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Status Is a defect
Workspace Db2 for z/OS
Created by Guest
Created on May 21, 2021

Return SQL error when DBA attempts ALTER DDL with both pending and immediate changes, instead of returning "0" and "losing" a change.

We recently opened an SR TS005591497 with support when we found that an ALTER to a LOB tablespace specifying both PRIQTY and COMPRESS returned SQLCODE 0, but the PRIQTY was "lost".

IBM support pointed out the following:

Restrictions on ALTER TABLESPACE statements that cause pending changes:

ALTER TABLESPACE statements that cause pending changes have the following restrictions:

  • Options that cause pending changes cannot be specified with options that take effect immediately

  • Options that cause pending changes cannot be specified for the following objects:

    • The catalog

    • System objects

    • Objects in a workfile database

An ALTER of PRIQTY is an immediate ALTER but the ALTER of COMPRESS is a pending alter and is not complete until a REORG is run. So when combined, the ALTER of PRIQTY is ignored. In this case, the ALTER of COMPRESS and PRIQTY should be done in separate DDL statements.

Though this is documented, it is doubtful most DBAs have reviewed the DOC that thoroughly. Since this action did not return a negative SQLcode, most DBAs would proceed under the assumption that the mixed DDL "took", and may not discover PRIQTY was lost until much later.

The DBAs need to be prompted to examine the documentation if they make an error in DDL such as this...I suggest a negative SQLcode be returned instead of allowing the operation to proceed.

Needed by Date Aug 31, 2021
  • Admin
    Janet Figone
    Jun 1, 2021

    Hello Mark,

    Development has reviewed this issue and determined that it is a defect. Please reopen your case or open a new case reporting the issue and stating such and request that an APAR be created for the problem.


    Db2 for z/OS Development