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https://issues.apache.org/jira/browse/DERBY-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054327#comment-13054327
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Knut Anders Hatlen commented on DERBY-4275:
-------------------------------------------
During SYSCS_COMPRESS_TABLE we invalidate dependent statements three times, and
all of them happen before any changes have been made to the data dictionary.
With the patch, this is changed to two invalidations before the DD changes and
one after the DD is updated.
The first two invalidations are done by the general alter table machinery. The
compress table implementation was moved into alter table in 10.5 (DERBY-1062).
It may be that the earlier invalidation was needed before that change, but now
that we have the alter table machinery doing early invalidation in any case,
the bug mentioned in the comments (bug 3653) is probably handled even if we
move the compress-specific invalidation after the data dictionary changes.
> Query executions fail when compressing a table using
> SYSCS_UTIL.SYSCS_COMPRESS_ TABLE
> -------------------------------------------------------------------------------------
>
> Key: DERBY-4275
> URL: https://issues.apache.org/jira/browse/DERBY-4275
> Project: Derby
> Issue Type: Bug
> Components: Store
> Affects Versions: 10.4.1.3
> Reporter: Sai Pullabhotla
> Assignee: Knut Anders Hatlen
> Labels: derby_triage10_5_2
> Attachments: CompressDBTest1.java, CompressDBTest2.java,
> invalidate-after.diff
>
>
> Query executions (SELECT and/or UPDATE) fail with serious exceptions while
> the table is being compressed using SYSCS_UTIL.SYSCS_COMPRESS_ TABLE. The
> compression eventually finishes normally, but the queries keep failing with
> the same error until the database is rebooted. More information about this
> can be found on the Derby mailing list at
> http://www.nabble.com/Issue-with-SYSCS_UTIL.SYSCS_COMPRESS_-TABLE-td23892893.html.
> The exception stacktrace is below:
> Caused by: java.sql.SQLException: The conglomerate (71,409) requested does
> not exist.
> at
> org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
> at
> org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
> at
> org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
> at
> org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown
> Source)
> at
> org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeQuery(Unknown Source)
> at
> org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
> ... 25 more
> Caused by: ERROR XSAI2: The conglomerate (71,409) requested does not
> exist.
> at
> org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
> at
> org.apache.derby.impl.store.access.btree.index.B2IFactory.readConglomerate(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.RAMAccessManager.conglomCacheFind(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.RAMTransaction.findExistingConglomerate(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.RAMTransaction.openScan(Unknown Source)
> at
> org.apache.derby.impl.store.access.BackingStoreHashTableFromScan.<init>(Unknown
> Source)
> at
> org.apache.derby.impl.store.access.RAMTransaction.createBackingStoreHashtableFromScan(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.HashScanResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.JoinResultSet.openRight(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.UnionResultSet.getNextRowCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.SortResultSet.getRowFromResultSet(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.SortResultSet.getNextRowFromRS(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.SortResultSet.loadSorter(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
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