Note
- 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 history of active sessions.
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 on the server. |
| 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 session being sampled. |
| SESSION_ID | NUMBER | NO | The ID of the session being sampled. For V4.2.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 | bigint(20) | NO | The ID of the plan in the plan cache to which the sample belongs. This ID is used to associate the sample 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 ID of the waiting event. This ID is used to associate the sample with other tables. |
| EVENT_ID | NUMBER | NO | The ID of the current waiting event.
NoteThis column is available starting with V4.2.2. |
| P1TEXT | VARCHAR2(64) | NO | The name of parameter 1 of the waiting event. This 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. This 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. This 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 to associate the sample with other tables. |
| TIME_WAITED | NUMBER | NO | The total waiting time of the waiting event, in microseconds (us). |
| SQL_PLAN_LINE_ID | NUMBER | NO | The ID of the SQL operator in the SQL plan at the time when the sample was taken. |
| GROUP_ID | NUMBER | NO | The group information of the sample point.
NoteThis column is available starting with V4.2.3. |
| PLAN_HASH | NUMBER | NO | The plan hash of the SQL statement being executed.
NoteThis column is available starting with V4.2.4. |
| THREAD_ID | NUMBER | NO | The ID of the thread to which the current active session belongs.
NoteThis column is available starting with V4.2.4. |
| STMT_TYPE | NUMBER | NO | The type of the SQL statement being executed by the current active session.
NoteThis column is available starting with V4.2.4. |
| TIME_MODEL | NUMBER | NO | The time model information, which is a collection of all IN_XXX fields (such as IN_PARSE and IN_PL_PARSE).
NoteThis column is available starting with V4.2.4. |
| IN_PARSE | VARCHAR2(1) | NO | Indicates whether the session is parsing an SQL statement at the time when the sample was taken. |
| IN_PL_PARSE | VARCHAR2(1) | NO | Indicates whether the session is parsing an SQL PL statement at the time when the sample was taken. |
| IN_PLAN_CACHE | VARCHAR2(1) | NO | Indicates whether the session is matching a plan in the plan cache at the time when the sample was taken. |
| IN_SQL_OPTIMIZE | VARCHAR2(1) | NO | Indicates whether the session is optimizing an SQL statement at the time when the sample was taken. |
| IN_SQL_EXECUTION | VARCHAR2(1) | NO | Indicates whether the session is executing an SQL statement at the time when the sample was taken. |
| IN_PX_EXECUTION | VARCHAR2(1) | NO | Indicates whether the session is executing an SQL statement in parallel at the time when the sample was taken. 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 the session is retrieving an auto-increment column value or a sequence value at the time when the sample was taken. |
| IN_COMMITTING | VARCHAR2(1) | NO | Indicates whether the current sample point is in the transaction commit stage.
NoteThis column is available starting with V4.2.1. |
| IN_STORAGE_READ | VARCHAR2(1) | NO | Indicates whether the current sample point is in the storage read stage.
NoteThis column is available starting with V4.2.1. |
| IN_STORAGE_WRITE | VARCHAR2(1) | NO | Indicates whether the current 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 current 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 current sampling point is in the storage push-down execution phase.
NoteThis column is available starting with V4.2.2. |
| IN_RPC_ENCODE | VARCHAR2(1) | NO | Indicates whether the current SQL is being serialized.
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_RPC_DECODE | VARCHAR2(1) | NO | Indicates whether the current SQL is being deserialized.
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_CONNECTION_MGR | VARCHAR2(1) | NO | Indicates whether the current SQL is establishing a connection.
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| PROGRAM | VARCHAR2(64) | NO | The name of the program being executed at the current sampling point:
NoteThis column is available starting with V4.2.2. |
| MODULE | VARCHAR2(64) | NO | The MODULE value recorded during sampling, set by the DBMS_APPLICATION_INFO.SET_MODULE package.
NoteThis column can be set starting with V4.2.3. |
| ACTION | VARCHAR2(64) | NO | The ACTION value recorded during sampling, set by the DBMS_APPLICATION_INFO.SET_ACTION package.
NoteThis column can be set starting with V4.2.3. |
| CLIENT_ID | VARCHAR2(64) | NO | The CLIENT_ID value recorded during sampling, set by the DBMS_APPLICATION_INFO.set_identifier package.
NoteThis column can be set starting with V4.2.3. |
| 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.
NoteThis column is available starting with V4.2.2. |
| TM_DELTA_CPU_TIME | NUMBER | NO | The amount of time spent on the CPU during the past TM_DELTA_TIME period.
NoteThis column is available starting with V4.2.2. |
| TM_DELTA_DB_TIME | NUMBER | NO | The amount of time spent on database calls during the past TM_DELTA_TIME period.
NoteThis column is available starting with V4.2.2. |
| TOP_LEVEL_SQL_ID | CHAR(32) | NO | The ID of the top-level SQL statement.
NoteThis column is available starting with V4.2.2. |
| IN_PLSQL_COMPILATION | VARCHAR2(1) | NO | The PL compilation status: Y/N
NoteThis column is available starting with V4.2.2. |
| IN_PLSQL_EXECUTION | VARCHAR2(1) | NO | The PL execution status: Y/N
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_OBJECT_ID | NUMBER | NO | The OBJECT ID of the top-level PL statement.
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_SUBPROGRAM_ID | NUMBER | NO | The Sub project ID of the top-level PL statement.
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The Sub project name of the top-level PL statement.
NoteThis column is available starting with V4.2.2. |
| PLSQL_OBJECT_ID | NUMBER | NO | The ID of the PL statement currently being executed.
NoteThis column is available starting with V4.2.2. |
| PLSQL_SUBPROGRAM_ID | NUMBER | NO | The ID of the PL subprogram currently being executed.
NoteThis column is available starting with V4.2.2. |
| PLSQL_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The name of the PL subprogram currently being executed.
NoteThis column is available starting with V4.2.2. |
| BLOCKING_SESSION_ID | NUMBER | NO | If the current session is blocked, the session ID of the session that blocks the current session. This column is valid only in lock conflict scenarios and displays the session ID of the session that holds the lock.
Note
|
| TABLET_ID | NUMBER | NO | The ID of the tablet that is being processed by the current SQL statement.
Note
|
| PROXY_SID | NUMBER | NO | The ID of the proxy session.
Note
|
| TX_ID | NUMBER | NO | The ID of the current transaction.
Note
|
| DELTA_READ_IO_REQUESTS | NUMBER | NO | The number of reads between two samples.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_READ_IO_BYTES | NUMBER | NO | The total size of files read between two samples.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_WRITE_IO_REQUESTS | NUMBER | NO | The number of writes between two samples.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_WRITE_IO_BYTES | NUMBER | NO | The total size of files written between two samples.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
Sample query
Query the active session history on the current OBServer node.
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: 1920605
SAMPLE_TIME: 04-MAR-25 10.47.24.249256 AM
CON_ID: 1004
USER_ID: 0
SESSION_ID: -9223372036854724899
SESSION_TYPE: BACKGROUND
SESSION_STATE: ON CPU
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: NULL
EVENT: NULL
EVENT_NO: 0
EVENT_ID: NULL
P1TEXT: NULL
P1: 0
P2TEXT: NULL
P2: 0
P3TEXT: NULL
P3: 0
WAIT_CLASS: OTHER
WAIT_CLASS_ID: 100
TIME_WAITED: 0
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 82484
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_LogService
MODULE: LogRestoreService
ACTION: RemoteLogWriter
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 1017412
TM_DELTA_CPU_TIME: 1017412
TM_DELTA_DB_TIME: 1017412
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
BLOCKING_SESSION_ID: NULL
TABLET_ID: NULL
PROXY_SID: -9223372036854724899
TX_ID: NULL
DELTA_READ_IO_REQUESTS: 0
DELTA_READ_IO_BYTES: 0
DELTA_WRITE_IO_REQUESTS: 0
DELTA_WRITE_IO_BYTES: 0
1 row in set (0.030 sec)