MCDB22

This Management Class is intended for table spaces that are

 

allowed to migrate and require less availability than that defined

 

in the MCDB2M1 Management Class. This Management Class

causes migration after one week of inactivity and the table space will migrate directly to level 2. For example, this Management Class can be used for Test or Development table spaces.

Table 13. SMS Management Classes for DB2 Databases

 

MCDB20

MCDB21

MCDB22

 

 

 

 

Expire after Days Non-usage

NOLIMIT

NOLIMIT

NOLIMIT

 

 

 

 

Expire after Date/Days

NOLIMIT

NOLIMIT

NOLIMIT

 

 

 

 

Retention Limit

NOLIMIT

NOLIMIT

NOLIMIT

 

 

 

 

Primary Days Non-usage

 

7

7

 

 

 

 

Level 1 Days Date/Days

 

14

0

 

 

 

 

Command or Auto Migrate

None

Both

Both

 

 

 

 

Backup Options

Not Applicable

Not Applicable

Not Applicable

 

 

 

 

6.1.5 SMS Storage Groups

SMS Storage Classes and Management Classes are combined to generate Storage Groups. This function is performed by the ACS routines. Table 14 on page 51 shows the relationship between SMS Storage Classes and the SMS Management Classes with the SMS Storage Groups. Only those Storage Groups required to satisfy DB2 database requirements need to be defined.

SMS Storage Groups should be created based on available disk types and data set requirements as defined in Storage Classes and Management Classes. Only exceptionally, for large (partitioned) table spaces and for critical table spaces, may strict data set placement be an issue. Only in these cases may special SMS Storage Groups be defined.

Table 15 on page 51 shows the attributes of the example SMS Storage Groups for DB2 table and index spaces. These are:

SGDB20

Standard Storage Group intended to satisfy most of the DB2 table

 

spaces and index spaces. No DFSMShsm migration nor DFSMS

 

backup is required.

SGDB21

Storage Group for DB2 table spaces and index spaces that may

 

migrate; for example, data warehouse table and index spaces.

SGDB22

Storage Group for DB2 table spaces and index spaces that may

 

migrate to level 2. For example, development system table and

 

index spaces.

SGDBFAST

Storage Group for DB2 table spaces and index spaces requiring

 

performance. No DFSMShsm migration nor DFSMS backup.

SGDBCRIT

Storage Group for DB2 table spaces and index spaces requiring

 

performance and availability. No DFSMShsm migration nor

 

DFSMS backup.

50Storage Management with DB2 for OS/390

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IBM 5655-DB2, 5695-DF1 manual MCDB22, SGDB20, SGDB21, SGDB22, Sgdbfast, Sgdbcrit

5695-DF1, 5655-DB2 specifications

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