Note
- For V4.3.x, this view was renamed to GV$OB_ACTIVE_SESSION_HISTORY starting from V4.3.5. For V4.2.x, this view was renamed to GV$OB_ACTIVE_SESSION_HISTORY starting from V4.2.2.
- This view was introduced in V4.0.0.
Purpose
The GV$ACTIVE_SESSION_HISTORY view displays the active session history of all OBServer nodes in the current tenant.
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 time when the sample was taken. |
| CON_ID | bigint(20) | NO | The tenant ID. |
| USER_ID | bigint(20) | NO | The user ID of the session that was sampled. |
| SESSION_ID | bigint(20) | NO | The ID of the session that was sampled. For V4.3.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 plan ID of the sampled SQL statement 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 waiting event.
Note
|
| P1TEXT | varchar(64) | NO | The name of the first parameter of the waiting event. This 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. This 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. This 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 of the session at the time the sample was taken. |
| 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 statement that is currently being executed. |
| THREAD_ID | bigint(20) | NO | The ID of the thread in which the active session is located. |
| STMT_TYPE | bigint(20) | NO | The SQL type of the current active session. |
| TIME_MODEL | bigint(20) | 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 | varchar(1) | NO | Indicates whether the session is performing SQL parsing during sampling. |
| IN_PL_PARSE | varchar(1) | NO | Indicates whether the session is performing SQL PL parsing during sampling. |
| IN_PLAN_CACHE | varchar(1) | NO | Indicates whether the session is performing plan cache matching during sampling. |
| IN_SQL_OPTIMIZE | varchar(1) | NO | Indicates whether the session is performing SQL parsing optimization during sampling. |
| IN_SQL_EXECUTION | varchar(1) | NO | Indicates whether the session is performing SQL execution during sampling. |
| IN_PX_EXECUTION | varchar(1) | NO | Indicates whether the session is performing SQL parallel execution during sampling. When 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 performing value retrieval for an auto-increment column or a SEQUENCE during sampling. |
| IN_COMMITTING | varchar(1) | NO | Indicates whether the current 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 current 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 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 push-down execution phase. |
| IN_RPC_ENCODE | varchar(1) | NO | The serialization operation being performed by the current SQL statement. |
| IN_RPC_DECODE | varchar(1) | NO | The deserialization operation being performed by the current SQL statement. |
| IN_CONNECTION_MGR | varchar(1) | NO | The connection establishment operation being performed by the current SQL statement. |
| PROGRAM | varchar(64) | NO | The name of the program being executed at the current sampling point:
|
| MODULE | varchar(64) | NO | The MODULE value recorded by the session during sampling. This value is set by using the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | varchar(64) | NO | The ACTION value recorded by the session during sampling. This value is set by using the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | varchar(64) | NO | The CLIENT_ID value recorded by the session during sampling. This value is set by using the DBMS_SESSION.set_identifier package. |
| BACKTRACE | varchar(512) | NO | A debugging field that records the code call stack at the time of the event. The value of this field is always NULL. |
| TM_DELTA_TIME | bigint(20) | NO | The time interval for calculating 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 period.
Note
|
| TM_DELTA_DB_TIME | bigint(20) | NO | The amount of time spent on database calls in 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 | 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 object ID of the PL statement being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | bigint(20) | NO | The subprogram ID of the PL statement being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | varchar(32) | NO | The subprogram name of the PL statement 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 is blocking it. This column is effective only in lock conflict scenarios, displaying the ID of the session holding the lock.
Note
|
| TABLET_ID | bigint(20) | NO | The ID of the tablet being processed by the current SQL statement.
Note
|
| PROXY_SID | bigint(20) | NO | The ID of the proxy session.
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 total size of files read 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 total size of files written between two sampling intervals.
Note
|
Sample query
Query the active session history (ASH) records of all observer nodes in the current tenant.
obclient [oceanbase]> SELECT * FROM oceanbase.GV$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: 1163161
SAMPLE_TIME: 2025-04-28 17:21:27.585628
CON_ID: 1002
USER_ID: 0
SESSION_ID: 2305843009213709012
SESSION_TYPE: BACKGROUND
SESSION_STATE: WAITING
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: NULL
EVENT: latch: config lock wait
EVENT_NO: 132
EVENT_ID: 40
P1TEXT: address
P1: 140013133706752
P2TEXT: number
P2: 1073791886
P3TEXT: tries
P3: 0
WAIT_CLASS: CONCURRENCY
WAIT_CLASS_ID: 104
TIME_WAITED: 10547
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 50828
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_ServerProbeSrv
MODULE: ServerProbeSrv
ACTION: NULL
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 2033101
TM_DELTA_CPU_TIME: 4670
TM_DELTA_DB_TIME: 1070464
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: 2305843009213709012
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 ASH records, you can generate ASH reports as needed for analysis. For more information about ASH reports, see ASH reports.