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Don Burleson Blog 







parallel_adaptive_multi_user tips

Oracle Database Tips by Donald BurlesonJanuary 31,  2015


The parallel_adaptive_multi_user is not a good parameter to set.  Oracle DOES NOT recommend setting parallel_adaptive_multi_user.

Setting parallel_adaptive_multi_user=true will also make DDL (create table) commands much slower.

Burleson Consulting recommends only setting parallelism for OLTP systems at the query-level, using "alter session" or "parallel" hints and NOT to set parallelism at the system-level or table level (alter table xxx parallel degree nnn).

parallel_adaptive_multi_user: When set to true, it enables an adaptive algorithm, which automatically reduces the requested degree of parallelism based on the system load at query startup time.

If set parallel_adaptive_multi_user =true, it forces calculation of large pool size is over-ridden if size manually set.



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