V$SESSION

V$SESSION displays 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).

You can find the command name for any value n returned in this COMMAND 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
LOCKWAIT VARCHAR2(8) Address of the lock the session is waiting for; NULL if none
STATUS VARCHAR2(8) Status of the session:

  • 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:

  • DEDICATED

  • SHARED

  • PSEUDO

  • POOLED

  • NONE
SCHEMA# NUMBER Schema user identifier
SCHEMANAME VARCHAR2(30) Schema user name
OSUSER VARCHAR2(30) Operating system client user name
PROCESS VARCHAR2(24) Operating system client process ID
MACHINE VARCHAR2(64) Operating system machine name
PORT NUMBER Client port number
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
SQL_EXEC_START DATE Time when the execution of the SQL currently executed by this session started; NULL if SQL_ID is NULL
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
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
MODULEFoot 1  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 MODULE column
ACTIONFootref 1 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 ACTION column
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.
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:
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) This column provides details on whether there is a blocking session:

  • VALID - there is a blocking session, and it is identified in the BLOCKING_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 if BLOCKING_SESSION_STATUS has the value VALID.
BLOCKING_SESSION NUMBER Session identifier of the blocking session. This column is valid only if BLOCKING_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 the FINAL_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 if FINAL_BLOCKING_SESSION_STATUS has the value VALID.
FINAL_BLOCKING_SESSION NUMBER Session identifier of the blocking session. This column is valid only if FINAL_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
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 wait event parameter
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

  • -1 - Duration of the last wait was less than a hundredth of a second

  • -2 - Parameter TIMED_STATISTICS was set to false

This column has been deprecated in favor of the columns WAIT_TIME_MICRO and STATE.
SECONDS_IN_WAIT NUMBER If the session is currently waiting, then the value is the amount of time waited for the current wait. If the session is not in a wait, then the value is the amount of time since the start of the last wait.

This column has been deprecated in favor of the columns WAIT_TIME_MICRO and TIME_SINCE_LAST_WAIT_MICRO.
STATE VARCHAR2(19) Wait state:

  • WAITING - Session is currently waiting

  • WAITED UNKNOWN TIME - Duration of the last wait is unknown; this is the value when the parameter TIMED_STATISTICS is set to false

  • WAITED SHORT TIME - Last wait was less than a hundredth of a second

  • WAITED KNOWN TIME - Duration of the last wait is specified in the WAIT_TIME column
WAIT_TIME_MICRO NUMBER Amount of time waited (in microseconds). If the session is currently waiting, then the value is the time spent in the current wait. If the session is currently not in a wait, then the value is the amount of time waited in the last wait.
TIME_REMAINING_MICRO NUMBER Value is interpreted as follows:

  • > 0 - Amount of time remaining for the current wait (in microseconds)

  • 0 - Current wait has timed out

  • -1 - Session can indefinitely wait in the current wait

  • NULL - Session is not currently waiting
TIME_SINCE_LAST_WAIT_MICRO NUMBER Time elapsed since the end of the last wait (in microseconds). If the session is currently in a wait, then the value is 0.
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)
SQL_TRACE_PLAN_STATS VARCHAR2(10) Frequency at which row source statistics are dumped in the trace files for each cursor:

  • never

  • first_execution

  • all_executions
SESSION_EDITION_ID NUMBER Shows the value that, in the session, would be reported by sys_context('USERENV', 'SESSION_EDITION_ID')
CREATOR_ADDR RAW(4 | 8) Address of the creating process or circuit
CREATOR_SERIAL# NUMBER Serial number of the creating process or circuit
ECID VARCHAR2(64) Execution context identifier (sent by Application Server)

Footnote 1 The datatype of this column is VARCHAR2(64) starting with Oracle Database 11g Release 2 (11.2.0.2).

Footnote 2 The P1RAW, P2RAW, and P3RAW columns display the same values as the P1, P2, and P3 columns, except that the numbers are displayed in hexadecimal.

See Also: