IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 985

Performant SQL Windowing functionality

We tried to use the syntax for windowing in SQL as an alternative to using subselects. Most other DBMSs perform a lot better with the windowing syntax, but we can only see less performance using it. The reason we want to use it is basically to get...
over 6 years ago in Db2 for z/OS 0 Not under consideration

Optimization access paths currently used for SELECTs should also apply to UPDATEs (and DELETEs)

Currently, as I write a SELECT query with a correlated Sub-select (and no other predicates), I see that the optimization for that query uses a non-correlated sub-select and the query runs very fast. But, if I use exactly the same predicate, but wr...
over 4 years ago in Db2 for z/OS 1 Not under consideration

Row Change Timesatmp with Precision 12 and Timezone

Row change timestamp is sensitive to changing from daylight savings time to standard time since it doesn't support TIMESTAMP WITH TIMEZONE and other precisions than 6.Applications have two requirements that could be combined and solved by the row ...
about 11 years ago in Db2 for z/OS 1 Not under consideration

zDb2 should provide option to not write RACF statistics without coding any Db2 Signon Exit (DSN3SSGN)

Banca d'Italia, for many good reasons, wants to get rid of any user written assembler exit, including DSN3SSGN .They use DNS3SSGN only with the specific purpose to not collect RACF statistics and so they have modified it by adding STAT=NO on each ...
over 6 years ago in Db2 for z/OS 1 Not under consideration

Index on expression should be used when outer join is rewritten (by the optimizer) as an inner join

When coding the following query (or, generalized query), an index on expression for UPPER(RTRIM(TABB.COLA)) is not used: SELECT ... FROM .... TABA LEFT JOIN TABB ON .... WHERE UPPER(RTRIM(TABB.COLA)) = ? In the above query, it is (originally) writ...
almost 7 years ago in Db2 for z/OS 1 Not under consideration

Regular Expressions (regex) scalar function

The XMLQUERY function allows the user to use the 'fn:matches' XQuery function, which is great. Please see example UDF which does this... ~~~~~~~~~~--#SET TERMINATOR ! CREATE FUNCTION "UDF_STRING_REGEX_MATCH" ( SEARCHSTRING VARCHAR (50) ) RETURNS S...
about 9 years ago in Db2 for z/OS 0 Not under consideration

402 VLDB - DB2 Zparm with Variable Options

DB2 Zparm with Variable Options We have a large number of DB2's to maintain.Most of the DB2's run with the same Zparm values except for the following:-Catalog HLQ, IRLM name, ARC HLQ, Member ID, Data sharing detail and DDF detail. If these values ...
about 9 years ago in Db2 for z/OS 1 Not under consideration

"DBRM load module cross-reference feature" be incorporate into Db2 Administration Tool

As of April 30th, of 2020, IBM Db2 Bind Manager got  'end of service' and would not be supported anymore. Some Bind Manager Function were integrated to the IBM Db2 Administration Tool v12.1 but "DBRM load module cross-reference fea...
over 4 years ago in Db2 for z/OS 2 Not under consideration

Expand RETPD in template to 5 digits

RETPD parm in the template should allow 5 digits with a value up to 93000
almost 7 years ago in Db2 for z/OS 0 Not under consideration

Column name isn't allowed after LIKE

SQL that does select * from xxx where 'value' like col1fails.
over 11 years ago in Db2 for z/OS 1 Not under consideration

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