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Additional resources for Database Partitioning, Table Partitioning, and Mdc for DB2 9
Sample text
Htm After we successfully installed DB2 on our AIX machine, we proceeded to create a DB2 instance. In order to create an instance, we need a user ID for the instance owner. In our case, we created a user called db2inst1, which has a home directory called /home/db2inst1/. 46 Database Partitioning, Table Partitioning, and MDC for DB2 9 Note: The /home/
This also presumes that the partition key is appropriate for the SQL. This is represented in Figure 2-4. Non-partitioned Partitioned Table Table 1 Scans required partitions Table 1 Scans all data 2000 - 2008 2001 2000 2002 2000 - 2008 SELECT ... FROM Table 1 WHERE DATE >= 2001 AND DATE <= 2002 SELECT ... FROM Table 1 WHERE DATE >= 2001 AND DATE <= 2002 Figure 2-4 Performance improvement through scan limiting 22 Database Partitioning, Table Partitioning, and MDC for DB2 9 2003 ... Flexible index placement Indexes can now be placed in different table spaces allowing for more granular control of index placement.
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. 1 Deciding on the number of database partitions DB2 supports up to a maximum of 1000 partitions. When trying to determine the number of database partitions to use, consider: The total amount of data under each partition This must not be too high to improve the parallelism of partition-wide operations, such as backups.