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https://issues.apache.org/jira/browse/DERBY-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13277040#comment-13277040
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Mamta A. Satoor commented on DERBY-5681:
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Have backported the changes to 10.4 but in trunk , for this jira, we added some
tests which use upgrade statistics procedure but since that procedure doesn't
exist in 10.4 and before, they couldn't be backported to 10.4 without changes.
In 10.4, I added those tests to a new class, namely Derby5681Test.java without
using update statisitcs procedure. But, because of the absence of update
statisitcs procedure and DERBY-5702, we can't quite have a statistics row for a
constraint which shares a backing index in 10.4 and before. The test in 10.4
will just have a test to drop constraint(that shares a backing index with
another constraint) and show that it doesn't break anything. Once DERBY-5702 is
fixed and backported to 10.4 and before, we will have a statistics row for a
constraint which shares a backing index and we will be able to show that as a
fix of this jira, that statistics row will get dropped when the constraint is
dropped.
> 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
> Fix For: 10.4.2.1, 10.5.3.2, 10.6.2.3, 10.7.1.4, 10.8.2.3,
> 10.9.0.0
>
> 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 these statistics row which always appear as out of date, causing an update to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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