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By Whei-Jen Chen, Alain Fisher, Aman Lalla, Andrew D McLauchlan, Doug Agnew

ISBN-10: 0738489220

ISBN-13: 9780738489223

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Each database partition’s log files must be managed independently of other database partitions. Memory The main memory allocation in a DB2 database is for the database buffer pool. In a DPF-enabled database with multiple database partitions, the buffer pools are allocated per partition. In a DSS environment, most of the memory must be allocated for buffer pools and sorting. Decisions have to be made as to the number of buffer pools to create. A buffer pool is required for each page size that is used in the database.

Cfg file can be updated to add or remove a server in the DB2 instance. cfg to specify on which hosts and servers the database is created. cfg file on UNIX is: node number, hostname, logical port, netname, resourcesetname In our test environment, we decided to use four logical partitions. cfg is updated as shown in Example 3-2. cfg file in our test environment 0 1 2 3 Clyde Clyde Clyde Clyde 0 1 2 3 Chapter 3. Database partitioning 47 In our example in Example 3-2 on page 47, we have defined four partitions on the same host, which indicates that these are logical database partitions.

Log management increases as the number of partitions increase, for example, archiving and retrieving log files. For performance reasons, consider placing transaction log files on your fastest disks that are independent of your data. The largest table size under each partition This must not be too high. There is an architectural limit per partition of 64 GB for 4 K page size; 128 GB for 8 K page size; 256 GB for 16 K page size; and 512 GB for 32 K page size. If you determine that the architectural limits might be a problem, consider adding more database partitions to the environment during the planning phase.

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Database Partitioning, Table Partitioning, and Mdc for DB2 9 by Whei-Jen Chen, Alain Fisher, Aman Lalla, Andrew D McLauchlan, Doug Agnew

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