about V$session,v$lock

V$LOCK
This view lists the locks currently held by the Oracle server and outstanding requests for a lock or latch. Column  Datatype  Description
ADDR
RAW(4)
Address of lock state object

KADDR
RAW(4)
Address of lock

SID
NUMBER
Identifier for session holding or acquiring the lock

TYPE
VARCHAR2(2)
Type of user or system lock. The locks on the user types are obtained by user applications. Any process that is blocking others is likely to be holding one of these locks. The user type locks are: TM: DML enqueue TX: Transaction enqueue UL: User supplied The locks on the system types are held for extremely short periods of time. The system type locks are listed in Table 3-1.

ID1
NUMBER
Lock identifier #1 (depends on type)

ID2
NUMBER
Lock identifier #2 (depends on type)

LMODE
NUMBER
Lock mode in which the session holds the lock: 0, None 1, Null (NULL) 2, Row-S (SS) 3, Row-X (SX) 4, Share (S) 5, S/Row-X (SSX) 6, Exclusive (X)
REQUEST
NUMBER
Lock mode in which the process requests the lock: 0, None 1, Null (NULL) 2, Row-S (SS) 3, Row-X (SX) 4, Share (S) 5, S/Row-X (SSX) 6, Exclusive (X)
CTIME
NUMBER
Time since current mode was granted

BLOCK
NUMBER
The lock is blocking another lock
V$SESSION
This view lists session information for each current session. Column  Datatype  Description
SADDR
RAW(4)
Session address

SID
NUMBER
Session identifier

SERIAL#
NUMBER
Session serial number. Used to identify uniquely 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)
Address of the process that owns this 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 3-3. These values also appear in the data dictionary view AUDIT_ACTIONS.

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 4Byte value. The low-order 2Bytes 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 (currently executing SQL), INACTIVE, KILLED (ed to be killed), CACHED (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(15)
Operating system client user name

PROCESS
VARCHAR2(9)
Operating system client process ID

MACHINE
VARCHAR2(64)
Operating system machine name

TERMINAL
VARCHAR2(10)
Operating system terminal name

PROGRAM
VARCHAR2(48)
Operating system program name

TYPE
VARCHAR2(10)
Session type

PREV_SQL_ADDR
RAW(4)
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.

SQL_ADDRESS
RAW(4)
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

MODULE
VARCHAR2(48)
Contains the name of the currently executing module as set by calling the DBMS_APPLICATION_INFO.SET_MODULE procedure

MODULE_HASH
NUMBER
The hash value of the above MODULE

ACTION
VARCHAR2(32)
Contains the name of the currently executing action as set by calling the DBMS_APPLICATION_INFO.SET_ACTION procedure

ACTION_HASH
NUMBER
The 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 ROWID specified in ROW_WAIT_ROW#

ROW_WAIT_FILE#
NUMBER
Identifier for the datafile containing the ROWID 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 ROWID 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
The current ROWID 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
The last call

PDML_ENABLED
VARCHAR2(3)
This column has been replaced by PDML_STATUS. See below.

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: the client is able to fail over its session following a disconnect SELECT: the client is able to fail over queries in progress as well See Also: Oracle8i Concepts for more information on TAF Net8 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: the client itself reconnects following a disconnect PRECONNECT: the backup instance can support all connections from every instance for which it is backup
FAILED_OVER
VARCHAR2(3)
Indicates (YES or NO) whether the session is running in failover mode and failover has occurred

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
VARCHAR(8)
If ENABLED, the session is in a PARALLEL QUERY enabled mode. If DISABLED, PARALLEL QUERY enabled mode is not supported for the session. If FORCED, the session has been altered to force PARALLEL QUERY.
v$lock:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch396.htm#1116909
v$session:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch3171.htm#1122127

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about V$session,v$lock

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