virtuoso.trx) is empty before performing any of the following updates/upgrades.
This is easily done by launching Virtuoso with the extra command-line argument, "+checkpoint-only".
Virtuoso will launch, replay the transaction log, run a checkpoint (which zeroes the transaction log), and exit cleanly.
.trx file, typically found alongside the .db and .ini files.+checkpoint-only", and recheck .trx file size -- expecting zero bytes.
.trx files persist, contact Technical Support.
.trx file, typically found alongside the .db and .ini files.+checkpoint-only", and recheck .trx file size -- expecting zero bytes.
.trx files persist, contact Technical Support.RDF_QUAD table used for RDF Data storage.The database format did not change between various versions of Virtuoso 6.1.x, so from a database standpoint no particular steps need to be performed before upgrading to a newer version of Virtuoso 6.1.x.
However, you must properly clear the transaction logs prior to installing the newer binaries, as they may otherwise have a different version tag. In such case, the Virtuoso server will print a message like the following, and refuse to launch:
The transaction log file has been produced by server version '06.01.xxxx'. The version of this server is '06.01.yyyy'. If the transaction log is empty or you do not want to replay it then delete it and start the server again. Otherwise replay the log using the server of version '06.01.xxxx' and make checkpoint and shutdown to ensure that the log is empty, then delete it and start using new version.
In Virtuoso versions before 6.1.4, some RDF data in the quad store could be stored in a way that could break the sequence of an index, causing wrong results to be passed back.
We have addressed this by adding an automated check into 6.1.4 (and later) to detect whether this condition is present, and to fix the index when needed.
The first time a Release 6.1.3 or earlier database is started with a Release 6.1.4 or later binary, the following text will appear in the Virtuoso session log:
21:05:36 PL LOG: This database may contain RDF data that could cause indexing problems on previous versions of the server. 21:05:36 PL LOG: The content of the DB.DBA.RDF_QUAD table will be checked and an update may automatically be performed if 21:05:36 PL LOG: such data is found. 21:05:36 PL LOG: This check will take some time but is made only once.
As the message says, this check may take some time, depending on the number of stored quads.
If the check succeeds, Virtuoso will mark the check as "done" within the database file, so it will not affect subsequent restarts of the instance, and the following message will be entered in the log:
21:05:36 PL LOG: No need to update DB.DBA.RDF_QUAD
The database will continue to perform the startup routines and go into an online state.
If the condition is detected, however, the following message will appear in the log, and the Virtuoso server will refuse to start --
21:05:36 PL LOG: An update is required. 21:05:36 PL LOG: 21:05:36 PL LOG: NOTICE: Before Virtuoso can continue fixing the DB.DBA.RDF_QUAD table and its indexes 21:05:36 PL LOG: the DB Administrator should check make sure that: 21:05:36 PL LOG: 21:05:36 PL LOG: * there is a recent backup of the database 21:05:36 PL LOG: * there is enough free disk space available to complete this conversion 21:05:36 PL LOG: * the database can be offline for the duration of this conversion 21:05:36 PL LOG: 21:05:36 PL LOG: Since the update can take a considerable amount of time on large databases 21:05:36 PL LOG: it is advisable to schedule this at an appropriate time. 21:05:36 PL LOG: 21:05:36 PL LOG: To continue the DBA must change the virtuoso.ini file and add the following flag: 21:05:36 PL LOG: 21:05:36 PL LOG: [Parameters] 21:05:36 PL LOG: AnalyzeFixQuadStore = 1 21:05:36 PL LOG: 21:05:36 PL LOG: For additional information please contact OpenLink Support <support@openlinksw.com> 21:05:36 PL LOG: This process will now exit.
Since the update will take a substantial amount of time and additional disk space depending on the size of the quad store, we do not automatically start the update process. Instead, we hand control back to you, and let you decide when to perform this update. If you want to delay the update, you should restart with the older binary, as the new binary will never launch with this database.
Once you have checked the backups and disk space, and found an appropriate time-slot to run this update, you should edit the virtuoso.ini file and add the following flag:
[Parameters] AnalyzeFixQuadStore = 1
Upon starting the Virtuoso server, the following messages will appear in the virtuoso.log file:
21:05:57 PL LOG: This database may contain RDF data that could cause indexing problems on previous versions of the server. 21:05:57 PL LOG: The content of the DB.DBA.RDF_QUAD table will be checked and an update may automatically be performed if 21:05:57 PL LOG: such data is found. 21:05:57 PL LOG: This check will take some time but is made only once. 21:05:57 PL LOG: 21:05:57 PL LOG: An update is required. 21:05:57 PL LOG: Please be patient. 21:05:57 PL LOG: The table DB.DBA.RDF_QUAD and two of its additional indexes will now be patched. 21:05:57 PL LOG: In case of an error during the operation, delete the transaction log before restarting the server. 21:05:57 Checkpoint started 21:05:57 Checkpoint finished, log off 21:05:57 PL LOG: Phase 1 of 9: Gathering statistics ... 21:05:58 PL LOG: * Index sizes before the processing: 002565531 RDF_QUAD, 002565531 POGS, 001171100 OP 21:05:58 PL LOG: Phase 2 of 9: Copying all quads to a temporary table ... 21:07:26 PL LOG: * Index sizes of temporary table: 001171100 OP 21:07:26 PL LOG: Phase 3 of 9: Cleaning the quad storage ... 21:07:51 PL LOG: Phase 4 of 9: Refilling the quad storage from the temporary table... 21:09:17 PL LOG: Phase 5 of 9: Cleaning the temporary table ... 21:09:41 PL LOG: Phase 6 of 9: Gathering statistics again ... 21:09:41 PL LOG: * Index sizes after the processing: 002565531 RDF_QUAD, 002565531 POGS, 001171100 OP 21:09:41 PL LOG: Phase 7 of 9: integrity check (completeness of index RDF_QUAD_POGS of DB.DBA.RDF_QUAD) ... 21:10:00 PL LOG: Phase 8 of 9: integrity check (completeness of primary key of DB.DBA.RDF_QUAD) ... 21:10:17 PL LOG: Phase 9 of 9: final checkpoint... 21:10:20 Checkpoint started 21:10:22 Checkpoint finished, log off 21:10:22 PL LOG: Update complete.
If the update process detects any problem, it will put some debug output into the virtuoso.log and exit.
At this point, you are advised to remove the virtuoso.trx file and contact OpenLink Support.
When the update process completes successfully, the database is left in an online state.
The database file format has not changed, but the introduction of a newer RDF index requires you run a script to upgrade the RDF_QUAD table.
Since this can be a lengthy task and take extra disk space (up to twice the space used by the original RDF_QUAD table may be required during conversion) this is not done automatically on startup.
After upgrading the binary, you cannot perform any SPARQL queries until the new RDF_QUAD table is installed.
The steps for this are:
.trx file is empty.RDF_QUAD table.virtuoso.ini and disable [HTTPServer] section for duration of the upgrade.isql to your database and run the libsrc/Wi/clrdf23.sql script.
Depending on the number of quad records this can take several hours. Once the conversion is complete, the database will shut itself down.virtuoso.ini and re-enable the [HTTPServer] section.
If you attempt to use a Virtuoso 5.x database file with a Virtuoso 6.1.x or later server, the server will refuse to launch, with a message like that below:
The database you are opening was last closed with a server of version xxxx. The present server is of version yyyy. This server does not read this pre-6.0 format.
The database file format has changed substantially between Virtuoso 5.x and Virtuoso 6.x. To upgrade your database, you must dump all data from the Virtuoso 5.x database and re-load it into Virtuoso 6.x.
Regular Virtuoso 5.x RDBMS tables can be dumped with the dbdump tool, producing scripts that can be replayed using the isql tool.
For the Virtuoso 5.x RDF_QUAD table, we have a set of stored procedures that will dump graphs into a set of backup files, which can then be reloaded into the Virtuoso 6.x database.
Contact us at <vos.admin@openlinksw.com> for more info.
For best results, also download the latest VAD archives for your new version of Enterprise Edition or Open Source Edition Virtuoso version.
The database format did not change between various versions of Virtuoso 5.x, so from a database standpoint no particular steps need to be performed before upgrading to a newer version of Virtuoso 5.
The only requirement is that you must properly shut down the database prior to installing the latest binaries, as the transaction logs will otherwise have a different version tag. In such case, the Virtuoso server will print a message like the following, and refuse to launch:
The transaction log file has been produced by server version '05.00.xxxx'. The version of this server is '05.00.yyyy'. If the transaction log is empty or you do not want to replay it then delete it and start the server again. Otherwise replay the log using the server of version '05.00.xxxx' and make checkpoint and shutdown to ensure that the log is empty, then delete it and start using new version.
If you have Virtuoso Release 4.x or earlier, with or without ODS, preserving your data while upgrading your installation and databases to Release 5.x or later requires the steps described below.
Important: To upgrade from Release 4.x or earlier to Release 6.x or later, you must first perform an incremental upgrade to Release 5.x; then, upgrade from Release 5.x to current.If you do not have any old data, you can skip this process, and simply use the new demo database, which has all the current ODS applications pre-installed.
dba with isql and execute:
SQL> dav_replicate_all_to_rdf_quad (1);
To upgrade the ODS applications and preserve any data you may have in them, do the following:
/share/virtuoso/vad/ directory in the tree where make install copies the results of the build; for Commercial Edition, they are found in the vad directory.
Updated VAD packages can be downloaded for both Enterprise Edition and Open Source Edition.isql:
SQL> vad_install('ods_framework_dav.vad', 0);