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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2990) ResultSet.getBlob holds locks even with READ_UNCOMMITTED isolation level
Date Thu, 02 Aug 2007 23:55:52 GMT
ResultSet.getBlob holds locks even with READ_UNCOMMITTED isolation level
------------------------------------------------------------------------

                 Key: DERBY-2990
                 URL: https://issues.apache.org/jira/browse/DERBY-2990
             Project: Derby
          Issue Type: Bug
          Components: JDBC
    Affects Versions: 10.2.2.0, 10.1.3.1, 10.3.1.4, 10.4.0.0
            Reporter: Kathey Marsden
         Attachments: GetBlobLocks.java

ResultSet.getBlob() holds locks even when isolation level is set to TRANSACTION_READ_UNCOMMITTED.
  See attached repro

 java GetBlobLocks
Exception in thread "main" ERROR 40XL1: A lock could not be obtained within the time requested
        at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
        at org.apache.derby.impl.services.locks.LockSet.lockObject(Unknown Source)
        at org.apache.derby.impl.services.locks.SinglePool.lockAnObject(Unknown Source)
        at org.apache.derby.impl.services.locks.SinglePool.lockObject(Unknown Source)
        at org.apache.derby.impl.store.raw.xact.RowLocking3.lockRecordForWrite(Unknown Source)
        at org.apache.derby.impl.store.access.conglomerate.OpenConglomerate.lockPositionForWrite(Unknown
Source)
        at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.delete(Unknown
Source)
        at org.apache.derby.impl.sql.execute.RowChangerImpl.deleteRow(Unknown Source)
        at org.apache.derby.impl.sql.execute.DeleteResultSet.collectAffectedRows(Unknown Source)
        at org.apache.derby.impl.sql.execute.DeleteResultSet.open(Unknown Source)
        at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedStatement.executeUpdate(Unknown Source)
        at GetBlobLocks.testBlobLocks(GetBlobLocks.java:46)
        at GetBlobLocks.main(GetBlobLocks.java:11)
[C:/kmarsden/repro/getblob] echo $WS

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