Note
- For V4.3.x, this view was renamed to V$OB_ACTIVE_SESSION_HISTORY starting from V4.3.5. For V4.2.x, this view was renamed to V$OB_ACTIVE_SESSION_HISTORY starting from V4.2.2.
- This view is available starting with V4.0.0.
Purpose
This view displays the active session history of the current OBServer node in the current tenant.
Columns
| Column | Type | Nullable? | Description |
|---|---|---|---|
| SVR_IP | VARCHAR2(46) | NO | The IP address of the server to which the sample belongs. |
| SVR_PORT | NUMBER | NO | The port number of the server to which the sample belongs. |
| SAMPLE_ID | NUMBER | NO | The unique ID of the sample. |
| SAMPLE_TIME | TIMESTAMP(6) | NO | The time when the sample was taken. |
| CON_ID | NUMBER | NO | The tenant ID. |
| USER_ID | NUMBER | NO | The ID of the user of the sampled session. |
| SESSION_ID | NUMBER | NO | The ID of the sampled session. For V4.3.x versions:
|
| SESSION_TYPE | VARCHAR2(10) | NO | The session type: |
| SESSION_STATE | VARCHAR2(7) | NO | The session state:EVENT field. |
| SQL_ID | VARCHAR2(32) | NO | The SQL ID. |
| PLAN_ID | NUMBER | NO | The plan ID of the sampled SQL in the plan cache. This ID is used to associate the sampling point with the plan. |
| TRACE_ID | VARCHAR2(64) | NO | The trace ID of the operator. |
| EVENT | VARCHAR2(64) | NO | The description of the waiting event. |
| EVENT_NO | NUMBER | NO | The internal number of the waiting event. This number is used for cross-table queries. |
| EVENT_ID | NUMBER | NO | The ID of the current waiting event.
Note
|
| P1TEXT | VARCHAR2(64) | NO | The name of parameter 1 of the waiting event. The name varies depending on the value of the EVENT field. |
| P1 | NUMBER | NO | The value of parameter 1 of the waiting event. |
| P2TEXT | VARCHAR2(64) | NO | The name of parameter 2 of the waiting event. The name varies depending on the value of the EVENT field. |
| P2 | NUMBER | NO | The value of parameter 2 of the waiting event. |
| P3TEXT | VARCHAR2(64) | NO | The name of parameter 3 of the waiting event. The name varies depending on the value of the EVENT field. |
| P3 | NUMBER | NO | The value of parameter 3 of the waiting event. |
| WAIT_CLASS | VARCHAR2(64) | NO | The type of the waiting event. |
| WAIT_CLASS_ID | NUMBER | NO | The ID of the type of the waiting event. This ID is used for cross-table queries. |
| TIME_WAITED | NUMBER | NO | The total waiting time of the waiting event, in microseconds (us). |
| SQL_PLAN_LINE_ID | NUMBER | NO | The number of the SQL operator in the SQL plan at the time the sample was taken. |
| GROUP_ID | NUMBER | NO | The ID of the resource group to which the sample belongs. |
| PLAN_HASH | NUMBER | NO | The plan hash of the executed SQL statement. |
| THREAD_ID | NUMBER | NO | The ID of the thread to which the active session belongs. |
| STMT_TYPE | NUMBER | NO | The SQL type of the active session. |
| TIME_MODEL | NUMBER | NO | time model information, which is a collection of data from all IN_XXX fields (such as IN_PARSE, IN_PL_PARSE, and so on). |
| IN_PARSE | VARCHAR2(1) | NO | Indicates whether the session is performing SQL parsing at the sampling time. |
| IN_PL_PARSE | VARCHAR2(1) | NO | Indicates whether the session is performing SQL PL parsing at the sampling time. |
| IN_PLAN_CACHE | VARCHAR2(1) | NO | Indicates whether the session is performing plan cache matching at the sampling time. |
| IN_SQL_OPTIMIZE | VARCHAR2(1) | NO | Indicates whether the session is performing SQL parsing optimization at the sampling time. |
| IN_SQL_EXECUTION | VARCHAR2(1) | NO | Indicates whether the session is performing SQL execution at the sampling time. |
| IN_PX_EXECUTION | VARCHAR2(1) | NO | Indicates whether the session is performing SQL parallel execution at the sampling time. When the session is in this state, it must also be in the IN_SQL_EXECUTION state. |
| IN_SEQUENCE_LOAD | VARCHAR2(1) | NO | Indicates whether the session is performing incremental column or SEQUENCE value retrieval at the sampling time. |
| IN_COMMITTING | VARCHAR2(1) | NO | Indicates whether the sampling point is in the transaction commit phase.
NoteThis column is available starting with V4.2.1. |
| IN_STORAGE_READ | VARCHAR2(1) | NO | Indicates whether the sampling point is in the storage read phase.
NoteThis column is available starting with V4.2.1. |
| IN_STORAGE_WRITE | VARCHAR2(1) | NO | Indicates whether the sampling point is in the storage write phase.
NoteThis column is available starting with V4.2.1. |
| IN_REMOTE_DAS_EXECUTION | VARCHAR2(1) | NO | Indicates whether the sampling point is in the DAS remote execution phase.
NoteThis column is available starting with V4.2.1. |
| IN_FILTER_ROWS | VARCHAR2(1) | NO | Indicates whether the sampling point is in the storage push-down execution phase. |
| IN_RPC_ENCODE | VARCHAR2(1) | NO | Indicates the serialization operation being performed by the current SQL statement. |
| IN_RPC_DECODE | VARCHAR2(1) | NO | Indicates the deserialization operation being performed by the current SQL statement. |
| IN_CONNECTION_MGR | VARCHAR2(1) | NO | Indicates the connection establishment operation being performed by the current SQL statement. |
| PROGRAM | VARCHAR2(64) | NO | The name of the program being executed at the sampling point:
|
| MODULE | VARCHAR2(64) | NO | The MODULE value recorded by the session at the sampling time. You can set this value by using the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | VARCHAR2(64) | NO | The ACTION value recorded by the session at the sampling time. You can set this value by using the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | VARCHAR2(64) | NO | The CLIENT_ID value recorded by the session at the sampling time. You can set this value by using the DBMS_SESSION.set_identifier package. |
| BACKTRACE | VARCHAR2(512) | NO | An auxiliary debugging field used to record the code call stack at the time of the event. The value of this field is always NULL. |
| TM_DELTA_TIME | NUMBER | NO | The time interval for calculating the time model, in microseconds.
Note
|
| TM_DELTA_CPU_TIME | NUMBER | NO | The amount of time spent on the CPU during the TM_DELTA_TIME period.
Note
|
| TM_DELTA_DB_TIME | NUMBER | NO | The amount of time spent in database calls over the last TM_DELTA_TIME period.
Note
|
| TOP_LEVEL_SQL_ID | CHAR(32) | NO | The ID of the top-level SQL statement.
Note
|
| IN_PLSQL_COMPILATION | VARCHAR2(1) | NO | The PL compilation status: Y or N.
Note
|
| IN_PLSQL_EXECUTION | VARCHAR2(1) | NO | The PL execution status: Y or N.
Note
|
| PLSQL_ENTRY_OBJECT_ID | NUMBER | NO | The object ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_ID | NUMBER | NO | The subprogram ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The subprogram name of the top-level PL statement.
Note
|
| PLSQL_OBJECT_ID | NUMBER | NO | The object ID of the PL statement being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | NUMBER | NO | The subprogram ID of the PL statement being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The subprogram name of the PL statement being executed.
Note
|
| TX_ID | NUMBER | NO | The ID of the current transaction.
Note
|
| BLOCKING_SESSION_ID | NUMBER | NO | If the current session is blocked, the ID of the session that is blocking the current session. This column is valid only in lock conflict scenarios, and it displays the ID of the session that holds the lock.
Note
|
| TABLET_ID | NUMBER | NO | The ID of the tablet being processed by the current SQL statement.
Note
|
| PROXY_SID | NUMBER | NO | The ID of the proxy session.
Note
|
| DELTA_READ_IO_REQUESTS | NUMBER(38) | NO | The number of read requests between two samples.
Note
|
| DELTA_READ_IO_BYTES | NUMBER(38) | NO | The total size of read files between two samples.
Note
|
| DELTA_WRITE_IO_REQUESTS | NUMBER(38) | NO | The number of write requests between two samples.
Note
|
| DELTA_WRITE_IO_BYTES | NUMBER(38) | NO | The total size of written files between two samples.
Note
|
Sample query
Query the history of active sessions on the current OBServer node in the current tenant.
obclient [SYS]> SELECT * FROM SYS.V$ACTIVE_SESSION_HISTORY WHERE ROWNUM <= 1\G
The query result is as follows:
*************************** 1. row ***************************
SVR_IP: xx.xx.xx.xx
SVR_PORT: 2882
SAMPLE_ID: 1164438
SAMPLE_TIME: 28-APR-25 05.24.08.684204 PM
CON_ID: 1004
USER_ID: 200001
SESSION_ID: 2305843009213714805
SESSION_TYPE: BACKGROUND
SESSION_STATE: WAITING
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: YB42AC1E87E9-XXXXXXXXXXXXXXXXXX-0-0
EVENT: latch: config lock wait
EVENT_NO: 132
EVENT_ID: 40
P1TEXT: address
P1: 140013133706048
P2TEXT: number
P2: 1073791886
P3TEXT: tries
P3: 0
WAIT_CLASS: CONCURRENCY
WAIT_CLASS_ID: 104
TIME_WAITED: 18808
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 51113
STMT_TYPE: 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_FILTER_ROWS: N
IN_RPC_ENCODE: N
IN_RPC_DECODE: N
IN_CONNECTION_MGR: N
PROGRAM: T1004_TimerWK
MODULE: TimerWK
ACTION: NULL
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 74264957
TM_DELTA_CPU_TIME: 285828
TM_DELTA_DB_TIME: 2398159
TOP_LEVEL_SQL_ID: NULL
IN_PLSQL_COMPILATION: N
IN_PLSQL_EXECUTION: N
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
TX_ID: NULL
BLOCKING_SESSION_ID: NULL
TABLET_ID: NULL
PROXY_SID: 2305843009213714805
DELTA_READ_IO_REQUESTS: 0
DELTA_READ_IO_BYTES: 0
DELTA_WRITE_IO_REQUESTS: 0
DELTA_WRITE_IO_BYTES: 0
References
After you obtain the history of active sessions, you can generate an ASH report as needed for analysis. For more information about ASH, see ASH reports.