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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™.
Disk, memory, and process management
Shared memoryThese topics describe the content of database server shared memory, the factors that determine the sizes of shared-memory areas, and how data moves into and out of shared memory.
Flush data to diskWriting a buffer to disk is called buffer flushing.
Types of writes during flushingTo provide you with information about the specific condition that prompted buffer-flushing activity, the database server defines three types of writes and counts how often each write occurs.

Types of writes during flushing

To provide you with information about the specific condition that prompted buffer-flushing activity, the database server defines three types of writes and counts how often each write occurs.

The types of writes are as follows:

Foreground write
LRU write
Chunk write

To see the write counts that the database server maintains, run the onstat -F command.

If you implement mirroring for the database server, data is always written to the primary chunk first. The write is then repeated on the mirror chunk. Writes to a mirror chunk are included in the counts.