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Oracle® Database Reference
10g Release 2 (10.2)

Part Number B14237-01
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DBA_HIST_ACTIVE_SESS_HISTORY

DBA_HIST_ACTIVE_SESS_HISTORY displays the history of the contents of the in-memory active session history of recent system activity. This view contains snapshots of V$ACTIVE_SESSION_HISTORY. See "V$ACTIVE_SESSION_HISTORY" for further interpretation details for many of these columns (except SNAP_ID, DBID, and INSTANCE_NUMBER).

Column Datatype NULL Description
SNAP_ID NUMBER   Unique snapshot ID
DBID NUMBER   Database ID for the snapshot
INSTANCE_NUMBER NUMBER   Instance number for the snapshot
SAMPLE_ID NUMBER   ID of the sample
SAMPLE_TIME TIMESTAMP(3)   Time of the sample
SESSION_ID NUMBER   Session identifier
SESSION_SERIAL# NUMBER   Session serial number (used to uniquely identify a session's objects)
USER_ID NUMBER   Oracle user identifier
SQL_ID VARCHAR2(13)   SQL identifier of the SQL statement that is currently being executed
SQL_CHILD_NUMBER NUMBER   Child number of the SQL statement that is currently being executed
SQL_PLAN_HASH_VALUE NUMBER   Numerical representation of the SQL plan for the cursor
FORCE_MATCHING_SIGNATURE NUMBER
The signature used when the CURSOR_SHARING parameter is set to FORCE
SQL_OPCODE NUMBER
Indicates what phase of operation the SQL statement is in
SERVICE_HASH NUMBER   Hash that identifies the Service
SESSION_TYPE VARCHAR2(10)   Session type:
  • FOREGROUND

  • BACKGROUND

SESSION_STATE VARCHAR2(7)
Session state:
  • WAITING

  • ON CPU

QC_SESSION_ID NUMBER   Query coordinator session ID
QC_INSTANCE_ID NUMBER   Query coordinator instance ID
BLOCKING_SESSION NUMBER
Session identifier of the blocking session. Populated only when the session was waiting for enqueues or a "buffer busy" wait. Maps to V$SESSION.BLOCKING_SESSION.
BLOCKING_SESSION_STATUS VARCHAR2(11)
Status of the blocking session:
  • VALID

  • NO HOLDER

  • GLOBAL

  • NOT IN WAIT

  • UNKNOWN

BLOCKING_SESSION_SERIAL# NUMBER
Serial number of the blocking session
EVENT VARCHAR2(64)
If SESSION_STATE = WAITING, then the event for which the session was waiting at the time of sampling.

If SESSION_STATE = ON CPU, then this column will be NULL.

EVENT_ID NUMBER
Identifier of the resource or event for which the session is waiting or for which the session last waited
SEQ# NUMBER
Sequence number that uniquely identifies the wait (incremented for each wait)
P1TEXT VARCHAR2(64)
Text of first additional parameter
P1 NUMBER
First additional parameter
P2TEXT VARCHAR2(64)
Text of second additional parameter
P2 NUMBER
Second additional parameter
P3TEXT VARCHAR2(64)
Text of third additional parameter
P3 NUMBER
Third additional parameter
WAIT_CLASS VARCHAR2(64)
Wait class name of the event for which the session was waiting at the time of sampling. Interpretation is similar to that of the EVENT column. Maps to V$SESSION.WAIT_CLASS.
WAIT_CLASS_ID NUMBER
Wait class identifier of the event for which the session was waiting at the time of sampling. Interpretation is similar to that of the EVENT column. Maps to V$SESSION.WAIT_CLASS_ID.
WAIT_TIME NUMBER
Total wait time for the event for which the session last waited (0 if currently waiting)
TIME_WAITED NUMBER
Time that the current session actually spent waiting for the event. This column is set for waits that were in progress at the time the sample was taken.
XID RAW(8)
Transaction ID that the session was working on at the time of sampling. V$SESSION does not contain this information.
CURRENT_OBJ# NUMBER   Object ID of the object that the session is currently referencing. This information is only available if the session was waiting for Application, Cluster, Concurrency, and User I/O wait events. Maps to V$SESSION.ROW_WAIT_OBJ#.
CURRENT_FILE# NUMBER   File number of the file containing the block that the session is currently referencing. This information is only available if the session was waiting for Cluster, Concurrency, and User I/O wait events. Maps to V$SESSION.ROW_WAIT_FILE#.
CURRENT_BLOCK# NUMBER   ID of the block that the session is currently referencing
PROGRAM VARCHAR2(48)   Name of the operating system program
MODULE VARCHAR2(48)   Name of the currently executing module as set by the DBMS_APPLICATION_INFO.SET_MODULE procedure
ACTION VARCHAR2(32)   Name of the currently executing action as set by the DBMS_APPLICATION_INFO.SET_ACTION procedure
CLIENT_ID VARCHAR2(64)   Client identifier of the session