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  1. Preface
  2. Introduction to PowerExchange
  3. DBMOVER Configuration File
  4. Netport Jobs
  5. PowerExchange Message Logs and Destination Overrides
  6. SMF Statistics Logging and Reporting
  7. PowerExchange Security
  8. Secure Sockets Layer Support
  9. PowerExchange Alternative Network Security
  10. PowerExchange Nonrelational SQL
  11. PowerExchange Globalization
  12. Using the PowerExchange ODBC Drivers
  13. PowerExchange Datatypes and Conversion Matrix
  14. DTL__CAPXTIMESTAMP Time Stamps
  15. PowerExchange Glossary

Determining the Size of the Alternative Log Data Sets on z/OS

Determining the Size of the Alternative Log Data Sets on z/OS

PowerExchange uses DCB attributes to allocate alternative log data sets on z/OS.
On z/OS, PowerExchange uses the following DCB attributes to allocate alternative log data sets:
  • Block size (BLKSIZE) is 27998.
  • Data set organization (DSORG) is PS.
  • Record format (RECFM) is VB.
  • Record length (LRECL) is the value of the RECLEN parameter in the TRACING statement.
You can use the following formulas to calculate the primary space and secondary space, in blocks, of an alternative log data set:
primary space =
log_size
/ 27998 secondary space =
primary_space
/ 10
These formulas include the following variables:
  • log_size
    is the value that is specified for the SIZE parameter in the TRACING statement, converted from megabytes to bytes.
  • primary_space
    is the
    log_size
    divided by 27998, where 27998 is the block size in bytes.
  • secondary_space
    is the
    primary space
    divided by 10.
For example, if you specify 100 for the SIZE parameter, use the following formulas to calculate primary space and secondary space:
primary space = 104,857,600 / 27998 = 3745 blocks secondary space = 3745 / 10 = 374 blocks