By Whei-Jen Chen, Alain Fisher, Aman Lalla, Andrew D McLauchlan, Doug Agnew
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Additional info for Database Partitioning, Table Partitioning, and Mdc for DB2 9
Example text
Cfg file is located in the instance owner’s home directory. It contains one entry for each server participating in the instance. Ensure that the instance is stopped before updating the file using a text editor. 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.
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. Having properly tuned buffer pools is important for the performance of the database, because the buffer pools are primarily a cache for I/O operations. Database design When designing a DPF-enabled database, the database administrator needs to: Understand database partitioning Select the number of database partitions Define the database partition groups Define the table space within these partition groups Understand distribution maps Select distribution keys Recovery In a DPF-enabled environment, each database partition must be backed up for recovery purposes.
Memory requirements are affected by the size and complexity of your database system, as well as by the extent of database activity and the number of clients accessing your system. 2 Planning considerations In this section, we discuss several of the important decisions that you must make when planning a partitioned database environment. Many of the decisions made Chapter 3. Database partitioning 37 during the planning stages require an understanding of the machine configuration in the environment, storage that is available, raw data sizes, and the expected workload.