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`	`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`^Foot 1	`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`^Foot 2	`VARCHAR2(48)`		Name of the currently executing module as set by the `DBMS_APPLICATION_INFO.SET_MODULE` procedure
`ACTION`^Footref 2	`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
`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`^Footref 1	`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`^Footref 1	`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

^Footnote 1This column is available starting with Oracle Database 11g Release 2 (11.2.0.2).

^Footnote 2The datatype of this column is VARCHAR2(64) starting with Oracle Database 11g Release 2 (11.2.0.2).