Note
This view is available starting with V4.2.1.
Purpose
The DBA_WR_ACTIVE_SESSION_HISTORY view displays the ASH data that has been persisted for the current tenant.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| CLUSTER_ID | NUMBER(38) | NO | The cluster ID. |
| TENANT_ID | NUMBER(38) | NO | The tenant ID. |
| SNAP_ID | NUMBER(38) | NO | The snapshot ID. |
| SVR_IP | VARCHAR2(46) | NO | The IP address of the node. |
| SVR_PORT | NUMBER(38) | NO | The port number of the node. |
| SAMPLE_ID | NUMBER(38) | NO | The sampling ID. |
| SESSION_ID | NUMBER(38) | NO | The ID of the sampled session. For V4.3.x:
|
| SAMPLE_TIME | TIMESTAMP(6) WITH LOCAL TIME ZONE | NO | The sampling time. |
| USER_ID | NUMBER(38) | YES | The user ID of the sampled session. |
| SESSION_TYPE | NUMBER(38) | YES | The session type.
|
| SESSION_STATE | VARCHAR2(7) | NO | The session state at the time of sampling.
|
| SQL_ID | VARCHAR2(32) | YES | The SQL ID. |
| TRACE_ID | VARCHAR2(64) | YES | The TRACE_ID. |
| EVENT_NO | NUMBER(38) | YES | The internal number of the waiting event, which is used for cross-table queries. |
| EVENT_ID | NUMBER | YES | The ID of the current waiting event.
Note
|
| TIME_WAITED | NUMBER(38) | YES | The total waiting time of the waiting event, in microseconds (us). |
| P1 | NUMBER(38) | YES | The value of the first parameter of the waiting event. |
| P2 | NUMBER(38) | YES | The value of the second parameter of the waiting event. |
| P3 | NUMBER(38) | YES | The value of the third parameter of the waiting event. |
| SQL_PLAN_LINE_ID | NUMBER(38) | YES | The ID of the SQL operator corresponding to the sampled SQL statement. If no corresponding operator exists, the value is NULL. |
| PLAN_HASH | NUMBER(38) | YES | The plan hash corresponding to the executed SQL statement.
Note
|
| THREAD_ID | NUMBER(38) | YES | The ID of the thread where the current active session resides.
Note
|
| STMT_TYPE | NUMBER(38) | YES | The SQL type of the current active session.
Note
|
| GROUP_ID | NUMBER(38) | YES | The ID of the resource group to which the session belongs.
Note
|
| TX_ID | NUMBER(38) | YES | The ID of the current transaction.
Note
|
| BLOCKING_SESSION_ID | NUMBER(38) | YES | If the current session is blocked, this field displays the ID of the session that blocks the current session. Currently, this field is effective only in lock conflict scenarios and displays the ID of the session that holds the lock.
Note
|
| TIME_MODEL | NUMBER(38) | YES | Information about the time model. |
| IN_PARSE | VARCHAR2(1) | NO | Indicates whether the current session is performing SQL parsing at the time of sampling. |
| IN_PL_PARSE | VARCHAR2(1) | NO | Indicates whether the current session is performing SQL PL parsing at the time of sampling. |
| IN_PLAN_CACHE | VARCHAR2(1) | NO | Indicates whether the current session is performing plan cache operations at the time of sampling. |
| IN_SQL_OPTIMIZE | VARCHAR2(1) | NO | Indicates whether SQL optimization is being performed in the current session during sampling. |
| IN_SQL_EXECUTION | VARCHAR2(1) | NO | Indicates whether SQL execution is being performed in the current session during sampling. |
| IN_PX_EXECUTION | VARCHAR2(1) | NO | Indicates whether parallel execution is being performed in the current session during sampling. If the session is in this state, it must also be in the IN_SQL_EXECUTION state. |
| IN_SEQUENCE_LOAD | VARCHAR2(1) | NO | Indicates whether a sequence value is being fetched in the current session during sampling. |
| IN_COMMITTING | VARCHAR2(1) | NO | Indicates whether the current sampling point is in the transaction commit phase. |
| IN_STORAGE_READ | VARCHAR2(1) | NO | Indicates whether the current sampling point is in the storage read phase. |
| IN_STORAGE_WRITE | VARCHAR2(1) | NO | Indicates whether the current sampling point is in the storage write phase. |
| IN_REMOTE_DAS_EXECUTION | VARCHAR2(1) | NO | Indicates whether the current sampling point is in the DAS remote execution phase. |
| IN_FILTER_ROWS | VARCHAR2(1) | NO | Indicates whether the current sampling point is in the storage push-down execution phase
Note
|
| IN_RPC_ENCODE | VARCHAR2(1) | NO | Indicates whether the current SQL is undergoing serialization. |
| IN_RPC_DECODE | VARCHAR2(1) | NO | Indicates whether the current SQL is undergoing deserialization. |
| IN_CONNECTION_MGR | VARCHAR2(1) | NO | Indicates whether the current SQL is undergoing connection establishment. |
| PROGRAM | VARCHAR2(64) | YES | The name of the program being executed at the current sampling point:
Note
|
| MODULE | VARCHAR2(64) | YES | The MODULE value recorded in the current session at the sampling point. It is set by using the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | VARCHAR2(64) | YES | The ACTION value recorded in the current session at the sampling point. It is set by using the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | VARCHAR2(64) | YES | The CLIENT_ID value recorded in the current session at the sampling point. It is set by using the DBMS_SESSION.set_identifier package. |
| BACKTRACE | VARCHAR2(512) | YES | An auxiliary debugging field used to record the code call stack at the time of the event. |
| PLAN_ID | NUMBER(38) | YES | The plan ID of the sampled SQL in the plan cache. This field is used to associate the sampling point with the plan. |
| TM_DELTA_TIME | NUMBER | YES | The time interval for calculating the time model, in microseconds
Note
|
| TM_DELTA_CPU_TIME | NUMBER | YES | The amount of time spent on the CPU during the TM_DELTA_TIME time period in the past
Note
|
| TM_DELTA_DB_TIME | NUMBER | YES | The amount of time spent on database calls during the TM_DELTA_TIME time period in the past
Note
|
| TOP_LEVEL_SQL_ID | CHAR(32) | YES | The top-level SQL ID
Note
|
| IN_PLSQL_COMPILATION | VARCHAR2(1) | NO | The PL compilation status: Y/N
Note
|
| IN_PLSQL_EXECUTION | VARCHAR2(1) | NO | The PL execution status: Y/N
Note
|
| PLSQL_ENTRY_OBJECT_ID | NUMBER | YES | The OBJECT ID of the top-level PL
Note
|
| PLSQL_ENTRY_SUBPROGRAM_ID | NUMBER | YES | The ID of the top-level PL subproject.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_NAME | VARCHAR2(32) | YES | The name of the top-level PL subproject.
Note
|
| PLSQL_OBJECT_ID | NUMBER | YES | The ID of the PL object that is currently being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | NUMBER | YES | The ID of the PL subprogram that is currently being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | VARCHAR2(32) | YES | The name of the PL subprogram that is currently being executed.
Note
|
| DELTA_READ_IO_REQUESTS | NUMBER(38) | YES | The number of read requests between two samples.
Note
|
| DELTA_READ_IO_BYTES | NUMBER(38) | YES | The total size of read files between two samples.
Note
|
| DELTA_WRITE_IO_REQUESTS | NUMBER(38) | YES | The number of write requests between two samples.
Note
|
| DELTA_WRITE_IO_BYTES | NUMBER(38) | YES | The total size of write files between two samples.
Note
|
| TABLET_ID | NUMBER(38) | YES | The ID of the tablet that is currently being processed by the SQL statement.
Note
|
| PROXY_SID | NUMBER(38) | YES | The ID of the proxy session.
Note
|
| WEIGHT | NUMBER(38) | YES | The number of occurrences of the same tenant and action within the time range corresponding to the WR record.
NoteFor V4.4.x, this field is available starting with V4.4.2. |
Sample query
Query the ASH data that is persisted for the current tenant.
obclient(SYS@oracle001)[SYS]> SELECT * FROM SYS.DBA_WR_ACTIVE_SESSION_HISTORY WHERE ROWNUM <= 1\G
The query result is as follows:
*************************** 1. row ***************************
CLUSTER_ID: 10001
TENANT_ID: 1004
SNAP_ID: 1
SVR_IP: xx.xx.xx.xx
SVR_PORT: 2882
SAMPLE_ID: 1470
SESSION_ID: 4611686018427432172
SAMPLE_TIME: 29-DEC-25 03.50.38.981969 PM
USER_ID: 200001
SESSION_TYPE: 1
SESSION_STATE: ON CPU
SQL_ID: 457F17B0D31A6AF5A6AB7E9BFA4BA82D
TRACE_ID: YB42AC1E87D9-00064712649AEE5B-0-0
EVENT_NO: 0
EVENT_ID: NULL
TIME_WAITED: 0
P1: 0
P2: 0
P3: 0
SQL_PLAN_LINE_ID: NULL
PLAN_HASH: 18083108410733035737
THREAD_ID: 92883
STMT_TYPE: 1
GROUP_ID: 0
TX_ID: NULL
BLOCKING_SESSION_ID: NULL
TIME_MODEL: 0
IN_PARSE: N
IN_PL_PARSE: N
IN_PLAN_CACHE: N
IN_SQL_OPTIMIZE: N
IN_SQL_EXECUTION: N
IN_PX_EXECUTION: N
IN_SEQUENCE_LOAD: N
IN_COMMITTING: N
IN_STORAGE_READ: N
IN_STORAGE_WRITE: N
IN_REMOTE_DAS_EXECUTION: N
IN_PLSQL_COMPILATION: N
IN_PLSQL_EXECUTION: N
IN_FILTER_ROWS: N
IN_RPC_ENCODE: N
IN_RPC_DECODE: N
IN_CONNECTION_MGR: N
PROGRAM: T1_RPC_REQUEST
MODULE: LOCAL INNER SQL EXEC
ACTION: NULL_INNER_SQL
CLIENT_ID: NULL
BACKTRACE: NULL
PLAN_ID: 44
TM_DELTA_TIME: 1248
TM_DELTA_CPU_TIME: 1245
TM_DELTA_DB_TIME: 1245
TOP_LEVEL_SQL_ID: NULL
PLSQL_ENTRY_OBJECT_ID: NULL
PLSQL_ENTRY_SUBPROGRAM_ID: NULL
PLSQL_ENTRY_SUBPROGRAM_NAME: NULL
PLSQL_OBJECT_ID: NULL
PLSQL_SUBPROGRAM_ID: NULL
PLSQL_SUBPROGRAM_NAME: NULL
DELTA_READ_IO_REQUESTS: 0
DELTA_READ_IO_BYTES: 0
DELTA_WRITE_IO_REQUESTS: 0
DELTA_WRITE_IO_BYTES: 0
TABLET_ID: NULL
PROXY_SID: 4611686018427432172
1 row in set (0.064 sec)