July 2019 Blog Posts (6)

Group Buffer Pool - Changes by PH13045

Level setting:

A Db2 group buffer pool (GBP) consist of two parts:

1) Directory entries

2) Data entries

For each data entry there must be an associated directory entry in the GBP.

A directory entry can exist without a data entry in the…

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Added by Peter Hartmann on July 30, 2019 at 12:27 — 2 Comments

Function level V12R1M504 and e.g. archive tables

V12R1M504:

With APPLCOMPAT V12R1M504 on e.g. SPUFI or DSNTEP2, one can no longer create segmented or classic partitioned table spaces. See knowledge center for this restriction.

A small marginalia is behind this restriction, if this is combined with another…

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Added by Peter Hartmann on July 19, 2019 at 9:57 — No Comments

RUNSTATS sampling enhancements

Introduction:

One of the major challenges for RUNSTATS is the sampling of the data rows e.g. for calculation of the COLCARD value in SYSIBM.SYSCOLSTATS and SYSIBM.SYSCOLUMNS.



The challenge is to balance the CPU resources used by RUNSTATS to calculate column cardinalities with high accuracy…

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Added by Peter Hartmann on July 17, 2019 at 10:38 — 1 Comment

Retrieval of current DSNZPARM and DSNHDECP settings

History:

With DB2 Version 9.1 for z/OS a new system supplied stored procedure SYSPROC.ADMIN_INFO_SYSPARM was delivered. As the name suggests, this routine can be called to obtain the current settings of the Db2 subsystem parameters (DSNZPARM) and the…

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Added by Peter Hartmann on July 16, 2019 at 8:04 — 6 Comments

Transferring ownership of Db2 objects in Db2 12

In Db2 12, you can transfer the ownership of database and system objects online if you are the owner of the object or have SECADM authority. You can use TRANSFER OWNERSHIP statements to transfer ownership of an objects to another authorization ID or a role, without any application changes.

For the full story on this new SQL capability, see the new Db2 12 GA feature series post, Transferring ownership of Db2…

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Added by Paul McWilliams on July 12, 2019 at 22:38 — No Comments

Asynchronous cross-invalidation (XI) for coupling facility (CF) cache structures, e.g. Db2 for z/OS group buffer pools (GBP)

Description of the new feature:

When Db2 in a data sharing environment writes a changed page to the GBP the same page in the buffer pool(s) of the other member(s) must be invalidated to avoid back level data access in this/these member(s). This invalidation is done by the cross invalidation (XI) feature which is a key functionality of data sharing and controlled by coupling facility…

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Added by Peter Hartmann on July 12, 2019 at 7:57 — No Comments

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IDUG Db2 Tech Conference coming to San Paulo, Brazil and Mexico City! Register Now

Started by Surekha Parekh in What's hot ? on Thursday. 0 Replies

For the first time IDUG is hosting two events in Latin America. These seminars will bring together Db2 professionals from around the world for expert-led technical sessions and networking opportunities. This is your chance to connect! …Continue

Tags: Education

MSSQL linked server attaching to DB2 LUW

Started by Mike Jett in Application Development and DB2 on Thursday. 0 Replies

I am trying to create a linked server from MSSQL 2014  to DB2 11.1  I am able to create one linked server and get it to work with one DB.  I have not been able to figure out how to add additional catalogs(DB's).  Is it possible to use just one…Continue

Tags: server, linked

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