CA ADS Runtime System › Managing Storage › Writing Resources to Scratch Records

Writing Resources to Scratch Records

Writing resources to scratch records during a pseudo-converse removes the resources from storage pools while the resources are not in use. This strategy is appropriate when storage pool resources are tight.

The following strategies are available to site administrators:

• Define a fast mode threshold. The fast mode threshold is the point at which the CA ADS runtime system writes CA ADS record buffer blocks (RBBs) and statistics control blocks to the scratch area (DDLDCSCR) across a pseudo-converse. If the total size of the RBBs and statistics control blocks in all storage pools exceed the fast mode threshold, the system writes the RBBs and statistics control blocks to scratch. To define fast mode threshold, specify the threshold and also that resources are relocatable in the system generation ADSO statement.

  Resources must be fixed in order for the fast mode threshold to have any effect. When resources are relocatable then RBBs always go to the scratch area.

• Define a relocatable threshold for one or more storage pools. The relocatable threshold is the point at which the DC/UCF system writes relocatable storage to the scratch area (DDLDCSCR) across a pseudo-converse.

  When this option is in effect, CA ADS storage is always written to scratch across a pseudo-converse.

Relocatable Resources

The following are relocatable resources:

• CA ADS terminal block (OTB)
• CA ADS terminal block extension (OTB ext)
• HELP maps
• Menu stack
• Variable dialog blocks (VDBs)

Relocating storage makes more efficient use of the storage pool but increases I/O to the scratch area. You should define a threshold so that the system relocates storage only when the storage pool is heavily used.

System Generation Statement

Use the system generation ADSO statement to indicate whether resources are relocatable. Use the RELOCATABLE THRESHOLD parameter of the system generation SYSTEM statement to specify the relocatable threshold for storage pool zero. For secondary storage pools, use the RELOCATABLE THRESHOLD parameter of the corresponding system generation STORAGE POOL or XA STORAGE POOL statement.

Note: For more information about the ADSO and SYSTEM statements, see the CA IDMS System Generation Guide.