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 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 on the server. |
| SAMPLE_TIME | timestamp(6) | NO | The time when the sample was collected. |
| 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.
|
| 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 waiting 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 with 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 with 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 with 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 waiting 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 ID 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 statement that is currently being executed. |
| THREAD_ID | bigint(20) | NO | The ID of the thread to which the current 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 time. |
| IN_PL_PARSE | varchar(1) | NO | Indicates whether the session is performing SQL PL parsing at the sampling time. |
| IN_PLAN_CACHE | varchar(1) | NO | Indicates whether the session is performing plan cache matching at the sampling time. |
| IN_SQL_OPTIMIZE | varchar(1) | NO | Indicates whether the session is performing SQL parsing optimization at the sampling time. |
| IN_SQL_EXECUTION | varchar(1) | NO | Indicates whether the session is performing SQL execution at the sampling time. |
| IN_PX_EXECUTION | varchar(1) | NO | Indicates whether the session is performing parallel SQL 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 | varchar(1) | NO | Indicates whether the session is retrieving values for an auto-increment column or sequence at the sampling time. |
| 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 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 sampling point:
|
| MODULE | varchar(64) | NO | The MODULE value recorded by the session at the sampling time, which is set by the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | varchar(64) | NO | The ACTION value recorded by the session at the sampling time, which is set by the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | varchar(64) | NO | The CLIENT_ID value recorded by the session at the sampling time, which is set by the DBMS_SESSION.set_identifier package. |
| BACKTRACE | varchar(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 | 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 current PL compilation status: Y/N.
Note
|
| IN_PLSQL_EXECUTION | varchar(1) | NO | The current PL execution status: Y/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 currently being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | bigint(20) | NO | The subprogram ID of the PL statement currently being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | varchar(32) | NO | The subprogram name of the PL statement 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, this column displays the ID of the session that is blocking the current session. Currently, this column is effective only in lock conflict scenarios, where it displays the ID of the session that holds the lock.
Note
|
| TABLET_ID | bigint(20) | NO | The ID of the tablet that is processing 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
|
| WEIGHT | bigint(20) | NO | The number of times the same tenant and action occur during the time period corresponding to the WR record.
NoteFor V4.4.x, this column is available starting with V4.4.2. |
| IS_WR_WEIGHT_SAMPLE | varchar(1) | NO | Indicates whether this column is an aggregated column for queue backlog waiting events.
NoteFor V4.4.x, this column is available starting with V4.4.2. |
Sample query
Query the active session history (ASH) records of the current OBServer node in the current tenant.
obclient(root@mysql001)[(none)]> 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: 862080
SAMPLE_TIME: 2026-01-09 11:31:01.099424
CON_ID: 1002
USER_ID: 0
SESSION_ID: 2305843009213712866
SESSION_TYPE: BACKGROUND
SESSION_STATE: WAITING
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: NULL
EVENT: default condition wait
EVENT_NO: 41
EVENT_ID: 15101
P1TEXT: address
P1: 140698283929200
P2TEXT:
P2: 0
P3TEXT:
P3: 0
WAIT_CLASS: CONCURRENCY
WAIT_CLASS_ID: 104
TIME_WAITED: 99787
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 95655
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: 1000642
TM_DELTA_CPU_TIME: 377
TM_DELTA_DB_TIME: 1000642
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: 2305843009213712866
DELTA_READ_IO_REQUESTS: 0
DELTA_READ_IO_BYTES: 0
DELTA_WRITE_IO_REQUESTS: 0
DELTA_WRITE_IO_BYTES: 0
WEIGHT: 1
IS_WR_WEIGHT_SAMPLE: N
1 row in set (0.017 sec)
References
After you obtain the ASH records, you can generate ASH reports as needed for analysis. For more information about ASH, see ASH reports.