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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.
Administrator's GuideThe HCL OneDB™ Administrator's Guide provides the information required to administer HCL OneDB™.
Fault tolerance
Consistency checking
Deal with corruption
Find symptoms of corruptionYou can find information about corruption several different ways.

Find symptoms of corruption

You can find information about corruption several different ways.

The database server alerts the user and administrator to possible corruption in the following ways:

Error messages reported to the application state that pages, tables, or databases cannot be found. One of the following errors is always returned to the application if an operation has failed because of an inconsistency in the underlying data or overhead information:
```
-105 ISAM error: bad isam file format
-172 ISAM error: Unexpected internal error
```
Assertion-failure reports are written to the database server message log. They always indicate files that contain additional diagnostic information that can help you determine the source of the problem. See Verify consistency.
The oncheck utility returns errors
The ph_alert table shows information about corrupted indexes.