Note
- For V4.3.x versions, this view was renamed to V$OB_ACTIVE_SESSION_HISTORY starting from V4.3.5. For V4.2.x versions, this view was renamed to V$OB_ACTIVE_SESSION_HISTORY starting from V4.2.2.
- This view is available starting with V4.0.0.
Purpose
The V$ACTIVE_SESSION_HISTORY view displays the active session history of the current OBServer node in all tenants.
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 | timestamp(6) | NO | The sampling time. |
| CON_ID | bigint(20) | NO | The tenant ID. |
| USER_ID | bigint(20) | NO | The ID of the user of the session being sampled. |
| SESSION_ID | bigint(20) | NO | The ID of the session being sampled. For V4.3.x versions:
|
| SESSION_TYPE | varchar(10) | NO | The session type.
|
| SESSION_STATE | varchar(7) | NO | The session state.
|
| SQL_ID | varchar(32) | NO | The SQL ID. |
| PLAN_ID | bigint(20) | 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 | varchar(64) | NO | The trace ID of the operator. |
| EVENT | varchar(64) | NO | The description of the waiting event. |
| EVENT_NO | bigint(20) | NO | The internal number of the waiting event. This number is used to associate the event with other tables. |
| EVENT_ID | bigint(20) | NO | The ID of the current waiting event.
Note
|
| P1TEXT | varchar(64) | NO | The name of the first parameter of the waiting event. The name varies depending on the value of the EVENT field. |
| P1 | bigint(20) | NO | The value of the first parameter of the waiting event. |
| P2TEXT | varchar(64) | NO | The name of the second parameter of the waiting event. The name varies depending on the value of the EVENT field. |
| P2 | bigint(20) | NO | The value of the second parameter of the waiting event. |
| P3TEXT | varchar(64) | NO | The name of the third parameter of the waiting event. The name varies depending on the value of the EVENT field. |
| P3 | bigint(20) | NO | The value of the third parameter of the waiting event. |
| WAIT_CLASS | varchar(64) | NO | The type of the waiting event. |
| WAIT_CLASS_ID | bigint(20) | NO | The ID of the type of the waiting event. This ID is used to associate the event with other tables. |
| TIME_WAITED | bigint(20) | NO | The total waiting time of the waiting event, in microseconds (us). |
| SQL_PLAN_LINE_ID | bigint(20) | NO | The number of the SQL operator in the SQL plan at the time of sampling. |
| GROUP_ID | bigint(20) | NO | The ID of the resource group to which the sample belongs. |
| PLAN_HASH | bigint(20) unsigned | NO | The plan hash of the SQL command being executed. |
| THREAD_ID | bigint(20) | NO | The ID of the thread to which the active session belongs. |
| STMT_TYPE | bigint(20) | NO | The SQL type of the active session. |
| TIME_MODEL | bigint(20) | NO | The 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 | varchar(1) | NO | Indicates whether the session is performing SQL parsing at the sampling point. |
| IN_PL_PARSE | varchar(1) | NO | Indicates whether the session is performing SQL PL parsing at the sampling point. |
| IN_PLAN_CACHE | varchar(1) | NO | Indicates whether the session is performing plan cache matching at the sampling point. |
| IN_SQL_OPTIMIZE | varchar(1) | NO | Indicates whether the session is performing SQL parsing optimization at the sampling point. |
| IN_SQL_EXECUTION | varchar(1) | NO | Indicates whether the session is performing SQL execution at the sampling point. |
| IN_PX_EXECUTION | varchar(1) | NO | Indicates whether the session is performing SQL parallel execution at the sampling point. 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 retrieving values from an auto-increment column or a SEQUENCE at the sampling point. |
| IN_COMMITTING | varchar(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 | varchar(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 | varchar(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 | varchar(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 | varchar(1) | NO | Indicates whether the sampling point is in the storage pushdown execution phase.
NoteThis column is available starting with V4.2.2. |
| IN_RPC_ENCODE | varchar(1) | NO | The serialization operation being performed by the current SQL statement.
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_RPC_DECODE | varchar(1) | NO | The deserialization operation being performed by the current SQL statement.
NoteThis column is available starting with V4.2.5 for V4.2.x. |
| IN_CONNECTION_MGR | varchar(1) | NO | The connection establishment operation being performed by the current SQL statement.
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 sampling point:
NoteThis column is available starting with V4.2.2. |
| MODULE | varchar(64) | NO | The MODULE value recorded by the session at the sampling point, which is set by using the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | varchar(64) | NO | The ACTION value recorded by the session at the sampling point, which is set by using the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | varchar(64) | NO | The CLIENT_ID value recorded by the session at the sampling point, which is set by using the DBMS_SESSION.set_identifier package. |
| 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 of the time model, in microseconds.
Note
|
| TM_DELTA_CPU_TIME | bigint(20) | NO | The amount of time spent on the CPU in the last TM_DELTA_TIME interval.
Note
|
| TM_DELTA_DB_TIME | bigint(20) | NO | The amount of time spent in database calls in the last TM_DELTA_TIME interval.
Note
|
| TOP_LEVEL_SQL_ID | CHAR(32) | NO | The ID of the top-level SQL statement.
Note
|
| IN_PLSQL_COMPILATION | varchar(1) | NO | The PL compilation status: Y or N.
Note
|
| IN_PLSQL_EXECUTION | varchar(1) | NO | The PL execution status: Y or N.
Note
|
| PLSQL_ENTRY_OBJECT_ID | bigint(20) | NO | The OBJECT ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_ID | bigint(20) | NO | The subprogram ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_NAME | varchar(32) | NO | The subprogram name of the top-level PL statement.
Note
|
| PLSQL_OBJECT_ID | bigint(20) | NO | The ID of the PL object currently being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | bigint(20) | NO | The ID of the PL subprogram currently being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | varchar(32) | NO | The name of the PL subprogram currently being executed.
Note
|
| TX_ID | bigint(20) | NO | The ID of the current transaction.
Note
|
| BLOCKING_SESSION_ID | bigint(20) | NO | If the current session is blocked, the ID of the session that blocks the current session. This column is valid only in lock conflict scenarios and displays the ID of the session 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
Note
|
| DELTA_READ_IO_BYTES | bigint(20) | NO | The cumulative size of read files between two sampling intervals
Note
|
| DELTA_WRITE_IO_REQUESTS | bigint(20) | NO | The number of write requests between two sampling intervals
Note
|
| DELTA_WRITE_IO_BYTES | bigint(20) | NO | The cumulative size of written files between two sampling intervals
Note
|
Sample query
Query the active session history (ASH) of 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: 1148507
SAMPLE_TIME: 2025-04-28 16:51:55.539187
CON_ID: 1003
USER_ID: 200001
SESSION_ID: 2305843009213714942
SESSION_TYPE: BACKGROUND
SESSION_STATE: WAITING
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: YB42AC1E87E9-000XXXXXXXXXX-0-0
EVENT: latch: config lock wait
EVENT_NO: 132
EVENT_ID: 40
P1TEXT: address
P1: 140013133706688
P2TEXT: number
P2: 1073791887
P3TEXT: tries
P3: 0
WAIT_CLASS: CONCURRENCY
WAIT_CLASS_ID: 104
TIME_WAITED: 17903
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 51219
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: T1003_DRService
MODULE: DRService
ACTION: NULL
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 41728152
TM_DELTA_CPU_TIME: 201575
TM_DELTA_DB_TIME: 1821181
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: 2305843009213714942
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 active session history (ASH), you can generate an ASH report as needed for analysis. For more information about ASH, see ASH report.