V$SESSION

This view lists session information for each current session.

Column	Datatype	Description
`SADDR`	`RAW(4 \| 8)`	Session address
`SID`	`NUMBER`	Session identifier
`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
`PADDR`	`RAW(4 \| 8)`	Address of the process that owns the session
`USER#`	`NUMBER`	Oracle user identifier
`USERNAME`	`VARCHAR2(30)`	Oracle username
`COMMAND`	`NUMBER`	Command in progress (last statement parsed); for a list of values, see Table 7-5. These values also appear in the `AUDIT_ACTIONS` table.
`OWNERID`	`NUMBER`	The column contents are invalid if the value is `2147483644`. Otherwise, this column contains the identifier of the user who owns the migratable session. For operations using Parallel Slaves, interpret this value as a 4-byte value. The low-order 2 bytes of which represent the session number, and the high-order bytes the instance ID of the query coordinator.
`TADDR`	`VARCHAR2(8)`	Address of transaction state object
`LOCKWAIT`	`VARCHAR2(8)`	Address of lock waiting for; null if none
`STATUS`	`VARCHAR2(8)`	Status of the session: `ACTIVE` - Session currently executing SQL `INACTIVE` `KILLED` - Session marked to be killed `CACHED` - Session temporarily cached for use by Oracle*XA `SNIPED` - Session inactive, waiting on the client
`SERVER`	`VARCHAR2(9)`	Server type (`DEDICATED`\| `SHARED`\| `PSEUDO`\| `NONE`)
`SCHEMA#`	`NUMBER`	Schema user identifier
`SCHEMANAME`	`VARCHAR2(30)`	Schema user name
`OSUSER`	`VARCHAR2(30)`	Operating system client user name
`PROCESS`	`VARCHAR2(12)`	Operating system client process ID
`MACHINE`	`VARCHAR2(64)`	Operating system machine name
`TERMINAL`	`VARCHAR2(30)`	Operating system terminal name
`PROGRAM`	`VARCHAR2(48)`	Operating system program name
`TYPE`	`VARCHAR2(10)`	Session type
`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
`SQL_CHILD_NUMBER`	`NUMBER`	Child number of the SQL statement that is currently being executed
`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
`PREV_CHILD_NUMBER`	`NUMBER`	Child number of the last SQL statement executed
`MODULE`	`VARCHAR2(48)`	Name of the currently executing module as set by calling the`DBMS_APPLICATION_INFO.SET_MODULE` procedure
`MODULE_HASH`	`NUMBER`	Hash value of the above `MODULE`
`ACTION`	`VARCHAR2(32)`	Name of the currently executing action as set by calling the`DBMS_APPLICATION_INFO.SET_ACTION` procedure
`ACTION_HASH`	`NUMBER`	Hash value of the above action name
`CLIENT_INFO`	`VARCHAR2(64)`	Information set by the `DBMS_APPLICATION_INFO.SET_CLIENT_INFO` procedure
`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 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_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 of `ROW_WAIT_OBJ#` is not `-1`.
`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 column `PDML_STATUS`
`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

v$session 每一個連線到資料庫例項中的session都擁有一條記錄。包括使用者session及後臺程式如DBWR，LGWR，arcchiver等等。

v$session與其他檢視關聯的列
檢視          列                      檢視          列
v$SESSION paddr                 v$process         addr
v$SESSION taddr                 v$transaction     addr
v$SESSION sql_address         v$sql                 address
v$SESSION sql_hash_value    v$sql                 hash_value
v$SESSION sql_id                 v$sql                 address sql_id

V$SESSION

V$SESSION

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