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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5120) Row from SYSDEPENDS gets deleted when a table has update triggers defined on it and an upate is made to the table
Date Fri, 08 Jul 2011 18:41:16 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13062104#comment-13062104
] 

Mamta A. Satoor commented on DERBY-5120:
----------------------------------------

Rick, I was planning to keep my focus on just maintaining the dependency that was originally
intended for trigger. At the create trigger time, we add the dependency between trigger action
and trigger table. We loose that during trigger recompile. I think this fix will be real easy
by having SPSDescriptor add this dependency info rather than create trigger do it. This will
take care of both create trigger and trigger action recompile because of invalidity. Let me
know if you, Dag or anyone else have any feedback on moving the trigger action -> trigger
table dependency to SPSDescriptor from Create Trigger. Thanks

I agree that some of these dependencies can probably be established programmatically rather
than SYSDEPENDS having to carry it. But I will like that work to go as part of the new jira
DERBY-5323.

> Row from SYSDEPENDS gets deleted when a table has update triggers defined on it and an
upate is made to the table
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5120
>                 URL: https://issues.apache.org/jira/browse/DERBY-5120
>             Project: Derby
>          Issue Type: Task
>          Components: SQL
>    Affects Versions: 10.2.2.0, 10.8.1.2
>            Reporter: Mamta A. Satoor
>            Assignee: Mamta A. Satoor
>
> I have an ij script below which shows that the number of rows in SYSDEPENDS go down by
1 for the following test case after an update is made to a table with update triggers defined
on it. Am not sure what kind of problems the missing dependnecy might cause.
> connect 'jdbc:derby:c:/dellater/db1;create=true';
> CREATE TABLE ATDC_13_TAB1(c11 int, c12 int);
> insert into ATDC_13_TAB1 values (1,11);
> create table ATDC_13_TAB2(c21 int, c22 int);
> insert into ATDC_13_TAB2 values (1,11);
> create table ATDC_13_TAB3(c31 int, c32 int);
> insert into ATDC_13_TAB3 values (1,11);
> create table ATDC_13_TAB1_backup(c11 int, c12 int);
> insert into ATDC_13_TAB1_backup values (1,11);
>                 create trigger ATDC_13_TAB1_trigger_1 after update 
>                 on ATDC_13_TAB1 for each row mode db2sql 
>                 INSERT INTO ATDC_13_TAB1_BACKUP(C11) 
>                 SELECT C21 from ATDC_13_TAB2;
>                  create trigger ATDC_13_TAB1_trigger_2 after update 
>                 on ATDC_13_TAB1 for each row mode db2sql 
>                 INSERT INTO ATDC_13_TAB1_BACKUP 
>                  SELECT C31, C32 from ATDC_13_TAB3;
> -- following shows 14 rows
> select * from sys.sysdepends;
> update ATDC_13_TAB1 set c12=11;
> -- following shows only 13 rows
> I tried this on 10.2 and 10.8 and saw the same behavior on both. It seems like the dependency
that gets dropped is between the stored prepared statement and a table. Have not spent enough
time to find out more details but I thought it is worth pointing out the behavior
> select * from sys.sysdepends;

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