Chapter 7. Managing DB2 Recovery Data Sets with SMS

Some DB2 data sets are standard sequential files or partitioned data sets. Many installations already manage these data sets with SMS and have already SMS classes defined for these data sets. Therefore, this chapter only analyzes DB2 recovery related data sets.

This chapter describes attributes for SMS management of the DB2 recovery data sets and provides example SMS constructs for these data sets. DB2 recovery data sets are described in 3.6, “DB2 Recovery Data Sets” on page 17. This chapter includes examples of SMS Data, Storage and Management Classes for the following data sets:

Bootstrap data sets (BSDS)

Active log data sets

Archive log data sets

Image copy data sets

7.1SMS Examples for DB2 Recovery Data Sets

The examples shown in this section do not demonstrate all the possibilities that SMS offers; neither can they consider all the different requirements specific to each DB2 installation. Each installation is advised to review these examples and create those classes that best suit its requirements. The examples shown here are extracted and adapted from DFSMS/MVS Implementing System-Managed Storage, SC26-3123.

7.1.1 SMS Data Class

DB2 recovery data sets have different attributes. Data Classes can optionally be defined for these data sets.

7.1.2 SMS Storage Class

DB2 administrators may require several Storage Classes for DB2 recovery data sets. These Storage Classes have high availability requirements. Performance requirements may be less severe, with the exception of the active log data sets which have very high performance requirements. Table 19 on page 64 shows four examples of Storage Classes for the DB2 recovery data sets. These are:

SCDBIC

This Storage Class is intended for image copy data sets. It

 

provides good performance and good availability.

SCDBICH

This Storage Class is intended for image copy data sets with

 

a high availability and high performance requirement.

SCDBARCH

This Storage Class is intended for archive log data sets. It

 

provides good performance and high availability.

SCDBACTL

This Storage Class is intended for the BSDS and active log

 

data sets. These data sets are allocated once and rarely

 

redefined. Strict placement is important in order to obtain high

 

availability and high performance. SCDBACTL uses

 

guaranteed space to allocate the data sets on specific

 

volumes within the assigned Storage Group.

© Copyright IBM Corp. 1999

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IBM 5695-DF1, 5655-DB2 manual Managing DB2 Recovery Data Sets with SMS, SMS Examples for DB2 Recovery Data Sets

5695-DF1, 5655-DB2 specifications

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