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https://issues.apache.org/jira/browse/DERBY-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mamta A. Satoor updated DERBY-5681:
-----------------------------------
Attachment: DERBY5681_patch2_diff.txt
Attaching a patch which fixes the problem associated with this jira. Basically,
when two constraints share the same backing index, we conditionally dropped the
statistics. Instead, this fix will make sure that the statistics are always
dropped even if the underneath backing index is still valid(and hence won't be
dropped and recreated) for other constraints. I ran derbyall and junit suite
and they both ran fine with no errors. Please let me know if there is any
feedback on the patch. I have also added few tests for the issue.
> When a foreign key constraint on a table is dropped, the associated
> statistics row for the conglomerate is not removed
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-5681
> URL: https://issues.apache.org/jira/browse/DERBY-5681
> Project: Derby
> Issue Type: Bug
> Components: SQL, Store
> Affects Versions: 10.8.2.2
> Reporter: Brett Bergquist
> Assignee: Mamta A. Satoor
> Attachments: DERBY5681_patch1_diff.txt, DERBY5681_patch2_diff.txt
>
>
> If you drop the foreign key constraint for a table, the statistics row does
> not get removed. This affects the indexStat daemon because it now finds
> these statistics row which always appear as out of date, causing an update to
> be scheduled.
> Here is how to get it to happen:
> set schema app;
> CREATE TABLE TEST_TAB_1
> (
> ID INTEGER PRIMARY KEY NOT NULL
> );
> CREATE TABLE TEST_TAB_2
> (
> ID INTEGER PRIMARY KEY NOT NULL
> );
> ALTER TABLE TEST_TAB_2
> ADD CONSTRAINT TEST_TAB_2_FK_1
> FOREIGN KEY (ID) REFERENCES TEST_TAB_1(ID);
> insert into app.TEST_TAB_1 values (1);
> insert into test_tab_2 values(1);
> call syscs_util.syscs_update_statistics('APP', 'TEST_TAB_2', null);
> select
> c.TABLEID,
> c.CONGLOMERATENUMBER,
> c.CONGLOMERATENAME,
> c.ISINDEX,
> c.ISCONSTRAINT,
> c.CONGLOMERATEID,
> t.TABLEID,
> t.TABLENAME,
> t.TABLETYPE,
> s.STATID,
> s.REFERENCEID,
> s.TABLEID,
> s.CREATIONTIMESTAMP,
> s.TYPE,
> s.VALID,
> s.COLCOUNT,
> CAST(STATISTICS AS VARCHAR(40)) as STATISTICS
> from sys.SYSCONGLOMERATES c join sys.SYSTABLES t on c.TABLEID = t.TABLEID
> join sys.SYSSTATISTICS s on s.TABLEID = t.TABLEID
> where t.TABLENAME = 'TEST_TAB_2' and c.ISINDEX = false;
> -- At this point there are two statistic rows
> TABLEID CONGLOMERATENUMBER CONGLOMERATENAME ISINDEX ISCONSTRAINT
> CONGLOMERATEID TABLEID TABLENAME TABLETYPE STATID REFERENCEID
> TABLEID CREATIONTIMESTAMP TYPE VALID COLCOUNT STATISTICS
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T edbc8255-0136-6999-c1b4-000065089f97
> 55410238-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.629 I true 1 numunique= 1 numrows= 1
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T 05278254-0136-6999-c1b4-000065089f97
> 63454207-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.628 I true 1 numunique= 1 numrows= 1
> -- Now drop the constraint
> alter table TEST_TAB_2
> drop constraint TEST_TAB_2_FK_1;
> select
> c.TABLEID,
> c.CONGLOMERATENUMBER,
> c.CONGLOMERATENAME,
> c.ISINDEX,
> c.ISCONSTRAINT,
> c.CONGLOMERATEID,
> t.TABLEID,
> t.TABLENAME,
> t.TABLETYPE,
> s.STATID,
> s.REFERENCEID,
> s.TABLEID,
> s.CREATIONTIMESTAMP,
> s.TYPE,
> s.VALID,
> s.COLCOUNT,
> CAST(STATISTICS AS VARCHAR(40)) as STATISTICS
> from sys.SYSCONGLOMERATES c join sys.SYSTABLES t on c.TABLEID = t.TABLEID
> join sys.SYSSTATISTICS s on s.TABLEID = t.TABLEID
> where t.TABLENAME = 'TEST_TAB_2' and c.ISINDEX = false;
> -- There are still two statistic rows
> TABLEID CONGLOMERATENUMBER CONGLOMERATENAME ISINDEX ISCONSTRAINT
> CONGLOMERATEID TABLEID TABLENAME TABLETYPE STATID REFERENCEID
> TABLEID CREATIONTIMESTAMP TYPE VALID COLCOUNT STATISTICS
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T edbc8255-0136-6999-c1b4-000065089f97
> 55410238-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.629 I true 1 numunique= 1 numrows= 1
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T 05278254-0136-6999-c1b4-000065089f97
> 63454207-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.628 I true 1 numunique= 1 numrows= 1
> -- Add another row
> insert into app.TEST_TAB_1 values (2);
> insert into test_tab_2 values(2);
> -- Update the statistics
> call syscs_util.syscs_update_statistics('APP', 'TEST_TAB_2', null);
> select
> c.TABLEID,
> c.CONGLOMERATENUMBER,
> c.CONGLOMERATENAME,
> c.ISINDEX,
> c.ISCONSTRAINT,
> c.CONGLOMERATEID,
> t.TABLEID,
> t.TABLENAME,
> t.TABLETYPE,
> s.STATID,
> s.REFERENCEID,
> s.TABLEID,
> s.CREATIONTIMESTAMP,
> s.TYPE,
> s.VALID,
> s.COLCOUNT,
> CAST(STATISTICS AS VARCHAR(40)) as STATISTICS
> from sys.SYSCONGLOMERATES c join sys.SYSTABLES t on c.TABLEID = t.TABLEID
> join sys.SYSSTATISTICS s on s.TABLEID = t.TABLEID
> where t.TABLENAME = 'TEST_TAB_2' and c.ISINDEX = false;
> -- There are still two rows but now one show 1 row and one shows 2 rows
> TABLEID CONGLOMERATENUMBER CONGLOMERATENAME ISINDEX ISCONSTRAINT
> CONGLOMERATEID TABLEID TABLENAME TABLETYPE STATID REFERENCEID
> TABLEID CREATIONTIMESTAMP TYPE VALID COLCOUNT STATISTICS
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T edbc8255-0136-6999-c1b4-000065089f97
> 55410238-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.629 I true 1 numunique= 1 numrows= 1
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T 18438274-0136-6999-c1b4-000065089f97
> 63454207-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:41:19.164 I true 1 numunique= 2 numrows= 2
> -- Add the constraint back on
> ALTER TABLE TEST_TAB_2
> ADD CONSTRAINT TEST_TAB_2_FK_1
> FOREIGN KEY (ID) REFERENCES TEST_TAB_1(ID);
> -- Insert another row
> insert into app.TEST_TAB_1 values (3);
> insert into test_tab_2 values(3);
> -- Update the statistics
> call syscs_util.syscs_update_statistics('APP', 'TEST_TAB_2', null);
> select
> c.TABLEID,
> c.CONGLOMERATENUMBER,
> c.CONGLOMERATENAME,
> c.ISINDEX,
> c.ISCONSTRAINT,
> c.CONGLOMERATEID,
> t.TABLEID,
> t.TABLENAME,
> t.TABLETYPE,
> s.STATID,
> s.REFERENCEID,
> s.TABLEID,
> s.CREATIONTIMESTAMP,
> s.TYPE,
> s.VALID,
> s.COLCOUNT,
> CAST(STATISTICS AS VARCHAR(40)) as STATISTICS
> from sys.SYSCONGLOMERATES c join sys.SYSTABLES t on c.TABLEID = t.TABLEID
> join sys.SYSSTATISTICS s on s.TABLEID = t.TABLEID
> where t.TABLENAME = 'TEST_TAB_2' and c.ISINDEX = false;
> -- Now there are 3 rows
> TABLEID CONGLOMERATENUMBER CONGLOMERATENAME ISINDEX ISCONSTRAINT
> CONGLOMERATEID TABLEID TABLENAME TABLETYPE STATID REFERENCEID
> TABLEID CREATIONTIMESTAMP TYPE VALID COLCOUNT STATISTICS
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T edbc8255-0136-6999-c1b4-000065089f97
> 55410238-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:36:49.629 I true 1 numunique= 1 numrows= 1
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T 45eb02e8-0136-6999-c1b4-000065089f97
> 63454207-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:46:00.211 I true 1 numunique= 3 numrows= 3
> 84490209-0136-6999-c1b4-000065089f97 348432
> 84490209-0136-6999-c1b4-000065089f97 false false
> cccb420a-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> TEST_TAB_2 T 0ea502e9-0136-6999-c1b4-000065089f97
> 7ab90278-0136-6999-c1b4-000065089f97 84490209-0136-6999-c1b4-000065089f97
> 2012-03-31 17:46:00.212 I true 1 numunique= 3 numrows= 3
> Note that dropping that recreating the constraint or compressing the table
> does not fix the problem.
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