SYSCS_COMPRESS_TABLE fails to aquire exclusive table lock
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Key: DERBY-3683
URL: https://issues.apache.org/jira/browse/DERBY-3683
Project: Derby
Issue Type: Bug
Affects Versions: 10.4.1.3
Environment: Embedded Derby, Sun JDK 1.6.0_06-b02, Linux
2.6.9-67.0.15.EL i686
Reporter: Juha Heljoranta
Priority: Minor
Derby documentation about SYSCS_COMPRESS_TABLE says: "...procedure acquires an
exclusive table lock on the table being compressed." However, I get:
java.sql.SQLException: The exception 'java.sql.SQLException: A lock could not
be obtained due to a deadlock, cycle of locks and waiters is:
Lock : ROW, SYSCONGLOMERATES, (7,16)
Waiting XID : {13091, X} , APP, alter table "APP"."XYZ" compress sequential
Granted XID : {13091, S} , {13087, S}
Lock : TABLE, XYZ, Tablelock
Waiting XID : {13087, IX} , APP, update XYZ set FOO = ? where BAR = ? AND ID
= ?
Granted XID : {13091, X}
. The selected victim is XID : 13091.' was thrown while evaluating an
expression.
if another thread is updating the same table while another thread executes:
CallableStatement cs = conn.prepareCall("CALL
SYSCS_UTIL.SYSCS_COMPRESS_TABLE(?, ?, ?)");
cs.setString(1, "APP");
cs.setString(2, "XYZ");
cs.setShort(3, (short) 1);
cs.execute();
conn.commit();
Problem goes away if I acquire exclusive table lock manually right before the
compress table statement:
conn.prepareStatement("LOCK TABLE XYZ IN EXCLUSIVE MODE").executeUpdate();
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