Temporal tables should be row partitioned to improve query performance. Partitioning can logically group the table rows into open and closed rows. Queries of open rows are directed automatically to the partition containing the open rows.
Example: Row Partitioning an ANSI System-Time Table
To row partition a system-time table, use the following PARTITION BY clause.
CREATE MULTISET TABLE employee_systime ( eid INTEGER NOT NULL, ename VARCHAR(10) NOT NULL, deptno INTEGER NOT NULL, sys_start TIMESTAMP WITH TIME ZONE NOT NULL GENERATED ALWAYS AS ROW START, sys_end TIMESTAMP WITH TIME ZONE NOT NULL GENERATED ALWAYS AS ROW END, PERIOD FOR SYSTEM_TIME(sys_start, sys_end) ) PRIMARY INDEX(eid) WITH SYSTEM VERSIONING PARTITION BY CASE_N (END(SYSTEM_TIME) >= CURRENT_TIMESTAMP, NO CASE);
Maintaining a Current Partition
As time passes, and current rows become history rows, you should periodically use the ALTER TABLE TO CURRENT statement to transition history rows out of the current partition into the history partition. ALTER TABLE TO CURRENT resolves the partitioning expressions again, transitioning rows to their appropriate partitions per the updated partitioning expressions. For example:
ALTER TABLE temporal_table_name TO CURRENT;
This statement also updates any system-defined join indexes that were automatically created for primary key and unique constraints defined on the table.