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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 ReferenceThe HCL OneDB™ Administrator's Reference includes comprehensive descriptions of HCL OneDB™ configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as onmode and onstat, logical-log records, disk structures, event alarms, and unnumbered error messages.
Administrative Utilities
The onspaces utilityUse the onspaces utility to manage the storage spaces in your database.
Avoid overwriting a chunk

Avoid overwriting a chunk

The chunks associated with each HCL OneDB™ instance are not known to other HCL OneDB instances. It is possible to inadvertently create a chunk on a file or device that is allocated as a chunk to another HCL OneDB instance, which results in data corruption.

If you attempt to initialize an instance, where the ROOTPATH configuration parameter specifies a file or device that is the root chunk of another instance, the command fails with the following message in the online.log:

DISK INITIALIZATION ABORTED: potential instance overwrite detected.

To disable this initialization check, set the FULL_DISK_INIT configuration parameter to 1 in your configuration file and try to initialize the instance again. However, this initialization check is restricted to the root chunk. Adding dbspaces or chunks succeeds even when the file or device is allocated to another instance.

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