如何进行session和v$session说明

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.                        

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:                        

SELECT command_name                        

   FROM v$sqlcommand                        

   WHERE command_type = n;                        

A value of 0 in this COMMAND column means the command is not recorded in V$SESSION.                        

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.                        

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                            

ACTIVE - Session currently executing SQL                        

INACTIVE - Session which is inactive and either has no configured limits or has not yet exceeded the configured limits                        

KILLED - Session marked to be killed                        

CACHED - Session temporarily cached for use by Oracle*XA                        

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.                        

SERVER                        

VARCHAR2(9)                        

Server type:                        

服务类型（一般专用类型）                            

DEDICATED                        

SHARED                        

PSEUDO                        

POOLED                        

NONE                        

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.                        

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:                        

NONE - Failover is disabled for this session                        

SESSION - Client is able to fail over its session following a disconnect                        

SELECT - Client is able to fail over queries in progress as well                        

See Also:                        

Oracle Database Concepts for more information on TAF                        

Oracle Database Net Services Administrator's Guide for information on configuring TAF                        

FAILOVER_METHOD                        

VARCHAR2(10)                        

Indicates the transparent application failover method for the session:                        

NONE - Failover is disabled for this session                        

BASIC - Client itself reconnects following a disconnect                        

PRECONNECT - Backup instance can support all connections from every instance for which it is backed up                        

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:                        

VALID - there is a blocking session, and it is identified in theBLOCKING_INSTANCE and BLOCKING_SESSION columns                        

NO HOLDER - there is no session blocking this session                        

NOT IN WAIT - this session is not in a wait                        

UNKNOWN - the blocking session is unknown                        

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:                        

VALID - there is a final blocking session and it is identified in theFINAL_BLOCKING_INSTANCE and FINAL_BLOCKING_SESSION columns                        

NO HOLDER - there is no session blocking this session                        

NOT IN WAIT - this session is not in a wait                        

UNKNOWN - the final blocking session is unknown                        

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"                        

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)                        

P1RAW                        

RAW(8)                        

First wait event parameter (in hexadecimal)Foot 2                         

P2TEXT                        

VARCHAR2(64)                        

Description of the second wait event parameter                        

P2                        

NUMBER                        

Second wait event parameter (in decimal)                        

P2RAW                        

RAW(8)                        

Second wait event parameter (in hexadecimal)Footref 2                        

P3TEXT                        

VARCHAR2(64)                        

Description of the third wait event parameter                        

P3                        

NUMBER                        

Third wait event parameter (in decimal)                        

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:                        

> 0 - Value is the duration of the last wait in hundredths of a second                        

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