DFSFDRxx member of the IMS PROCLIB data set

Use the DFSFDRxx member of IMS PROCLIB data set to specify the Fast Database Recovery (FDBR) options used by the FDR.

Multiple DFSFDRxx members can be present in the IMS PROCLIB data set. The FDRMBR= parameter in the FDR, IMS, or DBC procedure identifies the member currently in effect.

Environments

This member is applicable to the FDBR region and the FDBR-capable IMS or DBC regions.

Syntax

Usage

The record format is

Position: Contents
1-71: Option parameters separated by commas
72-80: Ignored

The first parameter in a record can have leading blanks. The last parameter in a record is denoted by a comma, followed by one or more blanks. The last parameter in the last record is followed by one or more blanks.

Parameters can occur in any order in the control statement. Multiple control statements can be provided.

Both the 64-bit pools and non-resident 31-bit pools in IMS active systems and their associated FDBR and XRF alternate systems should have identical contents. Whatever parameters and values you specify on the active IMS system should be the same on the alternate IMS system. For example, the parameters specified in the DFSVSMxx, DFSDFxxx, and DFSPBxxx members of the IMS PROCLIB data set must be the same; the sizes of the PSB and DMB pools must be the same.

Parameters

ACTIVEIMSID=

Specifies the IMS ID for the subsystem that the active FDBR region tracks. For IMS and DBC procedures (FDBR capable regions), ACTIVEIMSID must match the IMS ID defined in the procedure. This parameter is required.

AREA01=

Specifies whether Fast DB Recovery applies to DEDB areas defined as SHARELVL= 0|1. This parameter applies to FDR procedures. IMS and DBC procedures ignore it if it is specified.

RECOV: Specifies that Fast DB Recovery applies to SHARELVL= 0|1 areas.
NORECOV: Specifies that SHARELVL= 0|1 areas are not recovered by FDBR. Succeeding IMS emergency restarts recover the areas after FDBR completion.
The default is NORECOV.

FPBUFF=

Specifies where the control blocks for DEDB processing are allocated. This keyword is optional. If you do not specify this parameter, control blocks for DEDB processing are allocated in the FDBR control region private storage.

LOCAL: DEDB control blocks and buffer pools for shared VSO are allocated in the FDBR control region private storage. This is the default for IMS 15.2.
ECSA: DEDB control blocks and buffer pools for shared VSO are allocated in ECSA storage.

GROUPNAME=

Specifies the z/OS® cross-system coupling facility group name for the active IMS system and the tracking FDBR region. This parameter is optional. If you do not specify GROUPNAME=, a default name is created by using the ACTIVEIMSID= parameter and the prefix FDR. For example, if the active IMSID is IMS1, the default XCF group name is FDRIMS1.

IRLMFAIL

Specifies the action IMS should take if IRLM fails.

ABEND: IMS to issue abend U3305 if IRLM fails.
NOACT: IMS takes no action if IRLM fails and continues normal processing. NOACT is the default.

SVSOOPEN=SERIAL

Specifies that all areas requiring redo processing in an FDBR system are serially processed. This option is ignored for emergency restart and XRF takeover processing. Use this option to reduce the number of structures that are allocated by FDBR for redo processing.

TIMEOUT=

Specifies the number of seconds that FDBR waits before determining a timeout status for the tracked IMS. Valid values are from 3-999.

The default is 60.

If a value less than 3 is specified, the value 3 is used. If a value greater than 999 is specified, 999 is used.

This parameter is applicable to IMS and DBC procedures.

The value you specify with this parameter applies only to IMS timeout status from XCF. For log surveillance, FDBR uses a five-second timeout value, and a three-second delay interval before calling DBRC to check whether an OLDS switch has occurred.