Database and area recovery status lists
IMS DEDB Fast Recovery generates status lists for databases and areas. These lists are called the recovery status lists and contain the information you need to complete the IMS cold start process.
By using the specified system logs, IMS DEDB Fast Recovery identifies all DEDB areas that need recovery, allocates them dynamically, and performs recovery.
IMS DEDB Fast Recovery generates the following recovery status lists. Examples and further descriptions for the lists are provided in the following topics.
- Backout Required PSB list
- This list names the DL/I databases and associated PSB names that have to be backed out by the IMS Batch Backout utility.
- Database Status list and the DEDB Area Status list
- These lists show the status of the DL/I databases and DEDB areas at the time when IMS failed, and provide actions required before and after IMS cold start to maintain database integrity.
- OLDS/SLDS list
- This list shows which log data sets were used by IMS DEDB Fast Recovery.
- DEDB Snap Dump list
- This list provides snap dumps of the damaged area control intervals (CIs) that IMS DEDB Fast Recovery reads to recover a DEDB.
- OLDS Sort list
- This list is produced only when certain parameters are specified.
If DBRC=N and AUTO=Y are specified, IMS DEDB Fast Recovery determines the last-used and previously used OLDS and prints the OLDS Sort list of OLDSs used and their status.
- Recovered CI Summary list
- This list shows the number of VSAM CIs recovered and the information associated with the CIs in each area where IMS DEDB Fast Recovery recovered VSAM CIs.
- Recovered Data CI Bitmap
- This list shows bitmap of the updated data CIs for each recovery buffer in each area.
- Resync Control Statement list
- This list is provided to prepare Resync control statements correctly in a two-phase commit process environment such as DBCTL.
- External Subsystem (ESS) UOR Status list
- This list shows in-doubt UORs in the external subsystem; for example, a Db2® subsystem is one of the external subsystems. When the failed IMS was the sync point coordinator, this list provides the actions required for the in-doubt UORs in the external subsystem.
- MSDB Checkpoint Data Set list
- This list is generated when you run IMS DEDB Fast Recovery with MSDB=Y or MSDB=O specified. It is generated in the data set specified by the SYSPRINT DD statement.