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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.
Placement of critical dataThe disk or disks that contain the system reserved pages, the physical log, and the dbspaces that contain the logical-log files are critical to the operation of the database server. The database server cannot operate if any of these elements becomes unavailable. By default, the database server places all three critical elements in the root dbspace.
Consider mirroring for critical data componentsConsider mirroring for the dbspaces that contain critical data. Mirroring these dbspaces ensures that the database server can continue to operate even when a single disk fails.
Consider mirroring the root dbspaceYou can achieve a certain degree of fault tolerance with a minimum performance penalty if you mirror the root dbspace and restrict its contents to read-only or seldom-accessed tables.

Consider mirroring the root dbspace

You can achieve a certain degree of fault tolerance with a minimum performance penalty if you mirror the root dbspace and restrict its contents to read-only or seldom-accessed tables.

When you place update-intensive tables in other, nonmirrored dbspaces, you can use the database server backup-and-restore facilities to perform warm restores of those tables in the event of a disk failure. When the root dbspace is mirrored, the database server remains online to service other transactions while the failed disk is being repaired.

When you mirror the root dbspace, always place the first chunk on a different device than that of the mirror. The MIRRORPATH configuration parameter should have a different value than ROOTPATH.