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 | varchar(46) | NO | The IP address of the server to which the sample belongs. |
| SVR_PORT | bigint(20) | NO | The port number of the server to which the sample belongs. |
| SAMPLE_ID | bigint(20) | NO | The unique ID of the sample. |
| SAMPLE_TIME | datetime | NO | The time when the sample was collected. |
| CON_ID | bigint(20) | NO | The tenant ID. |
| USER_ID | bigint(20) | NO | The ID of the user of the session that was sampled. |
| SESSION_ID | bigint(20) | NO | The ID of the session that was sampled. For V4.2.x:
|
| SESSION_TYPE | varchar(10) | NO | The session type. |
| SESSION_STATE | varchar(7) | NO | The session state. EVENT field. |
| SQL_ID | varchar(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. |
| EVENT | varchar(64) | NO | The description of the wait event. |
| EVENT_NO | bigint(20) | NO | The internal ID of the wait event. This ID is used for cross-table queries. |
| EVENT_ID | bigint(20) | NO | The ID of the current wait event.
NoteThis field is available starting with V4.2.2. |
| P1TEXT | varchar(64) | NO | The name of the first parameter of the wait event. The name varies with the value of the EVENT field. |
| P1 | bigint(20) | NO | The value of the first parameter of the wait event. |
| P2TEXT | varchar(64) | NO | The name of the second parameter of the wait event. The name varies with the value of the EVENT field. |
| P2 | bigint(20) | NO | The value of the second parameter of the wait event. |
| P3TEXT | varchar(64) | NO | The name of the third parameter of the wait event. The name varies with the value of the EVENT field. |
| P3 | bigint(20) | NO | The value of the third parameter of the wait event. |
| WAIT_CLASS | varchar(64) | NO | The type to which the wait event belongs. |
| WAIT_CLASS_ID | bigint(20) | NO | The ID of the type to which the wait event belongs. This ID is used for cross-table queries. |
| TIME_WAITED | bigint(20) | NO | The total wait time of the wait event, in microseconds (us). |
| SQL_PLAN_LINE_ID | bigint(20) | NO | The ID of the SQL operator in the SQL plan at the time when the sample was collected. |
| GROUP_ID | bigint(20) | NO | The group information of the sample point
NoteThis field is available starting with V4.2.3. |
| PLAN_HASH | bigint(20) unsigned | NO | The plan_hash of the current SQL statement
NoteThis field is available starting with V4.2.4. |
| THREAD_ID | bigint(20) | NO | The ID of the thread to which the current active session belongs
NoteThis field is available starting with V4.2.4. |
| STMT_TYPE | bigint(20) | NO | The type of the SQL statement of the current active session
NoteThis field is available starting with V4.2.4. |
| TIME_MODEL | bigint(20) | NO | The time model information, which is a collection of data from all IN_XXX fields (such as IN_PARSE and IN_PL_PARSE).
NoteThis field is available starting with V4.2.4. |
| IN_PARSE | varchar(1) | NO | Indicates whether the session is parsing an SQL statement at the time when the sample was collected. |
| IN_PL_PARSE | varchar(1) | NO | Indicates whether the session is parsing a PL/SQL statement at the time when the sample was collected. |
| IN_PLAN_CACHE | varchar(1) | NO | Indicates whether the session is matching a plan in the plan cache at the time when the sample was collected. |
| IN_SQL_OPTIMIZE | varchar(1) | NO | Indicates whether the session is optimizing an SQL statement at the time when the sample was collected. |
| IN_SQL_EXECUTION | varchar(1) | NO | Indicates whether the session is executing an SQL statement at the time when the sample was collected. |
| IN_PX_EXECUTION | varchar(1) | NO | Indicates whether the session is executing an SQL statement in parallel at the time when the sample was collected. If the session is in this state, it must also be in the IN_SQL_EXECUTION state. |
| IN_SEQUENCE_LOAD | varchar(1) | NO | Indicates whether the session is fetching values from an auto-increment column or a sequence at the time when the sample was collected. |
| IN_COMMITTING | varchar(1) | NO | Indicates whether the sample point is in the transaction commit phase.
NoteThis field is available starting with V4.2.1. |
| IN_STORAGE_READ | varchar(1) | NO | Indicates whether the sample point is in the storage read phase.
NoteThis field is available starting with V4.2.1. |
| IN_STORAGE_WRITE | varchar(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 | varchar(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 | varchar(1) | NO | Indicates whether the current sampling point is in the storage pushdown execution phase
NoteThis column is available starting with V4.2.2. |
| IN_RPC_ENCODE | varchar(1) | NO | Indicates whether the current SQL is in the serialization phase
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_RPC_DECODE | varchar(1) | NO | Indicates whether the current SQL is in the deserialization phase
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_CONNECTION_MGR | varchar(1) | NO | Indicates whether the current SQL is in the connection establishment phase
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| PROGRAM | varchar(64) | NO | The name of the program being executed at the current sampling point:
NoteThis column is available starting with V4.2.2. |
| MODULE | varchar(64) | NO | The MODULE value recorded at the time of sampling, which is set by using the DBMS_APPLICATION_INFO.SET_MODULE package.
NoteThis column is available starting with V4.2.3. |
| ACTION | varchar(64) | NO | The ACTION value recorded at the time of sampling, which is set by using the DBMS_APPLICATION_INFO.SET_ACTION package.
NoteThis column is available starting with V4.2.3. |
| CLIENT_ID | varchar(64) | NO | The CLIENT_ID value recorded at the time of sampling, which is set by using the DBMS_APPLICATION_INFO.set_identifier package.
NoteThis column is available starting with V4.2.3. |
| BACKTRACE | varchar(512) | NO | An auxiliary debugging column used to record the code call stack at the time of the event. The value of this column is always NULL. |
| TM_DELTA_TIME | bigint(20) | NO | The time interval for calculating the time model, in microseconds
NoteThis column is available starting with V4.2.2. |
| TM_DELTA_CPU_TIME | bigint(20) | NO | The amount of time spent on the CPU during the TM_DELTA_TIME period in the past
NoteThis column is available starting with V4.2.2. |
| TM_DELTA_DB_TIME | bigint(20) | NO | The amount of time spent on database calls during the TM_DELTA_TIME period in the past
NoteThis column is available starting with V4.2.2. |
| TOP_LEVEL_SQL_ID | varchar(32) | NO | The ID of the top-level SQL statement
NoteThis column is available starting with V4.2.2. |
| IN_PLSQL_COMPILATION | varchar(1) | NO | The PL compilation status: Y/N
NoteThis column is available starting with V4.2.2. |
| IN_PLSQL_EXECUTION | varchar(1) | NO | The PL execution status: Y/N
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_OBJECT_ID | bigint(20) | NO | The OBJECT ID of the top-level PL statement
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_SUBPROGRAM_ID | bigint(20) | NO | The subprogram ID of the top-level PL statement
NoteThis column is available starting with V4.2.2. |
| PLSQL_ENTRY_SUBPROGRAM_NAME | varchar(32) | NO | The subprogram name of the top-level PL statement
NoteThis column is available starting with V4.2.2. |
| PLSQL_OBJECT_ID | bigint(20) | NO | The ID of the PL statement being executed
NoteThis column is available starting with V4.2.2. |
| PLSQL_SUBPROGRAM_ID | bigint(20) | NO | The subprogram ID of the PL statement being executed
NoteThis column is available starting with V4.2.2. |
| PLSQL_SUBPROGRAM_NAME | varchar(32) | NO | The name of the PL subprogram currently being executed.
NoteThis column is available starting with V4.2.2. |
| BLOCKING_SESSION_ID | bigint(20) | NO | If the current session is blocked, displays the session ID of the session that is blocking the current session. This column is effective only in lock conflict scenarios, and displays the session ID that holds the lock.
Note
|
| TABLET_ID | bigint(20) | NO | The ID of the tablet that is being processed by the current SQL statement.
Note
|
| PROXY_SID | bigint(20) | NO | The ID of the proxy session.
Note
|
| TX_ID | bigint(20) | NO | The ID of the current transaction.
Note
|
| DELTA_READ_IO_REQUESTS | bigint(20) | NO | The number of read requests between two sampling intervals.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_READ_IO_BYTES | bigint(20) | NO | The total size of files read between two sampling intervals.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_WRITE_IO_REQUESTS | bigint(20) | NO | The number of write requests between two sampling intervals.
NoteFor V4.2.x, this column is available starting with V4.2.5 BP3. |
| DELTA_WRITE_IO_BYTES | bigint(20) | NO | The total size of files written between two sampling intervals.
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 [oceanbase]> SELECT * FROM oceanbase.V$ACTIVE_SESSION_HISTORY limit 1 \G
The query result is as follows:
*************************** 1. row ***************************
SVR_IP: xx.xx.xx.xx
SVR_PORT: 2882
SAMPLE_ID: 1919921
SAMPLE_TIME: 2025-03-04 10:45:34.101314
CON_ID: 1002
USER_ID: 0
SESSION_ID: -9223372036854729604
SESSION_TYPE: BACKGROUND
SESSION_STATE: ON CPU
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: NULL
EVENT:
EVENT_NO: 0
EVENT_ID: NULL
P1TEXT:
P1: 0
P2TEXT:
P2: 0
P3TEXT:
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: 82045
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: T1002_LogService
MODULE: LogRestoreService
ACTION: RemoteLogWriter
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 1017670
TM_DELTA_CPU_TIME: 1017670
TM_DELTA_DB_TIME: 1017670
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: -9223372036854729604
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 (0.021 sec)