This parameter determines the size of the compression window or history buffer. This memory is above the 16 megabyte line. The valid values are 8–15. The default is 13. Size 8 uses 1 KB of memory, whereas Size 15 requires 128 KB of memory.

Compression consumes significant CPU resources. For more information, see the caution for the parameter, ECZ.COMPRESSION.LEVEL = 1 | n.

Modifiable through MODIFY INITPARMS command: YES