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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.
Improving individual query performanceYou can test, monitor, and improve queries.
Update statistics when they are not generated automaticallyThe UPDATE STATISTICS statement updates the statistics in the system catalog tables that the optimizer uses to determine the lowest-cost query plan.
Update the statistics for the number of rowsWhen you run UPDATE STATISTICS LOW, the database server updates the statistics in the table, row, and page counts in the system catalog tables. You should run UPDATE STATISTICS LOW as often as necessary to ensure that the statistic for the number of rows is as current as possible.

Update the statistics for the number of rows

When you run UPDATE STATISTICS LOW, the database server updates the statistics in the table, row, and page counts in the system catalog tables. You should run UPDATE STATISTICS LOW as often as necessary to ensure that the statistic for the number of rows is as current as possible.

If the cardinality of a table changes often, run the statement more often for that table.

LOW is the default mode for UPDATE STATISTICS.

The following sample SQL statement updates the statistics in the systables, syscolumns, and sysindexes system catalog tables but does not update the data distributions:

UPDATE STATISTICS FOR TABLE tab1;