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Status Under review
Workspace Db2 for z/OS
Created by Guest
Created on Oct 14, 2025

RELATED IDEAS

Change Db2 Load And Db2 Reorg To Selectively Ignore KEEPDICTIONARY

Change Db2 Load and Db2 Reorg to ignore KEEPDICTIONARY if the tablespace part is currently compressed and
* SYSTABLEPART.COMPRESS IN ('F','H') & SYSTABLEPART.COMPRESS <> SYSTABLEPART.COMPRESS_USED
          OR    
* SYSTABLEPART.COMPRESS = 'Y' & zParm TS_COMPRESSION_TYPE <> SYSTABLEPART.COMPRESS_USED

For TS parts using Fixed Compression and that have Loads/Reorgs with KEEPDICTIONARY,  to covert the TS parts from Fixed to Huffman Compression the following has to be done:
1) Change the desired Compression algorithm (ALTER of TS/TS part or change zParm) 
2) Change the utility to remove KEEPDICTIONARY
3) Run the utility to switch compression algorithms
4) Change the utility to add KEEPDICTIONARY

In big Production environments 100s or 1000s of utilities would have to be changed twice to switch all TSs from Fixed to Huffman Compression.

With the proposed changes,  for TS parts using Fixed Compression and that have Loads/Reorgs with KEEPDICTIONARY, to covert the TS parts from Fixed to Huffman Compression the following would have to be done:
1) Change the desired Compression algorithm (ALTER of TS/TS part or change zParm) 
2) Run the utility to switch compression algorithms

No utility control cards would need to change!  If desired the whole environment could be switched to Huffman compression by simply changing the zParm -- TS/TS parts would switch the next time a load or reorg ran.

 

 

Needed By Yesterday (Let's go already!)

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