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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.
Virtual portion of shared memoryThe virtual portion of shared memory is expandable by the database server and can be paged out to disk by the operating system.
Data-distribution cacheThe database server uses distribution statistics generated by the UPDATE STATISTICS statement in the MEDIUM or HIGH mode to determine the query plan with the lowest cost.
Sort memoryThe amount of virtual shared memory that the database server allocates for a sort depends on the number of rows to be sorted and the size of the row, along with other factors.

Sort memory

The amount of virtual shared memory that the database server allocates for a sort depends on the number of rows to be sorted and the size of the row, along with other factors.

The following database operations can use large amounts of the virtual portion of shared memory to sort data:

Decision-support queries that involve joins, groups, aggregates and sort operations
Index builds
UPDATE STATISTICS statement in SQL

For information about parallel sorts, see your HCL OneDB™ Performance Guide.

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