SDTMEMLIMIT
The SDTMEMLIMIT system initialization parameter specifies a limit to the amount of storage above the bar that is available for shared data tables to use for control information (entry descriptors, backout elements, and index nodes). The default is 4 GB. When you set this parameter, check your current setting for the z/OS MEMLIMIT parameter.
Important: You can specify an amount of storage in the range 1 through 524288 MB (512
GB), but this amount must not be greater than 40% of the z/OS MEMLIMIT value.
MEMLIMIT limits the amount of 64-bit storage that the CICS address space can
use. If you set SDTMEMLIMIT to a value greater than 40% of the
MEMLIMIT value, message DFHFC0418 is issued and CICS
terminates.
For information about the MEMLIMIT value for CICS and instructions to check the MEMLIMIT value that currently applies to the CICS region, see Estimating and checking MEMLIMIT. For information about the z/OS MEMLIMIT parameter, see Limiting the use of private memory objects in the z/OS MVS Programming: Extended Addressability Guide.
- SDTMEMLIMIT={4G|nnnnnnM|nnnG}
- Valid values are as follows:
- 4G
- The default amount of storage above the bar that is available for shared data tables to use.
- nnnnnnM
- Specifies an amount of storage above the bar, in megabytes, that is available for shared data tables to use. It can have a value in the range 1 through 524288 MB.
- nnnG
- Specifies an amount of storage above the bar, in gigabytes, that is available for shared data tables to use. It can have a value in the range 1 through 512 GB.