oracle - Why my LibraryCache gets locked with parallel queries? -


i using oracle 12c, needed understand,

1) facing issue of several sessions in locked state (librarycache). showing me parallel queries running, have not set parallel clause in ddl of table object. migration indexes created parallel clause create not understand why taking dml also.

2) if assume if case while running dml sqleditor executionplan shows me noting parallel.

finally got answer through,

http://blog.tanelpoder.com/2007/06/23/a-gotcha-with-parallel-index-builds-parallel-degree-and-query-plans/


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