Defining Fast Path DEDB buffer pools for single-area structures

This topic describes control statements in the DFSVSMxx member that you use to define Fast Path DEDB buffer pools for single-area structures.

Control statements for defining Fast Path DEDB buffer pools for single-area structures

The format of the control statements for defining a Fast Path buffer pool for a single-area structure is:

Read syntax diagramSkip visual syntax diagramDEDB= ,(poolname,cisize,pbuf,sbuf,maxbuf,LKASID,NOLKASID,dbdname)

Parameter descriptions for defining Fast Path DEDB buffer pools for single-area structures

DEDB=
Is the required keyword for defining Fast Path buffer pools. It must be in the first position of the control statement.
poolname
The one- to eight-character name for the pool. The poolname is used as identification on display terminals and reports.
cisize
A three- to five-digit number specifying the size of the pool. All the standard DEDB supported buffer sizes are supported. You can express sizes numerically or as standard CI sizes: 1K, 2K, 4K.
pbuf
The primary buffer allocation. Specify a value from 1 to 32766.
sbuf
The secondary buffer allocation. Specify a value from 1 to 9999. This secondary allocation is used when the primary allocation runs low.
maxbuf
The maximum number of buffers allowed for this pool. It is a combination of PBUF plus some iteration of SBUF. The maximum value allowed is 32767. If maxbuf is specified greater than 32767, it defaults to 32767.
LKASID │ NOLKASID
Specifies whether buffer lookaside is to be performed on read requests for this area.

For VSO DEDB areas that use a single-area structure, this parameter is required. The value that is specified by using the INIT.DBDS or CHANGE.DBDS DBRC command is the default value. The value that is defined in the RECON data set for the area by using one of the DBRC commands takes precedence over the value defined in the DFSVSMxx PROCLIB member.

dbdname
Associates a pool to a specific area or DBD. If dbdname is an area name, then the pool is used only by that area. If dbdname is a DBD name, then the pool is used by all the areas within that DBD.