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  • PowerExchange for CDC and Mainframe 10.5.4
  • All Products

Table of Contents

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  1. Preface
  2. Part 1: PowerExchange Change Data Capture Introduction
  3. Part 2: CDC Components Configuration and Management
  4. Part 3: CDC Sources Configuration and Management
  5. Part 4: Change Data Extraction
  6. Part 5: Monitoring and Tuning
  7. Appendix A: CDC for z/OS Troubleshooting
  8. Appendix B: DTL__CAPXTIMESTAMP Time Stamps

CDC Guide for z/OS

CDC Guide for z/OS

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Capture Directory Table Sizing

Capture Directory Table Sizing

The DB2 ECCR capture directory tables are each created in their own unique DB2 table space. The tables have certain sizing requirements that must be met for the ECCR to function properly.
The default space allocations from PowerExchange installation are usually sufficient for most DB2 subsystems, although some of the table spaces might create secondary extents. If you have more than 5,000 tables in the DB2 subsystem, or if you have a large number of tables registered for change capture or a large number of columns in these tables, you might need to adjust the PRIQTY primary space and SECQTY secondary space values from installation. Monitor the table spaces to determine if they need to be extended. If the DB2 ECCR cannot extend the table space when needed to support the table sizing requirements, the ECCR abends.
The following table shows the default space allocations from PowerExchange installation and the table-sizing requirements for the capture directory tables:
Default Table Space / Table Name
Install PRIQTY
Install SECQTY
Table Sizing Requirements
PWXPCOLS / TCAPCOLUMNS
180 KB
20 KB
Up to three rows for each column, across all tables from which changes are captured
PWXPFLDS / TCAPFIELDS
3 KB
1
One row for each column that has a FIELDPROC, across all tables from which changes are captured
PWXPSTAT / TCAPSTATUS
3 KB
1 KB
One row for each table from which changes are captured
PWXPTABL / TCAPTABLES
180 KB
20 KB
Up to three rows for each table from changes are captured
PWXPTBSP / TCAPTABLESPACE
180 KB
20 KB
Up to three rows for each table space in the DB2 catalog, including table spaces that contain tables that are
not
 registered for change capture
PWXPUPDT / TCAPUPDATE
3 KB
1 KB
One row for each DB2 ECCR
PWXPWORK / TCAPWORK
720 KB
48 KB
One row for each in-flight catalog change
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