IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 956

Deadlock between 2 Inserts because of Pseudo Deletes

We recently ran into deadlocks issue while doing QA tests for a major application delivery, our DB2 traces revealed that the deadlocks were always between 2 inserts, what we did not understand was why there was a S lock (on a ROW/PAGE) in deadlock...
over 5 years ago in Db2 for z/OS 0 Not under consideration

ODBC connections to z/DB2 should be z/IIP offloaded like JDBC

ODBC connections to DB2 should be offloadable to z/IIP engines in the same way that JDBC connections are. It seems that ODBC has been left behind in this way. This would enhance the abilities of IBM products like FTM on the z platform.
over 7 years ago in Db2 for z/OS 0 Not under consideration

SQLCODE -327 reporting

SQLCA and GET DIAGNOSTICS do not include the impacted table name when reporting SQLCODE -327. The table experiencing the issue has to be found in the subsystem... manually.
over 7 years ago in Db2 for z/OS 0 Not under consideration

Temporal Logical Transactions - code transparency

Temporal support for system time is being enhanced in DB2 12 to support logical transactions. However the implementation chosen requires that applications that will explore this feature is being recoded.
over 7 years ago in Db2 for z/OS 0 Not under consideration

Add EXPLAINABLE column to DSN_STATEMENT_CACHE_TABLE

Currently, some unEXPLAINable statements are captured into DSN_STATEMENT_CACHE_TABLE when user does EXPLAIN STMTCACHE ALL. e.g. UPDATE / DELETE statement with positional update:UPDATE T1 set C1=? WHERE CURRENT OF CURSOR001; It would be nice if the...
about 8 years ago in Db2 for z/OS 0 Not under consideration

"INDEX ONLY" index scan should be used instead of tablespace scan when it performs better.

We were analyzing the optimization of the following query: SELECT MAX(A.COL1) FROM MY_TABLE A WHERE A.COL2= ? WITH UR ; There is an index that exists for MY_TABLE that has a first column of COL1 and a second column of COL2. DB2 was using a tablesp...
about 8 years ago in Db2 for z/OS 1 Not under consideration

Implement XQuery functions present in DB2 LUW but missing in DB2 for z/OS

Quite a lot of XQuery functions that are implemented in DB2 LUW, are missing in DB2 for z/OS. Many of them are very useful, and should be implemented in DB2 for z/OS as well. Here is the complete list (39 functions). We are specifically missing th...
about 8 years ago in Db2 for z/OS 0 Not under consideration

Externalize performance t...

I have a performance trace running requesting IFCIDS 58 (END), 59 (FETCH), 65(OPEN), 66(CLOSE). I run the following Cobol program: ID DIVISION. PROGRAM-ID. C011MAIN. ENVIRONMENT DIVISION. DATA DIVISION. WORKING-STORAGE SECTION. 77 FILLER PIC X(12)...
about 8 years ago in Db2 for z/OS 1 Not under consideration

Always drop indexes related to unique constraints

When dropping a unique constraint or a primary key that has been defined on a table in an explicit (universal) table space in DB2 10 NFM, the related index is not dropped if the index was explicitly created too. However, when the index or the tabl...
about 8 years ago in Db2 for z/OS 1 Not under consideration

Enhance use of Function Based Index when SQL function is used in right hand side in the predicate

Please refer to Service request number 23178,057,649
over 8 years ago in Db2 for z/OS 2 Not under consideration

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