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Oracle® Database Reference
10g Release 1 (10.1)

Part Number B10755-01
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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 5-5. 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 Last call
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(13) Blocking session status:
  • VALID

  • NO HOLDER

  • GLOBAL

  • UNIMPLEMENTED

  • UNKNOWN

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

Table 5-5 COMMAND Column of V$SESSION and Corresponding Commands

Number Command Number Command
1 CREATE TABLE 2 INSERT
3 SELECT 4 CREATE CLUSTER
5 ALTER CLUSTER 6 UPDATE
7 DELETE 8 DROP CLUSTER
9 CREATE INDEX 10 DROP INDEX
11 ALTER INDEX 12 DROP TABLE
13 CREATE SEQUENCE 14 ALTER SEQUENCE
15 ALTER TABLE 16 DROP SEQUENCE
17 GRANT OBJECT 18 REVOKE OBJECT
19 CREATE SYNONYM 20 DROP SYNONYM
21 CREATE VIEW 22 DROP VIEW
23 VALIDATE INDEX 24 CREATE PROCEDURE
25 ALTER PROCEDURE 26 LOCK
27 NO-OP 28 RENAME
29 COMMENT 30 AUDIT OBJECT
31 NOAUDIT OBJECT 32 CREATE DATABASE LINK
33 DROP DATABASE LINK 34 CREATE DATABASE
35 ALTER DATABASE 36 CREATE ROLLBACK SEG
37 ALTER ROLLBACK SEG 38 DROP ROLLBACK SEG
39 CREATE TABLESPACE 40 ALTER TABLESPACE
41 DROP TABLESPACE 42 ALTER SESSION
43 ALTER USER 44 COMMIT
45 ROLLBACK 46 SAVEPOINT
47 PL/SQL EXECUTE 48 SET TRANSACTION
49 ALTER SYSTEM 50 EXPLAIN
51 CREATE USER 52 CREATE ROLE
53 DROP USER 54 DROP ROLE
55 SET ROLE 56 CREATE SCHEMA
57 CREATE CONTROL FILE 59 CREATE TRIGGER
60 ALTER TRIGGER 61 DROP TRIGGER
62 ANALYZE TABLE 63 ANALYZE INDEX
64 ANALYZE CLUSTER 65 CREATE PROFILE
66 DROP PROFILE 67 ALTER PROFILE
68 DROP PROCEDURE 70 ALTER RESOURCE COST
71 CREATE MATERIALIZED VIEW LOG 72 ALTER MATERIALIZED VIEW LOG
73 DROP MATERIALIZED VIEW LOG 74 CREATE MATERIALIZED VIEW
75 ALTER MATERIALIZED VIEW 76 DROP MATERIALIZED VIEW
77 CREATE TYPE 78 DROP TYPE
79 ALTER ROLE 80 ALTER TYPE
81 CREATE TYPE BODY 82 ALTER TYPE BODY
83 DROP TYPE BODY 84 DROP LIBRARY
85 TRUNCATE TABLE 86 TRUNCATE CLUSTER
91 CREATE FUNCTION 92 ALTER FUNCTION
93 DROP FUNCTION 94 CREATE PACKAGE
95 ALTER PACKAGE 96 DROP PACKAGE
97 CREATE PACKAGE BODY 98 ALTER PACKAGE BODY
99 DROP PACKAGE BODY 100 LOGON
101 LOGOFF 102 LOGOFF BY CLEANUP
103 SESSION REC 104 SYSTEM AUDIT
105 SYSTEM NOAUDIT 106 AUDIT DEFAULT
107 NOAUDIT DEFAULT 108 SYSTEM GRANT
109 SYSTEM REVOKE 110 CREATE PUBLIC SYNONYM
111 DROP PUBLIC SYNONYM 112 CREATE PUBLIC DATABASE LINK
113 DROP PUBLIC DATABASE LINK 114 GRANT ROLE
115 REVOKE ROLE 116 EXECUTE PROCEDURE
117 USER COMMENT 118 ENABLE TRIGGER
119 DISABLE TRIGGER 120 ENABLE ALL TRIGGERS
121 DISABLE ALL TRIGGERS 122 NETWORK ERROR
123 EXECUTE TYPE 157 CREATE DIRECTORY
158 DROP DIRECTORY 159 CREATE LIBRARY
160 CREATE JAVA 161 ALTER JAVA
162 DROP JAVA 163 CREATE OPERATOR
164 CREATE INDEXTYPE 165 DROP INDEXTYPE
167 DROP OPERATOR 168 ASSOCIATE STATISTICS
169 DISASSOCIATE STATISTICS 170 CALL METHOD
171 CREATE SUMMARY 172 ALTER SUMMARY
173 DROP SUMMARY 174 CREATE DIMENSION
175 ALTER DIMENSION 176 DROP DIMENSION
177 CREATE CONTEXT 178 DROP CONTEXT
179 ALTER OUTLINE 180 CREATE OUTLINE
181 DROP OUTLINE 182 UPDATE INDEXES
183 ALTER OPERATOR