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By Ageev A.A.

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However, if the port numbers in the participating servers do not match the ports in the Instance-owning server, you receive communication errors when you start DB2. On UNIX, the services file is located in the /etc. directory. On Windows, the services file is located in :\WINDOWS\system32\drivers\etc directory. An extract of the services file for our instance in our test environment is shown in Example 3-4. Example 3-4 Extract of a services file DB2_db2inst1 60004/tcp DB2_db2inst1_1 60005/tcp DB2_db2inst1_2 60006/tcp DB2_db2inst1_END 60009/tcp Hosts file Another important consideration is the correct definition of the hosts file.

Support for various hardware configurations DB2 9 with DPF enabled supports symmetric multiprocessor (SMP), massively parallel processing (MPP), and clustered hardware configurations. SMP is a hardware concept in which a single physical machine has multiple CPUs. From a DB2 with DPF-enabled point of view, this is a shared everything architecture, because each database partition shares common CPUs, memory, and disks as shown in Figure 2-1. CPU CPU CPU Memory Partition Disk Disk Disk Figure 2-1 An SMP configuration MPP is a hardware concept in which a set of servers is connected by a high-speed network and a shared nothing application, such as DB2, is used as shown in Figure 2-2 on page 17.

I/O parallelism DB2 can exploit I/O parallelism by simultaneously reading from and writing to devices. During the planning phases of database design, table space container placement, as well as the number of containers for the table space, must be considered. Having multiple containers for a single table space can dramatically improve I/O performance due to I/O parallelism. Query optimization DB2 9’s cost-based query optimizer is DPF-aware. This implies that the query optimizer uses the system configuration, the database configuration, and the statistics stored in the system catalogs to generate the most efficient access plan to satisfy SQL queries across multiple database partitions.

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A 3/2-approximation algorithm for the jump number of interval orders by Ageev A.A.

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