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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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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).

Note:

If you want to perform a join with the snapshots view, use the DBA_HIST_ASH_SNAPSHOT view instead of the DBA_HIST_SNAPSHOT view.
Column Datatype NULL Description
SNAP_ID NUMBER NOT NULL Unique snapshot ID
DBID NUMBER NOT NULL Database ID for the snapshot
INSTANCE_NUMBER NUMBER NOT NULL Instance number for the snapshot
SAMPLE_ID NUMBER NOT NULL ID of the sample
SAMPLE_TIME TIMESTAMP(3) NOT NULL Time of the sample
SESSION_ID NUMBER NOT NULL Session identifier
SESSION_SERIAL# NUMBER   Session serial number (used to uniquely identify a session's objects)
SESSION_TYPE VARCHAR2(10)   Session type:
  • FOREGROUND

  • BACKGROUND

FLAGS NUMBER   Reserved for future use
USER_ID NUMBER   Oracle user identifier
SQL_ID VARCHAR2(13)   SQL identifier of the SQL statement that is currently being executed
IS_SQLID_CURRENT VARCHAR2(1)   Indicates whether the SQL identifier in the SQL_ID column is being executed (Y) or not (N)
SQL_CHILD_NUMBER NUMBER   Child number of the SQL statement that is currently being executed
SQL_OPCODE NUMBER   Indicates what phase of operation the SQL statement is in
SQL_OPNAME VARCHAR2(64)   SQL command name
FORCE_MATCHING_SIGNATURE NUMBER   Signature used when the CURSOR_SHARING parameter is set to FORCE
TOP_LEVEL_SQL_ID VARCHAR2(13)   SQL identifier of the top level SQL statement
TOP_LEVEL_SQL_OPCODE NUMBER   Indicates what phase of operation the top level SQL statement was in
SQL_PLAN_HASH_VALUE NUMBER   Numerical representation of the SQL plan for the cursor
SQL_PLAN_LINE_ID NUMBER   SQL plan line ID
SQL_PLAN_OPERATION VARCHAR2(64)   Plan operation name
SQL_PLAN_OPTIONS VARCHAR2(64)   Plan operation options
SQL_EXEC_ID NUMBER   SQL execution identifier
SQL_EXEC_START DATE   Time when the execution of the SQL started
PLSQL_ENTRY_OBJECT_ID NUMBER   Object ID of the top-most PL/SQL subprogram on the stack (or NULL if there is no PL/SQL subprogram on the stack)
PLSQL_ENTRY_SUBPROGRAM_ID NUMBER   Subprogram ID of the top-most PL/SQL subprogram on the stack (or NULL if there is no PL/SQL subprogram on the stack)
PLSQL_OBJECT_ID NUMBER   Object ID of the currently executing PL/SQL subprogram (or NULL if executing SQL)
PLSQL_SUBPROGRAM_ID NUMBER   Subprogram ID of the currently executing PL/SQL object (or NULL if executing SQL)
QC_INSTANCE_ID NUMBER   Query coordinator instance ID
QC_SESSION_ID NUMBER   Query coordinator session ID
QC_SESSION_SERIAL# NUMBER   Query coordinator session serial number
PX_FLAGS NUMBER   Reserved for internal use
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)
SESSION_STATE VARCHAR2(7)   Session state:
  • WAITING

  • ON CPU

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.
BLOCKING_SESSION_STATUS VARCHAR2(11)   Status of the blocking session:
  • VALID

  • NO HOLDER

  • GLOBAL

  • NOT IN WAIT

  • UNKNOWN

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$SESSION.BLOCKING_SESSION.
BLOCKING_SESSION_SERIAL# NUMBER   Serial number of the blocking session
BLOCKING_INST_ID NUMBER   Instance number of the blocker shown in BLOCKING_SESSION
BLOCKING_HANGCHAIN_INFO VARCHAR2(1)   Indicates whether the information about BLOCKING_SESSION comes from the hang chain (Y) or not (N)
CURRENT_OBJ# NUMBER   Object ID of the object that the session is currently referencing. This information is only available if the session was waiting for Application, Cluster, Concurrency, and User I/O wait events. Maps to V$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$SESSION.ROW_WAIT_FILE#.
CURRENT_BLOCK# NUMBER   ID of the block that the session is currently referencing
CURRENT_ROW# NUMBER   Row identifier that the session is referencing
TOP_LEVEL_CALL# NUMBER   Oracle top level call number
TOP_LEVEL_CALL_NAME VARCHAR2(64)   Oracle top level call name
CONSUMER_GROUP_ID NUMBER   Consumer group ID
XID RAW(8)   Transaction ID that the session was working on at the time of sampling. V$SESSION does not contain this information.
REMOTE_INSTANCE# NUMBER   Remote instance identifier that will serve the block that this session is waiting for. This information is only available if the session was waiting for cluster events.
TIME_MODEL NUMBER   Time model information
IN_CONNECTION_MGMT VARCHAR2(1)   Indicates whether the session was doing connection management at the time of sampling (Y) or not (N)
IN_PARSE VARCHAR2(1)   Indicates whether the session was parsing at the time of sampling (Y) or not (N)
IN_HARD_PARSE VARCHAR2(1)   Indicates whether the session was hard parsing at the time of sampling (Y) or not (N)
IN_SQL_EXECUTION VARCHAR2(1)   Indicates whether the session was executing SQL statements at the time of sampling (Y) or not (N)
IN_PLSQL_EXECUTION VARCHAR2(1)   Indicates whether the session was executing PL/SQL at the time of sampling (Y) or not (N)
IN_PLSQL_RPC VARCHAR2(1)   Indicates whether the session was executing inbound PL/SQL RPC calls at the time of sampling (Y) or not (N)
IN_PLSQL_COMPILATION VARCHAR2(1)   Indicates whether the session was compiling PL/SQL at the time of sampling (Y) or not (N)
IN_JAVA_EXECUTION VARCHAR2(1)   Indicates whether the session was executing Java at the time of sampling (Y) or not (N)
IN_BIND VARCHAR2(1)   Indicates whether the session was doing bind operations at the time of sampling (Y) or not (N)
IN_CURSOR_CLOSE VARCHAR2(1)   Indicates whether the session was closing a cursor at the time of sampling (Y) or not (N)
IN_SEQUENCE_LOAD VARCHAR2(1)   Indicates whether the session is loading in sequence (in sequence load code) (Y) or not (N)
CAPTURE_OVERHEAD VARCHAR2(1)   Indicates whether the session is executing capture code (Y) or not (N)
REPLAY_OVERHEAD VARCHAR2(1)   Indicates whether the session is executing replay code (Y) or not (N)
IS_CAPTURED VARCHAR2(1)   Indicates whether the session is being captured (Y) or not (N)
IS_REPLAYED VARCHAR2(1)   Indicates whether the session is being replayed (Y) or not (N)
SERVICE_HASH NUMBER   Hash that identifies the Service
PROGRAM VARCHAR2(64)   Name of the operating system program
MODULE VARCHAR2(64)   Name of the currently executing module as set by the DBMS_APPLICATION_INFO.SET_MODULE procedure
ACTION VARCHAR2(64)   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
MACHINE VARCHAR2(64)   Client's operating system machine name
PORT NUMBER   Client port number
ECID VARCHAR2(64)   Execution context identifier (sent by Application Server)
DBREPLAY_FILE_ID NUMBER   If the session is being captured or replayed, then DBREPLAY_FILE_ID is the file ID for the workload capture or workload replay; otherwise it is NULL.
DBREPLAY_CALL_COUNTER NUMBER   If the session is being captured or replayed, then DBREPLAY_CALL_COUNTER is the call counter of the user call that is being captured or replayed; otherwise it is NULL.
TM_DELTA_TIME NUMBER   Time interval (in microseconds) over which TM_DELTA_CPU_TIME and TM_DELTA_DB_TIME are accumulated
TM_DELTA_CPU_TIME NUMBER   Amount of time this session spent on CPU over the last TM_DELTA_TIME microseconds
TM_DELTA_DB_TIME NUMBER   Amount of time spent by this session in database calls over the last TM_DELTA_TIME microseconds
DELTA_TIME NUMBER   Time interval (in microseconds) since the last time this session was sampled or created, over which the next five statistics are accumulated
DELTA_READ_IO_REQUESTS NUMBER   Number of read I/O requests made by this session over the last DELTA_TIME microseconds
DELTA_WRITE_IO_REQUESTS NUMBER   Number of write I/O requests made by this session over the last DELTA_TIME microseconds
DELTA_READ_IO_BYTES NUMBER   Number of I/O bytes read by this session over the last DELTA_TIME microseconds
DELTA_WRITE_IO_BYTES NUMBER   Number of I/O bytes written by this session over the last DELTA_TIME microseconds
DELTA_INTERCONNECT_IO_BYTES NUMBER   Number of I/O bytes sent over the I/O interconnect over the last DELTA_TIME microseconds
PGA_ALLOCATED NUMBER   Amount of PGA memory (in bytes) consumed by this session at the time this sample was taken
TEMP_SPACE_ALLOCATED NUMBER   Amount of TEMP memory (in bytes) consumed by this session at the time this sample was taken
DBOP_NAME VARCHAR2(64)   Database operation name. If the type is SQL, the DBOP_NAME will be NULL.
DBOP_EXEC_ID NUMBER   Database operation execution identifier for the current execution. If the type is SQL, the DBOP_EXEC_ID will be NULL.
CON_DBID NUMBER   The database ID of the PDB for the sampled session
CON_ID NUMBER   The ID of the container that CON_DBID identifies. 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


See Also: