3.5.1 Matrix Server Release Notes

Using Oracle with

PolyServe Matrix Server

PolyServe Matrix Server has undergone a high degree of Oracle

performance and stress testing by the PolyServe Database Engineering

team.

See the PolyServe Web site for the recommended Oracle release for use

with PolyServe Matrix Server.

Asynchronous I/O Support

While certain Linux distributions may support Asynchronous I/O for raw

partitions and non-clustered filesystems, these implementations are not

supported on clustered filesystems. PolyServe, however, has

implemented the Oracle Disk Manager (ODM) API. ODM implements

Asynchronous I/O as specified by Oracle Corporation. For more

information about the PolyServe implementation, see the PolyServe MxS

Oracle Database Solution Pack Release Notes.

Without ODM, acceptable OLTP performance can usually be achieved by

configuring Oracle instances to use multiple DBWR slave processes.

In practice, PolyServe Database Engineering has found that configuring

10 DBWR slaves per processor offers effective SGA page flushing even

under excessive checkpoint activity.

On a dual-processor node, the following init.ora parameters should be set

to enable efficient SGA buffer flushing:

•db_writer_processes = 1

• dbwr_io_slaves = 20