Column | Datatype | Description | 说明 | SADDR | RAW(4 | 8) | Session address | |
SID | NUMBER | Session identifier | 通过这两个值来确定唯一的一个session |
SERIAL# | NUMBER | Session serial number. Used to uniquely identify a session's objects. Guarantees that session-level commands are applied to the correct session objects if the session ends and another session begins with the same session ID. |
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AUDSID | NUMBER | Auditing session ID | If AUDSID=0, then it is an internally generated SYS session.
If AUDSID=UB4MAX(4294967295), then it is a direct SYS session. |
PADDR | RAW(4 | 8) | Address of the process that owns the session | process address,关联v$process的addr字段 |
USER# | NUMBER | Oracle user identifier | 同dba_users关联 |
USERNAME | VARCHAR2(30) | Oracle username | 同dba_users |
COMMAND | NUMBER | Command in progress (last statement parsed). | session正在执行的sql id，1代表create table,3代表select |
You can find the command name for any value n returned in thisCOMMAND column by running this SQL query: |
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SELECT command_name |
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FROM v$sqlcommand |
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WHERE command_type = n; |
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A value of 0 in this COMMAND column means the command is not recorded in V$SESSION. |
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OWNERID | NUMBER | Identifier of the user who owns the migratable session; the column contents are invalid if the value is 2147483644 | |
For operations using Parallel Slaves, interpret this value as a 4-byte value. The low-order 2 bytes represent the session number and the high-order bytes represent the instance ID of the query coordinator. | |
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TADDR | VARCHAR2(8) | Address of the transaction state object | 当前的transaction address。可以用来关联v$transaction中的addr字段 |
LOCKWAIT | VARCHAR2(8) | Address of the lock the session is waiting for; NULL if none | 可以通过这个字段查询出当前正在等待的锁的相关信息。sid + lockwait与v$loc中的sid + kaddr相对应。 |
STATUS | VARCHAR2(8) | Status of the session: | 用来判断session状态。Active:正执行SQL语句。inactive:等待操作。killed:被标注为杀死 |
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ACTIVE - Session currently executing SQL |
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INACTIVE - Session which is inactive and either has no configured limits or has not yet exceeded the configured limits |
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KILLED - Session marked to be killed |
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CACHED - Session temporarily cached for use by Oracle*XA |
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SNIPED - An inactive session that has exceeded some configured limits (for example, resource limits specified for the resource manager consumer group or idle_time specified in the user's profile). Such sessions will not be allowed to become active again. |
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SERVER | VARCHAR2(9) | Server type: | 服务类型（一般专用类型） |
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DEDICATED |
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SHARED |
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PSEUDO |
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POOLED |
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NONE |
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SCHEMA# | NUMBER | Schema user identifier | 跟USER#一致 |
SCHEMANAME | VARCHAR2(30) | Schema user name | 跟USERNAME一致 |
OSUSER | VARCHAR2(30) | Operating system client user name | 客户端操作系统用户名 |
PROCESS | VARCHAR2(24) | Operating system client process ID | 客户端process id |
MACHINE | VARCHAR2(64) | Operating system machine name | 客户端machine name |
PORT | NUMBER | Client port number | 客户端的端口号 |
TERMINAL | VARCHAR2(30) | Operating system terminal name | 客户端执行的terminal name |
PROGRAM | VARCHAR2(48) | Operating system program name | 客户端应用程序 |
TYPE | VARCHAR2(10) | Session type | 用户进程还是后台进程，后台进程一般不能KILL |
SQL_ADDRESS | RAW(4 | 8) | Used with SQL_HASH_VALUE to identify the SQL statement that is currently being executed | |
SQL_HASH_VALUE | NUMBER | Used with SQL_ADDRESS to identify the SQL statement that is currently being executed | |
SQL_ID | VARCHAR2(13) | SQL identifier of the SQL statement that is currently being executed | 当前被执行的SQL语句，跟v$sql关联 |
SQL_CHILD_NUMBER | NUMBER | Child number of the SQL statement that is currently being executed | |
SQL_EXEC_START | DATE | Time when the execution of the SQL currently executed by this session started; NULL if SQL_ID is NULL | 当前sql的开始运行时间 |
SQL_EXEC_ID | NUMBER | SQL execution identifier; NULL if SQL_ID is NULL or if the execution of that SQL has not yet started (see V$SQL_MONITOR) | |
PREV_SQL_ADDR | RAW(4 | 8) | Used with PREV_HASH_VALUE to identify the last SQL statement executed | |
PREV_HASH_VALUE | NUMBER | Used with SQL_HASH_VALUE to identify the last SQL statement executed | |
PREV_SQL_ID | VARCHAR2(13) | SQL identifier of the last SQL statement executed | 刚被执行的SQL语句，从v$sql查询相应的SQL语句 |
PREV_CHILD_NUMBER | NUMBER | Child number of the last SQL statement executed | |
PREV_EXEC_START | DATE | SQL execution start of the last executed SQL statement | |
PREV_EXEC_ID | NUMBER | SQL execution identifier of the last executed SQL statement | |
PLSQL_ENTRY_OBJECT_ID | NUMBER | Object ID of the top-most PL/SQL subprogram on the stack; NULL if there is no PL/SQL subprogram on the stack | |
PLSQL_ENTRY_SUBPROGRAM_ID | NUMBER | Subprogram ID of the top-most PL/SQL subprogram on the stack; NULL if there is no PL/SQL subprogram on the stack | |
PLSQL_OBJECT_ID | NUMBER | Object ID of the currently executing PL/SQL subprogram; NULL if executing SQL | |
PLSQL_SUBPROGRAM_ID | NUMBER | Subprogram ID of the currently executing PL/SQL object; NULL if executing SQL | |
MODULE | VARCHAR2(48) | Name of the currently executing module as set by calling theDBMS_APPLICATION_INFO.SET_MODULE procedure | |
MODULE_HASH | NUMBER | Hash value of the MODULE column | |
ACTIONFootref 1 | VARCHAR2(32) | Name of the currently executing action as set by calling theDBMS_APPLICATION_INFO.SET_ACTION procedure | |
ACTION_HASH | NUMBER | Hash value of the ACTION column | |
CLIENT_INFO | VARCHAR2(64) | Information set by the DBMS_APPLICATION_INFO.SET_CLIENT_INFOprocedure | |
FIXED_TABLE_SEQUENCE | NUMBER | This contains a number that increases every time the session completes a call to the database and there has been an intervening select from a dynamic performance table. This column can be used by performance monitors to monitor statistics in the database. Each time the performance monitor looks at the database, it only needs to look at sessions that are currently active or have a higher value in this column than the highest value that the performance monitor saw the last time. All the other sessions have been idle since the last time the performance monitor looked at the database. | |
ROW_WAIT_OBJ# | NUMBER | Object ID for the table containing the row specified in ROW_WAIT_ROW# | |
ROW_WAIT_FILE# | NUMBER | Identifier for the datafile containing the row specified inROW_WAIT_ROW#. This column is valid only if the session is currently waiting for another transaction to commit and the value ofROW_WAIT_OBJ# is not -1. | |
ROW_WAIT_BLOCK# | NUMBER | Identifier for the block containing the row specified in ROW_WAIT_ROW#. This column is valid only if the session is currently waiting for another transaction to commit and the value of ROW_WAIT_OBJ# is not -1. | |
ROW_WAIT_ROW# | NUMBER | Current row being locked. This column is valid only if the session is currently waiting for another transaction to commit and the value ofROW_WAIT_OBJ# is not -1. | |
TOP_LEVEL_CALL# | NUMBER | Oracle top level call number | |
LOGON_TIME | DATE | Time of logon | |
LAST_CALL_ET | NUMBER | If the session STATUS is currently ACTIVE, then the value represents the elapsed time (in seconds) since the session has become active. | |
If the session STATUS is currently INACTIVE, then the value represents the elapsed time (in seconds) since the session has become inactive. | |
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PDML_ENABLED | VARCHAR2(3) | This column has been replaced by the PDML_STATUS column | |
FAILOVER_TYPE | VARCHAR2(13) | Indicates whether and to what extent transparent application failover (TAF) is enabled for the session: | |
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NONE - Failover is disabled for this session | |
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SESSION - Client is able to fail over its session following a disconnect | |
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SELECT - Client is able to fail over queries in progress as well | |
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See Also: | |
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Oracle Database Concepts for more information on TAF | |
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Oracle Database Net Services Administrator's Guide for information on configuring TAF | |
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FAILOVER_METHOD | VARCHAR2(10) | Indicates the transparent application failover method for the session: | |
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NONE - Failover is disabled for this session | |
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BASIC - Client itself reconnects following a disconnect | |
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PRECONNECT - Backup instance can support all connections from every instance for which it is backed up | |
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FAILED_OVER | VARCHAR2(3) | Indicates whether the session is running in failover mode and failover has occurred (YES) or not (NO) | |
RESOURCE_CONSUMER_GROUP | VARCHAR2(32) | Name of the session's current resource consumer group | |
PDML_STATUS | VARCHAR2(8) | If ENABLED, the session is in a PARALLEL DML enabled mode. If DISABLED,PARALLEL DML enabled mode is not supported for the session. If FORCED, the session has been altered to force PARALLEL DML. | |
PDDL_STATUS | VARCHAR2(8) | If ENABLED, the session is in a PARALLEL DDL enabled mode. If DISABLED,PARALLEL DDL enabled mode is not supported for the session. If FORCED, the session has been altered to force PARALLEL DDL. | |
PQ_STATUS | VARCHAR2(8) | If ENABLED, the session is in a PARALLEL QUERY enabled mode. IfDISABLED, PARALLEL QUERY enabled mode is not supported for the session. If FORCED, the session has been altered to force PARALLELQUERY. | |
CURRENT_QUEUE_DURATION | NUMBER | If queued (1), the current amount of time the session has been queued. If not currently queued, the value is 0. | |
CLIENT_IDENTIFIER | VARCHAR2(64) | Client identifier of the session | |
BLOCKING_SESSION_STATUS | VARCHAR2(11) | This column provides details on whether there is a blocking session: | |
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VALID - there is a blocking session, and it is identified in theBLOCKING_INSTANCE and BLOCKING_SESSION columns | |
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NO HOLDER - there is no session blocking this session | |
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NOT IN WAIT - this session is not in a wait | |
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UNKNOWN - the blocking session is unknown | |
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BLOCKING_INSTANCE | NUMBER | Instance identifier of the blocking session. This column is valid only ifBLOCKING_SESSION_STATUS has the value VALID. | |
BLOCKING_SESSION | NUMBER | Session identifier of the blocking session. This column is valid only ifBLOCKING_SESSION_STATUS has the value VALID. | |
FINAL_BLOCKING_SESSION_STATUS | VARCHAR2(11) | The final blocking session is the final element in the wait chain constructed by following the sessions that are blocked by one another starting with this session. In the case of a cyclical wait chain, one of the sessions in the wait chain will be chosen as the final blocker. | |
This column provides details on whether there is a final blocking session: | |
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VALID - there is a final blocking session and it is identified in theFINAL_BLOCKING_INSTANCE and FINAL_BLOCKING_SESSION columns | |
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NO HOLDER - there is no session blocking this session | |
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NOT IN WAIT - this session is not in a wait | |
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UNKNOWN - the final blocking session is unknown | |
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FINAL_BLOCKING_INSTANCE | NUMBER | Instance identifier of the final blocking session. This column is valid only ifFINAL_BLOCKING_SESSION_STATUS has the value VALID. | |
FINAL_BLOCKING_SESSION | NUMBER | Session identifier of the blocking session. This column is valid only ifFINAL_BLOCKING_SESSION_STATUS has the value VALID. | |
SEQ# | NUMBER | A number that uniquely identifies the current or last wait (incremented for each wait) | |
EVENT# | NUMBER | Event number | 等待事件的编号跟v$session_wait关联 |
EVENT | VARCHAR2(64) | Resource or event for which the session is waiting | 等待事件的解释跟v$session_wait关联 |
See Also: Appendix C, "Oracle Wait Events" |
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P1TEXT | VARCHAR2(64) | Description of the first wait event parameter | 对应DBA_EXTENTS的FILE_ID,BLOCK_ID,BLOCKS |
P1 | NUMBER | First wait event parameter (in decimal) |
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P1RAW | RAW(8) | First wait event parameter (in hexadecimal)Foot 2 |
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P2TEXT | VARCHAR2(64) | Description of the second wait event parameter |
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P2 | NUMBER | Second wait event parameter (in decimal) |
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P2RAW | RAW(8) | Second wait event parameter (in hexadecimal)Footref 2 |
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P3TEXT | VARCHAR2(64) | Description of the third wait event parameter |
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P3 | NUMBER | Third wait event parameter (in decimal) |
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P3RAW | RAW(8) | Third wait event parameter (in hexadecimal)Footref 2 | |
WAIT_CLASS_ID | NUMBER | Identifier of the class of the wait event | |
WAIT_CLASS# | NUMBER | Number of the class of the wait event | |
WAIT_CLASS | VARCHAR2(64) | Name of the class of the wait event | |
WAIT_TIME | NUMBER | If the session is currently waiting, then the value is 0. If the session is not in a wait, then the value is as follows: | |
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> 0 - Value is the duration of the last wait in hundredths of a second |
文章标题：如何进行session和v$session说明
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