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Oracle® Database Reference
12c Release 1 (12.1)

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V$SESSION_WAIT_HISTORY displays the last 10 wait events for each active session.

Column Datatype Description
SID NUMBER Session identifier
SEQ# NUMBER Sequence of wait events; 1 is the most recent
EVENT# NUMBER Event number
EVENT VARCHAR2(64) Resource or event for which the session is waiting
P1TEXT VARCHAR2(64) Description of the first wait event parameter
P1 NUMBER First wait event parameter (in decimal)
P2TEXT VARCHAR2(64) Description of the second wait event parameter
P2 NUMBER Second wait event parameter (in decimal)
P3TEXT VARCHAR2(64) Description of the third wait event parameter
P3 NUMBER Third wait event parameter (in decimal)
WAIT_TIME NUMBER Amount of time waited (in hundredths of a second)
WAIT_TIME_MICRO NUMBER Amount of time waited (in microseconds)
TIME_SINCE_LAST_WAIT_MICRO NUMBER Time elapsed (in microseconds) since the end of the previous wait in the wait history
CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data