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Wait on TT-ENQUEUE when Adding a Datafile (Doc ID 1101758.1)

Last updated on AUGUST 06, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.1.0 [Release 11.1 to 11.2]
Information in this document applies to any platform.




Symptoms

Taking a long period of time when adding a datafile to tablespace.
System state dump shows enq: TT - contention which is blocking users from accessing the tablespace.

Dumping one waiter:
    inst: 1, sid: 530, ser: 3095
    wait event: 'enq: TT - contention'
      p1: 'name|mode'=0x54540004
      p2: 'tablespace ID'=0x7
      p3: 'operation'=0x10
    row_wait_obj#: 14275, block#: 0, row#: 0, file# 0
    min_blocked_time: 8 secs, waiter_cache_ver: 64804

Cause

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