Control statements for the Image Copy task

The control statement block for the Image Copy task contains the user specifications for controlling the image copy process.

If IC=YES is specified, the control statements for the Image Copy processing can be coded in the ICEIN data set.

For the control statements and the parameters supported under the Smart Reorg utility, see the IMS High Performance Image Copy User's Guide. Also, see the examples that are shown in Example 9: Taking an Image Copy while reorganizing a database.

If the system default values are suitable for your requirements, you do not need to code the statements except for the allocation information for the image copy data set.

The default values can be changed by creating a GLOBAL site default table (FABJGLB0) for IMS HP Image Copy. If you create a FABJGLB0 module and specify a library that contains the module on the STEPLIB DD, IMS HP Image Copy merges it with the system default values for IMS Database Reorganization Expert. For details about the site default table, see the IMS High Performance Image Copy User's Guide.

Recommendation: There are no default values for the allocation information of image copy data sets. It is recommended that you define the allocation information of image copy data sets in the GLOBAL site default table or the GLOBAL statement in the ICEIN data set.

The following default control statement rules apply to IMS HP Image Copy when it is run under the Smart Reorg utility:

  • The AIC (Parallel Image Copy) control statement is used for all DBDSs.
  • The WAIT control statement is inserted into every partition of HALDB.
  • The ICOUT=* parameter is used.
  • The UNIT=SYSALLDA parameter is used.
  • The HDPC=Y parameter is used.
  • The following default values are used for the DBBUF parameter in Type-A Image Copy processing:
    • DBBUF=250 for each data set of HDAM, HIDAM, SHISAM, or HISAM database except for the HIDAM index and the secondary index data set.
    • DBBUF=2000 for the HIDAM index.
    • DBBUF=1 is always used for the secondary index data set without reference to the value in the DBBUF= parameter.

The default values of other parameters of ICEIN control statements except the compression routine (COMPRTN parameter) are the same as those for the stand-alone IMS HP Image Copy.

Notes:
  • Both IC and AIC control statements can be accepted for Type-A Image Copy, and the same image copy processing is done regardless of which control statement is specified. In Type-B Image Copy, IC and AIC work differently. If IC is specified, the image copy function works in serial mode; if AIC is specified, the image copy function works in parallel mode.
  • The WAIT control statement is valid only for Type-B Image Copy. If a WAIT control statement is specified, the image copy control task waits for all subtasks that are activated by the AIC control statements that are coded above the WAIT statement to complete before starting the image copy processes that are identified by the subsequent AIC control statements. If WAIT is specified for Type-A Image Copy, it is ignored.
  • The STACK parameter for the image copy stacking feature is valid only when ICTYPE=B.
  • If you specify COMP=Y in the site default table or the ICEIN DD statement, the default compression routine under the Smart Reorg utility is FABJCMP3.