Note
- For V4.3.x, the view was renamed to GV$OB_ACTIVE_SESSION_HISTORY since V4.3.5. For V4.2.x, the view was renamed to GV$OB_ACTIVE_SESSION_HISTORY since V4.2.2.
- This view is 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 | 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 local server. |
| SAMPLE_TIME | TIMESTAMP(6) | NO | The sampling time. |
| CON_ID | NUMBER | NO | The tenant ID. |
| USER_ID | NUMBER | NO | The user ID of the sampled session. |
| SESSION_ID | bigint(20) | NO | ID of the sampled session. For V4.3.x:
|
| SESSION_TYPE | VARCHAR2(10) | NO | Session type. |
| SESSION_STATE | VARCHAR2(7) | NO | Session status. EVENT field. |
| SQL_ID | VARCHAR2(32) | NO | The ID of the SQL statement. |
| PLAN_ID | NUMBER | NO | The plan ID of the SQL statement in the plan cache. This field associates sampling points with plans. |
| 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 number of the waiting event, which is used for queries across tables. |
| EVENT_ID | NUMBER | NO | The ID of the current waiting event.
Note
|
| P1TEXT | VARCHAR2(64) | NO | The name of parameter 1 of the waiting event. The name varies with the value of the EVENT field. |
| P1 | NUMBER | NO | The value of parameter 1. |
| P2TEXT | VARCHAR2(64) | NO | The name of parameter 2 of the waiting event. The name varies with the value of the EVENT field. |
| P2 | NUMBER | NO | The value of parameter 2. |
| P3TEXT | VARCHAR2(64) | NO | The name of parameter 3 of the waiting event. The name varies with the value of the EVENT field. |
| P3 | NUMBER | NO | The value of parameter 3. |
| 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, which is used for queries across tables. |
| TIME_WAITED | NUMBER | NO | The total waiting time of the waiting event, in microseconds (us). |
| SQL_PLAN_LINE_ID | NUMBER | NO | The number of the SQL operator in the SQL plan when the sampling is performed. |
| GROUP_ID | NUMBER | NO | The ID of the resource group to which the sample belongs. |
| PLAN_HASH | NUMBER | NO | The plan hash value of the current SQL statement. |
| THREAD_ID | NUMBER | NO | The ID of the thread in which the active session is located. |
| STMT_TYPE | NUMBER | NO | The SQL type of the active session. |
| TIME_MODEL | NUMBER | NO | The time model information, which is a collection of IN_XXX field values (such as IN_PARSE and IN_PL_PARSE). |
| IN_PARSE | VARCHAR2(1) | NO | Whether the session is performing SQL parse when the sampling is performed. |
| IN_PL_PARSE | VARCHAR2(1) | NO | Whether the session is performing PL/SQL parse when the sampling is performed. |
| IN_PLAN_CACHE | VARCHAR2(1) | NO | Whether the session is performing plan cache matching when the sampling is performed. |
| IN_SQL_OPTIMIZE | VARCHAR2(1) | NO | Whether the session is performing SQL parsing optimization when the sampling is performed. |
| IN_SQL_EXECUTION | VARCHAR2(1) | NO | Whether the session is performing SQL execution when the sampling is performed. |
| IN_PX_EXECUTION | VARCHAR2(1) | NO | Whether the session is performing parallel SQL execution when the sampling is performed. When the session is in this state, it is also in the IN_SQL_EXECUTION state. |
| IN_SEQUENCE_LOAD | VARCHAR2(1) | NO | Whether the session is obtaining values from auto-increment columns or sequences when the sampling is performed. |
| IN_COMMITTING | VARCHAR2(1) | NO | Whether the current sampling point is in the transaction commit phase.
NoteThis field is introduced in V4.2.1. |
| IN_STORAGE_READ | VARCHAR2(1) | NO | Whether the current sampling point is in the storage read phase.
NoteThis field is introduced in V4.2.1. |
| IN_STORAGE_WRITE | VARCHAR2(1) | NO | Whether the current sampling point is in the storage write phase.
NoteThis field is introduced in V4.2.1. |
| IN_REMOTE_DAS_EXECUTION | VARCHAR2(1) | NO | Whether the current sampling point is in the DAS remote execution phase.
NoteThis field is introduced in V4.2.1. |
| MODULE | VARCHAR2(64) | NO | The MODULE value recorded when the sampling is performed. This value is set by using the DBMS_APPLICATION_INFO.SET_MODULE package. |
| ACTION | VARCHAR2(64) | NO | The ACTION value recorded when the sampling is performed. This value is set by using the DBMS_APPLICATION_INFO.SET_ACTION package. |
| CLIENT_ID | VARCHAR2(64) | NO | The CLIENT_ID value recorded when the sampling is performed. This value is set by using the DBMS_SESSION.set_identifier package. |
| BACKTRACE | VARCHAR2(512) | NO | The auxiliary debugging field that records the code call stack when the event occurs. The value of this field is always NULL. |
| TM_DELTA_TIME | NUMBER | NO | The time interval for calculating the time model, in microseconds.
Note
|
| TM_DELTA_CPU_TIME | NUMBER | NO | The amount of time spent in CPU in the past TM_DELTA_TIME period.
Note
|
| TM_DELTA_DB_TIME | NUMBER | NO | The amount of time spent in database calls in the past TM_DELTA_TIME period.
Note
|
| TOP_LEVEL_SQL_ID | CHAR(32) | NO | The ID of the top-level SQL statement.
Note
|
| IN_PLSQL_COMPILATION | VARCHAR2(1) | NO | The current PL compilation status: Y/N.
Note
|
| IN_PLSQL_EXECUTION | VARCHAR2(1) | NO | The current PL execution status: Y/N.
Note
|
| PLSQL_ENTRY_OBJECT_ID | NUMBER | NO | The OBJECT ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_ID | NUMBER | NO | The subprogram ID of the top-level PL statement.
Note
|
| PLSQL_ENTRY_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The subprogram name of the top-level PL statement.
Note
|
| PLSQL_OBJECT_ID | NUMBER | NO | The ID of the PL object being executed.
Note
|
| PLSQL_SUBPROGRAM_ID | NUMBER | NO | The ID of the PL subprogram being executed.
Note
|
| PLSQL_SUBPROGRAM_NAME | VARCHAR2(32) | NO | The name of the PL subprogram being executed.
Note
|
| TX_ID | NUMBER | NO | The current transaction ID.
Note
|
| BLOCKING_SESSION_ID | NUMBER | NO | The ID of the session that blocks the current session. This field takes effect only in lock conflict scenarios and displays the ID of the session that holds the lock.
Note
|
| TABLET_ID | NUMBER | NO | The ID of the tablet on which the current SQL statement is being processed.
Note
|
| PROXY_SID | NUMBER | NO | The proxy session ID.
Note
|
| DELTA_READ_IO_REQUESTS | NUMBER(38) | NO | The number of read I/O operations between two sampling points.
Note
|
| DELTA_READ_IO_BYTES | NUMBER(38) | NO | The total size of files read between two sampling points.
Note
|
| DELTA_WRITE_IO_REQUESTS | NUMBER(38) | NO | The number of write I/O operations between two sampling points.
Note
|
| DELTA_WRITE_IO_BYTES | NUMBER(38) | NO | The total size of files written between two sampling points.
Note
|
Sample query
View the active session history of all OBServer nodes in the current tenant.
obclient [SYS]> SELECT * FROM SYS.GV$OB_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: 1163912
SAMPLE_TIME: 28-APR-25 05.23.05.458664 PM
CON_ID: 1004
USER_ID: 200001
SESSION_ID: 2305843009213714851
SESSION_TYPE: BACKGROUND
SESSION_STATE: WAITING
SQL_ID: NULL
PLAN_ID: 0
TRACE_ID: NULL
EVENT: exec inner sql wait
EVENT_NO: 100
EVENT_ID: 30000
P1TEXT: wait inner sql class
P1: 30001
P2TEXT: inner session id
P2: 4611686018518671575
P3TEXT: NULL
P3: 0
WAIT_CLASS: OTHER
WAIT_CLASS_ID: 100
TIME_WAITED: 19578
SQL_PLAN_LINE_ID: NULL
GROUP_ID: 0
PLAN_HASH: NULL
THREAD_ID: 51154
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_TenantWeakReadService
MODULE: TenantWeakReadService
ACTION: gen_cluster_version
CLIENT_ID: NULL
BACKTRACE: NULL
TM_DELTA_TIME: 5086155
TM_DELTA_CPU_TIME: 45447
TM_DELTA_DB_TIME: 915630
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: 4611686018518671575
TABLET_ID: NULL
PROXY_SID: 2305843009213714851
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, you can generate an ASH report for analysis as needed. For more information about ASH, see ASH report.