Friday, 25 May 2012

Database session using V$SESSION in Oracle

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
See Also:
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. If DISABLED, PARALLEL QUERY enabled mode is not supported for the session. If FORCED, the session has been altered to force PARALLEL QUERY.
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) Blocking session status:
  • VALID
  • NO HOLDER
  • GLOBAL
  • NOT IN WAIT
  • UNKNOWN
BLOCKING_INSTANCE NUMBER Instance identifier of blocking session
BLOCKING_SESSION NUMBER Session identifier of blocking session
SEQ# NUMBER Sequence number that uniquely identifies the wait. Incremented for each wait.
EVENT# NUMBER Event number
EVENT VARCHAR2(64) Resource or event for which the session is waiting See Also: Appendix C, "Oracle Wait Events"
P1TEXT VARCHAR2(64) Description of the first additional parameter
P1 NUMBER First additional parameter
P1RAW RAW(4) First additional parameter
P2TEXT VARCHAR2(64) Description of the second additional parameter
P2 NUMBER Second additional parameter
P2RAW RAW(4) Second additional parameter
P3TEXT VARCHAR2(64) Description of the third additional parameter
P3 NUMBER Third additional parameter
P3RAW RAW(4) Third additional parameter
WAIT_CLASS_ID NUMBER Identifier of the wait class
WAIT_CLASS# NUMBER Number of the wait class
WAIT_CLASS VARCHAR2(64) Name of the wait class
WAIT_TIME NUMBER A nonzero value is the session's last wait time. A zero value means the session is currently waiting.
SECONDS_IN_WAIT NUMBER If WAIT_TIME = 0, then SECONDS_IN_WAIT is the seconds spent in the current wait condition. If WAIT_TIME > 0, then SECONDS_IN_WAIT is the seconds since the start of the last wait, and SECONDS_IN_WAIT - WAIT_TIME / 100 is the active seconds since the last wait ended.
STATE VARCHAR2(19) Wait state:
  • 0 - WAITING (the session is currently waiting)
  • -2 - WAITED UNKNOWN TIME (duration of last wait is unknown)
  • -1 - WAITED SHORT TIME (last wait <1/100th of a second)
  • >0 - WAITED KNOWN TIME (WAIT_TIME = duration of last wait)
SERVICE_NAME VARCHAR2(64) Service name of the session
SQL_TRACE VARCHAR2(8) Indicates whether SQL tracing is enabled (ENABLED) or disabled (DISABLED)
SQL_TRACE_WAITS VARCHAR2(5) Indicates whether wait tracing is enabled (TRUE) or not (FALSE)
SQL_TRACE_BINDS VARCHAR2(5) Indicates whether bind tracing is enabled (TRUE) or not (FALSE)

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