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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL OneDB™ database servers.
Performance GuideThe HCL OneDB™ Performance Guide describes how to configure and operate your HCL OneDB™ database server to improve overall system throughput and to improve the performance of SQL queries.
Effect of configuration on I/O activityThe configuration of your database server affects I/O activity.
I/O for cooked files for dbspace chunksOn UNIX™, you can control the use of direct I/O for cooked files used for dbspace chunks.
Confirming the use of the direct or concurrent I/O option (UNIX™)You can confirm and monitor the use of direct I/O or concurrent I/O (on AIX®) for cooked file chunks.

Confirming the use of the direct or concurrent I/O option (UNIX)

You can confirm and monitor the use of direct I/O or concurrent I/O (on AIX®) for cooked file chunks.

About this task

You can confirm the use of direct I/O or concurrent I/O by:

Displaying onstat -d information.
The onstat -d command displays information that includes a flag that identifies whether direct I/O, concurrent I/O (on AIX), or neither is used for cooked file chunks.
Verifying that the DIRECT_IO configuration parameter is set to 1 (for direct I/O) or 2 (for concurrent I/O).