IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 982

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.
about 8 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...
over 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...
over 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...
over 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)...
almost 9 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...
almost 9 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
almost 9 years ago in Db2 for z/OS 2 Not under consideration

Unnecessary package invalidation

We are attempting to revoke PUBLIC authorization to rearrange DB2 security policy. Customer think PUBLIC is not suitable in nowadays security environment. But we face unnecessary package invalidation when we test for this.
about 9 years ago in Db2 for z/OS 1 Not under consideration

Query rewrite eliminating "always true" and "always false" predicates

We would like DB2 to be able to rewrite dynamic SQL statements that contain parameter markers by eliminating "always true" and "always false" predicates once it knows the values of the parameter markers. It often happens that such predicates are n...
over 9 years ago in Db2 for z/OS 0 Not under consideration

Concatenation of Timestamps not possible in DB2 for z/OS

This SQL runs in DB2 LUW but not in DB2 z/OS: WITH CTEREVUR AS( SELECT OID, CREATEDBY, CREATEDAT, NAME, VALIDTO, VALIDFROM, UPDATEACTION, REPLACEDAT, TIMESTAMP_FORMAT(VALIDFROM, 'YYYY-MM-DD') || TIMESTAMP_FORMAT(VALIDTO, 'YYYY-MM-DD') AS COMBINE F...
over 9 years ago in Db2 for z/OS 1 Not under consideration

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