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https://issues.apache.org/jira/browse/DERBY-6665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063414#comment-14063414
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Knut Anders Hatlen commented on DERBY-6665:
-------------------------------------------
Conglomerate sharing also causes problems if a FOREIGN KEY constraint and a
UNIQUE/PRIMARY KEY constraint share one physical conglomerate.
See for example this transcript, where the deferred uniqueness check was not
performed on commit:
{noformat}
ij version 10.11
ij> connect 'jdbc:derby:memory:db;create=true';
ij> create table t1(x int primary key);
0 rows inserted/updated/deleted
ij> create table t2(x int primary key initially deferred references t1
initially deferred);
0 rows inserted/updated/deleted
ij> insert into t1 values 1;
1 row inserted/updated/deleted
ij> autocommit off;
ij> insert into t2 values 3;
1 row inserted/updated/deleted
ij> insert into t2 values 3;
1 row inserted/updated/deleted
ij> insert into t1 values 3;
1 row inserted/updated/deleted
ij> commit;
ij> select * from t1;
X
-----------
1
3
2 rows selected
ij> select * from t2;
X
-----------
3
3
2 rows selected
{noformat}
The commit statement should have failed because T2 contained duplicates in its
primary key column.
> Violation of deferred foreign key not detected on commit
> --------------------------------------------------------
>
> Key: DERBY-6665
> URL: https://issues.apache.org/jira/browse/DERBY-6665
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.11.0.0
> Reporter: Knut Anders Hatlen
>
> See the following script:
> {noformat}
> ij version 10.11
> ij> connect 'jdbc:derby:memory:db;create=true';
> ij> create table t1(x int primary key);
> 0 rows inserted/updated/deleted
> ij> create table t2(x int primary key);
> 0 rows inserted/updated/deleted
> ij> create table t3(x int, constraint fk1 foreign key (x) references t1
> initially deferred, constraint fk2 foreign key (x) references t2 initially
> deferred);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values 1;
> 1 row inserted/updated/deleted
> ij> autocommit off;
> ij> insert into t3 values 1;
> 1 row inserted/updated/deleted
> ij> insert into t2 values 1;
> 1 row inserted/updated/deleted
> ij> delete from t1;
> 1 row inserted/updated/deleted
> ij> commit;
> ij> select * from t1;
> X
> -----------
> 0 rows selected
> ij> select * from t2;
> X
> -----------
> 1
> 1 row selected
> ij> select * from t3;
> X
> -----------
> 1
> 1 row selected
> {noformat}
> Since T3.X contains a value (1) that is not present in T1, the foreign key
> FK1 is violated, and the COMMIT statement should have failed.
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