By Whei-Jen Chen, Alain Fisher, Aman Lalla, Andrew D McLauchlan, Doug Agnew
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Extra info for Database Partitioning, Table Partitioning, and Mdc for DB2 9
Chapter 3. 6 Sizing the tables Knowing the size of your tables is important to determine how many database partitions you might need. For example, for a table space with a 4 KB page size, the maximum size of a table is 64 GB per database partition. To allow for larger tables, more database partitions can be added. We explain how to size tables by using an example of a large partitioned database environment. We used a two p690 (32-way/128 GB memory) environment to calculate the table sizes. Figure 3-1 details the estimated table sizes that we used in our example to illustrate sizing tables.
By default on DB2 9, shared memory is used for the communication between logical database partitions on the same physical machine. This is to improve communications performance between logical database partitions. For multiple database partitions, sufficient physical memory must be available to prevent memory bottlenecks, such as the overcommitment of memory. Designing the physical layout of the database on disk is critical to the I/O throughput of the database. In general, table space containers need to be placed across as many physical disks as possible to gain the benefits of parallelism.
8. Create database objects: tables, indexes, and so forth. 9. Load data. We discuss these steps and the related topics in details in the following sections. 1 Creating instances and databases The first step in setting up a partitioned database environment is to install DB2. You must install DB2 on each physical machine that is going to participate in the database partition environment. In our test database environment, we installed DB2 using the db2_install utility, which is only available on UNIX and Linux.
Database Partitioning, Table Partitioning, and Mdc for DB2 9 by Whei-Jen Chen, Alain Fisher, Aman Lalla, Andrew D McLauchlan, Doug Agnew