Global Index Maintenance (GIDX) on Partitioned Tables not Running Asynchronously in 12c+
(Doc ID 2404701.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124 and later
Information in this document applies to any platform.
You are running RDBMS version 12c or higher and still see the synchronous global-index-maintenance (GIDX) behavior. The SQL that indicates synchronous GIDX maintenance is running is the following recursive SQL:
Starting in 126.96.36.199, GIDX maintenance after partition maintenance operations (PMOPs) using the UPDATE INDEXES clause happens asynchronously. It also introduces index coalesce in addition to cleanup_orphans operations. The asynchronous nature allows the PMOPs DDL to run faster and reduce the window where we hold a DML lock on the partition that blocks other operations. This maintenance is done via the dbms_scheduler job PMO_DEFERRED_GIDX_MAINT_JOB, which runs during the maintenance window, by default.
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