkpoint started
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22:35:35 INFO: Checkpoint started
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23:35:36 INFO: Checkpoint started
23:35:36 INFO: Checkpoint finished, log reused

		Tue May 10 2022
00:35:36 INFO: Checkpoint started
00:35:36 INFO: Checkpoint finished, log reused
01:35:37 INFO: Checkpoint started
01:35:37 INFO: Checkpoint finished, log reused
02:35:37 INFO: Checkpoint started
02:35:37 INFO: Checkpoint finished, log reused
03:35:37 INFO: Checkpoint started
03:35:37 INFO: Checkpoint finished, log reused
04:35:39 INFO: Checkpoint started
04:35:39 INFO: Checkpoint finished, log reused
05:35:40 INFO: Checkpoint started
05:35:40 INFO: Checkpoint finished, log reused
06:35:40 INFO: Checkpoint started
06:35:40 INFO: Checkpoint finished, log reused
07:01:06 INFO: Server received signal 15
07:01:06 INFO: Server received signal 1
07:01:06 INFO: Initiating quick shutdown
07:01:06 INFO: Server shutdown complete

		Tue May 10 2022
07:23:00 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
07:23:00 ERROR:   FAILED  plugin 1: Unable to locate file }
07:23:00 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
07:23:00 ERROR:   FAILED  plugin 2: Unable to locate file }
07:23:00 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
07:23:00 ERROR:   FAILED  plugin 3: Unable to locate file }
07:23:00 INFO: OpenLink Virtuoso Universal Server
07:23:00 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
07:23:00 INFO: uses parts of OpenSSL, PCRE, Html Tidy
07:23:00 INFO: Database version 3126
07:23:00 INFO: Unlinked the temp db file /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db as its size (32MB) was greater than TempDBSize INI (10MB)
07:23:01 INFO: SQL Optimizer enabled (max 1000 layouts)
07:23:02 INFO: Compiler unit is timed at 0.000126 msec
07:23:06 INFO: Roll forward started
07:23:06 INFO:     50 transactions, 4338 bytes replayed (100 %)
07:23:06 INFO: Roll forward complete
07:23:07 INFO: Checkpoint started
07:23:07 INFO: Checkpoint finished, log reused
07:23:07 INFO: HTTP/WebDAV server online at 8890
07:23:07 INFO: Server online at 1111 (pid 3460)
08:23:08 INFO: Checkpoint started
08:23:08 INFO: Checkpoint finished, log reused
09:00:42 INFO: Server received signal 2
09:00:42 INFO: Initiating normal shutdown
09:00:43 INFO: Checkpoint started
09:00:43 INFO: Checkpoint finished, log reused
09:00:43 INFO: Server shutdown complete

		Tue May 10 2022
09:01:12 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:01:12 ERROR:   FAILED  plugin 1: Unable to locate file }
09:01:12 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:01:12 ERROR:   FAILED  plugin 2: Unable to locate file }
09:01:12 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:01:12 ERROR:   FAILED  plugin 3: Unable to locate file }
09:01:12 INFO: OpenLink Virtuoso Universal Server
09:01:12 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
09:01:12 INFO: uses parts of OpenSSL, PCRE, Html Tidy
09:01:12 INFO: Database version 3126
09:01:12 INFO: Unlinked the temp db file /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db as its size (32MB) was greater than TempDBSize INI (10MB)
09:01:12 INFO: SQL Optimizer enabled (max 1000 layouts)
09:01:14 INFO: Compiler unit is timed at 0.000127 msec
09:01:17 INFO: Roll forward started
09:01:17 INFO: Roll forward complete
09:01:18 INFO: Checkpoint started
09:01:18 INFO: Checkpoint finished, log reused
09:01:18 INFO: HTTP/WebDAV server online at 8890
09:01:18 INFO: Server online at 1111 (pid 10595)
09:26:33 INFO: Server received signal 15
09:26:33 INFO: Initiating quick shutdown
09:26:33 INFO: Server shutdown complete

		Tue May 10 2022
09:30:49 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:30:49 ERROR:   FAILED  plugin 1: Unable to locate file }
09:30:49 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:30:49 ERROR:   FAILED  plugin 2: Unable to locate file }
09:30:49 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
09:30:49 ERROR:   FAILED  plugin 3: Unable to locate file }
09:30:49 INFO: OpenLink Virtuoso Universal Server
09:30:49 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
09:30:49 INFO: uses parts of OpenSSL, PCRE, Html Tidy
09:30:49 INFO: Database version 3126
09:30:49 INFO: SQL Optimizer enabled (max 1000 layouts)
09:30:50 INFO: Compiler unit is timed at 0.000127 msec
09:30:54 INFO: Roll forward started
09:30:54 INFO:     39 transactions, 19904 bytes replayed (100 %)
09:30:54 INFO: Roll forward complete
09:30:56 INFO: Checkpoint started
09:30:56 INFO: Checkpoint finished, log reused
09:30:58 INFO: HTTP/WebDAV server online at 8890
09:30:58 INFO: Server online at 1111 (pid 3090)
10:31:00 INFO: Checkpoint started
10:31:00 INFO: Checkpoint finished, log reused
11:31:01 INFO: Checkpoint started
11:31:02 INFO: Checkpoint finished, log reused
12:31:03 INFO: Checkpoint started
12:31:03 INFO: Checkpoint finished, log reused
13:31:04 INFO: Checkpoint started
13:31:04 INFO: Checkpoint finished, log reused
14:31:05 INFO: Checkpoint started
14:31:05 INFO: Checkpoint finished, log reused
15:31:06 INFO: Checkpoint started
15:31:06 INFO: Checkpoint finished, log reused
16:31:08 INFO: Checkpoint started
16:31:08 INFO: Checkpoint finished, log reused
17:31:09 INFO: Checkpoint started
17:31:09 INFO: Checkpoint finished, log reused
18:31:09 INFO: Checkpoint started
18:31:09 INFO: Checkpoint finished, log reused
19:31:10 INFO: Checkpoint started
19:31:10 INFO: Checkpoint finished, log reused
20:31:10 INFO: Checkpoint started
20:31:10 INFO: Checkpoint finished, log reused
21:31:11 INFO: Checkpoint started
21:31:11 INFO: Checkpoint finished, log reused
22:31:11 INFO: Checkpoint started
22:31:11 INFO: Checkpoint finished, log reused
23:31:12 INFO: Checkpoint started
23:31:12 INFO: Checkpoint finished, log reused

		Wed May 11 2022
00:31:12 INFO: Checkpoint started
00:31:12 INFO: Checkpoint finished, log reused
01:31:13 INFO: Checkpoint started
01:31:13 INFO: Checkpoint finished, log reused
02:31:13 INFO: Checkpoint started
02:31:13 INFO: Checkpoint finished, log reused
03:31:14 INFO: Checkpoint started
03:31:14 INFO: Checkpoint finished, log reused
04:03:41 INFO: Server received signal 15
04:03:41 INFO: Initiating quick shutdown
04:03:41 INFO: Server shutdown complete

		Wed May 11 2022
04:06:26 INFO: { Loading plugin 1: Type `plain', file `wikiv' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 1: Unable to locate file }
04:06:26 INFO: { Loading plugin 2: Type `plain', file `mediawiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 2: Unable to locate file }
04:06:26 INFO: { Loading plugin 3: Type `plain', file `creolewiki' in `/home/swiadmin/virtuoso/lib/virtuoso/hosting'
04:06:26 ERROR:   FAILED  plugin 3: Unable to locate file }
04:06:26 INFO: OpenLink Virtuoso Universal Server
04:06:26 INFO: Version 07.20.3215-pthreads for Linux as of Dec 18 2020
04:06:26 INFO: uses parts of OpenSSL, PCRE, Html Tidy
04:06:26 INFO: Database version 3126
04:06:26 INFO: Unlinked the temp db file /home/swiadmin/virtuoso/var/lib/virtuoso/db/virtuoso-temp.db as its size (34MB) was greater than TempDBSize INI (10MB)
04:06:26 INFO: SQL Optimizer enabled (max 1000 layouts)
04:06:27 INFO: Compiler unit is timed at 0.000126 msec
04:06:32 INFO: Roll forward started
04:06:32 INFO:     63 transactions, 5493 bytes replayed (100 %)
04:06:32 INFO: Roll forward complete
04:06:32 INFO: Checkpoint started
04:06:32 INFO: Checkpoint finished, log reused
04:06:34 INFO: HTTP/WebDAV server online at 8890
04:06:34 INFO: Server online at 1111 (pid 3039)
04:59:49 WARNING: * Monitor: High disk read (1)
05:06:35 INFO: Checkpoint started
05:06:35 INFO: Checkpoint finished, log reused
06:06:37 INFO: Checkpoint started
06:06:37 INFO: Checkpoint finished, log reused
07:06:37 INFO: Checkpoint started
07:06:37 INFO: Checkpoint finished, log reused
08:06:40 INFO: Checkpoint started
08:06:40 INFO: Checkpoint finished, log reused
09:06:41 INFO: Checkpoint started
09:06:41 INFO: Checkpoint finished, log reused
10:06:42 INFO: Checkpoint started
10:06:43 INFO: Checkpoint finished, log reused
11:06:44 INFO: Checkpoint started
11:06:44 INFO: Checkpoint finished, log reused
12:06:45 INFO: Checkpoint started
12:06:45 INFO: Checkpoint finished, log reused
13:06:46 INFO: Checkpoint started
13:06:46 INFO: Checkpoint finished, log reused
14:06:47 INFO: Checkpoint started
14:06:47 INFO: Checkpoint finished, log reused
15:06:47 INFO: Checkpoint started
15:06:48 INFO: Checkpoint finished, log reused
16:06:48 INFO: Checkpoint started
16:06:48 INFO: Checkpoint finished, log reused
17:06:48 INFO: Checkpoint started
17:06:48 INFO: Checkpoint finished, log reused
18:06:49 INFO: Checkpoint started
18:06:49 INFO: Checkpoint finished, log reused
19:06:49 INFO: Checkpoint started
19:06:49 INFO: Checkpoint finished, log reused
20:06:50 INFO: Checkpoint started
20:06:50 INFO: Checkpoint finished, log reused
21:06:50 INFO: Checkpoint started
21:06:50 INFO: Checkpoint finished, log reused
22:06:50 INFO: Checkpoint started
22:06:51 INFO: Checkpoint finished, log reused
23:06:51 INFO: Checkpoint started
23:06:51 INFO: Checkpoint finished, log reused

		Thu May 12 2022
00:06:51 INFO: Checkpoint started
00:06:51 INFO: Checkpoint finished, log reused
01:06:53 INFO: Checkpoint started
01:06:53 INFO: Checkpoint finished, log reused
02:06:53 INFO: Checkpoint started
02:06:53 INFO: Checkpoint finished, log reused
03:06:54 INFO: Checkpoint started
03:06:54 INFO: Checkpoint finished, log reused
04:06:54 INFO: Checkpoint started
04:06:54 INFO: Checkpoint finished, log reused
05:06:55 INFO: Checkpoint started
05:06:55 INFO: Checkpoint finished, log reused
06:06:56 INFO: Checkpoint started
06:06:56 INFO: Checkpoint finished, log reused
07:06:57 INFO: Checkpoint started
07:06:57 INFO: Checkpoint finished, log reused
08:06:57 INFO: Checkpoint started
08:06:57 INFO: Checkpoint finished, log reused
09:06:58 INFO: Checkpoint started
09:06:58 INFO: Checkpoint finished, log reused
10:07:00 INFO: Checkpoint started
10:07:00 INFO: Checkpoint finished, log reused
11:07:00 INFO: Checkpoint started
11:07:00 INFO: Checkpoint finished, log reused
12:07:00 INFO: Checkpoint started
12:07:00 INFO: Checkpoint finished, log reused
13:07:01 INFO: Checkpoint started
13:07:01 INFO: Checkpoint finished, log reused
14:07:01 INFO: Checkpoint started
14:07:01 INFO: Checkpoint finished, log reused
15:07:02 INFO: Checkpoint started
15:07:02 INFO: Checkpoint finished, log reused
16:07:03 INFO: Checkpoint started
16:07:03 INFO: Checkpoint finished, log reused
17:07:04 INFO: Checkpoint started
17:07:04 INFO: Checkpoint finished, log reused
18:07:04 INFO: Checkpoint started
18:07:04 INFO: Checkpoint finished, log reused
19:07:05 INFO: Checkpoint started
19:07:05 INFO: Checkpoint finished, log reused
20:07:05 INFO: Checkpoint started
20:07:05 INFO: Checkpoint finished, log reused
21:07:05 INFO: Checkpoint started
21:07:05 INFO: Checkpoint finished, log reused
22:07:06 INFO: Checkpoint started
22:07:06 INFO: Checkpoint finished, log reused
23:07:06 INFO: Checkpoint started
23:07:06 INFO: Checkpoint finished, log reused

		Fri May 13 2022
00:07:07 INFO: Checkpoint started
00:07:07 INFO: Checkpoint finished, log reused
01:07:07 INFO: Checkpoint started
01:07:07 INFO: Checkpoint finished, log reused
02:07:08 INFO: Checkpoint started
02:07:08 INFO: Checkpoint finished, log reused
03:07:08 INFO: Checkpoint started
03:07:08 INFO: Checkpoint finished, log reused
04:07:08 INFO: Checkpoint started
04:07:08 INFO: Checkpoint finished, log reused

Regards,
Gopi

How are you actually running this query, is it via your Virtuoso SPARQL endpoint (ie ~/sparql) ?

As by default the Virtuoso SPARQL endpoint form page has the Strict checking of void variables option checked, and if I run your query against one of our Virtuoso open source endpoints like the one we host for Wikidata, I get the same error, even without having any of your data, as can be seem here.

So you need on uncheck the Strict checking of void variables option on the SPARQL endpoint form page before running the query for it to run.

Also, how many triples are in the Virtuoso instance, as checking the INI file provided it does not appear the Virtuoso instance has been Performance Tuned, as the NumberOfBuffer param is still set to the 10000 default value. Meaning there will be very little of the system memory allocated to Virtuoso for hosting the database working set, which if large will result in poor performance as the data needs to be swapped to and from disk. Thus you should tune instance as detailed in the document.