V$PROCESS和V$SESSION,以及使用这两个视图能做什么

使用V$PROCESS，V$SESSION能做什么

查看哪些用户连到了DB上，使用什么Program连接

SET LINESIZE 100COLUMN spid FORMAT A10COLUMN username FORMAT A10COLUMN program FORMAT A45SELECT s.sid, --Session identifier       s.serial#,--Session serial number. Used to uniquely identify a session's objects.       p.spid, --Operating system process identifier       p.pid, --Oracle process identifier       s.username,--Oracle DB username       s.osuser,--Operating system client user name       s.TERMINAL,--Operating system terminal name       s.program,--Operating system program name       s.STATUS--Status of the session.ACTIVE,INACTIVE,KILLED,CACHED,SNIPED   FROM   v$session s,v$process pWHERE   p.addr = s.paddrAND s.type != 'BACKGROUND';

Sample Output:

Kill Session

Column SID         FORMAT 9999999 heading "Sess|ID "COLUMN SERIAL#     FORMAT 9999999  heading "Serial# "COLUMN OBJECT_NAME FORMAT A17 heading "OBJ NAME or|TRANS_ID" TruncCOLUMN OSUSER      FORMAT A10 heading "Op Sys|User ID"COLUMN USERNAME    FORMAT A8selectB.SID,C.SERIAL#,C.USERNAME,C.OSUSER,DECODE(B.ID2, 0, A.OBJECT_NAME,'Trans-'||to_char(B.ID1)) OBJECT_NAME,B.TYPE,DECODE(B.LMODE,0,'--Waiting--',               1,'Null',               2,'Row Share',               3,'Row Excl',               4,'Share',               5,'Sha Row Exc',               6,'Exclusive',                 'Other') "Lock Mode",DECODE(B.REQUEST,0,' ',                 1,'Null',                 2,'Row Share',                 3,'Row Excl',                 4,'Share',                 5,'Sha Row Exc',                 6,'Exclusive',                   'Other') "Req Mode"from DBA_OBJECTS A, V$LOCK B, V$SESSION Cwhere A.OBJECT_ID = B.ID1    and B.SID = C.SID    and C.USERNAME is not null    and A.object_name like upper('inv_rcv_std%') /select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;--查看锁--kill session的基本语法是:alter system kill session 'sid,serial#';--把锁给KILL掉,下边的例子146为sid，21177为serial#alter system kill session '146,21177';

All active sql

set feedback offset serveroutput on size 9999column username format a20column sql_text format a55 word_wrappedbegin  for x in   (select username||'('||sid||','||serial#||') ospid = '|| process ||    ' program = ' || program username,    to_char(LOGON_TIME,' Day HH24:MI') logon_time,    to_char(sysdate,' Day HH24:MI') current_time,    sql_address,    sql_hash_value   from v$session   where status = 'ACTIVE'   and rawtohex(sql_address) <> '00'   and username is not null ) loop   for y in (select sql_text   from v$sqlarea   where address = x.sql_address ) loop   if ( y.sql_text not like '%listener.get_cmd%' and    y.sql_text not like '%RAWTOHEX(SQL_ADDRESS)%' ) then    dbms_output.put_line( '--------------------' );    dbms_output.put_line( x.username );    dbms_output.put_line( x.logon_time || ' ' || x.current_time || ' SQL#=' || x.sql_hash_value);    dbms_output.put_line( substr( y.sql_text, 1, 250 ) );   end if;  end loop; end loop;end;/

Time since last user activity

set lines 100 pages 999select username,      floor(last_call_et / 60) "Minutes",      statusfrom   v$sessionwhere  username is not nullorder by last_call_et

已知spid，查看当前正在执行或最近一次执行的语句

select /*+ ordered */ sql_text from v$sqltext sqlwhere (sql.hash_value, sql.address) in (       select decode(sql_hash_value, 0, prev_hash_value, sql_hash_value), decode(sql_hash_value, 0, prev_sql_addr, sql_address)       from v$session s where s.paddr = (select addr from v$process p where p.spid = to_number('&pid')))       order by piece asc;

v$session join v$process

两个视图的关联方式

select x

FROM   v$session s,v$process p
WHERE   p.addr = s.paddr

Difference between V$Process and v$session

Tom said:
a process can have many sessions.
a session may or may not have a process.

I can use connection multi-plexing to have one physical connection to the database with a single dedicated server (process) and have many sessions going.

I can have a session via a shared server whereby unless I'm active -- I don't have a process (many sessions share a process).

So a process is a process and a session is a session.  A session eventually needs a process, is not tied to a single process.  A process can have zero one or more sessions using it.

Source:Bhavani -- Thanks for the question regarding "Difference between V$Process and v$session"

V$PROCESS

This view contains information about the currently active processes.
ColumnDatatypeDescriptionADDRRAW(4 | 8)Address of process state objectPIDNUMBEROracle process identifierSPIDVARCHAR2(12)Operating system process identifierUSERNAMEVARCHAR2(15)Operating system process username. Any two-task user coming across the network has "-T" appended to the username.SERIAL#NUMBERProcess serial numberTERMINALVARCHAR2(30)Operating system terminal identifierPROGRAMVARCHAR2(48)Program in progressTRACEIDVARCHAR2(255)Trace file identifierBACKGROUNDVARCHAR2(1)1 for a background process; NULL for a normal processLATCHWAITVARCHAR2(8)Address of latch the process is waiting for; NULL if noneLATCHSPINVARCHAR2(8)Address of the latch the process is spinning on; NULL if nonePGA_USED_MEMNUMBERPGA memory currently used by the processPGA_ALLOC_MEMNUMBERPGA memory currently allocated by the process (including free PGA memory not yet released to the operating system by the server process)PGA_FREEABLE_MEMNUMBERAllocated PGA memory which can be freedPGA_MAX_MEMNUMBERMaximum PGA memory ever allocated by the process

V$SESSION

This view lists session information for each current session.

ColumnDatatypeDescriptionSADDRRAW(4 | 8)Session addressSIDNUMBERSession identifierSERIAL#NUMBERSession 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.AUDSIDNUMBERAuditing session IDPADDRRAW(4 | 8)Address of the process that owns the sessionUSER#NUMBEROracle user identifierUSERNAMEVARCHAR2(30)Oracle usernameCOMMANDNUMBERCommand in progress (last statement parsed); for a list of values, seeTable 7-5. These values also appear in theAUDIT_ACTIONS table.OWNERIDNUMBERThe column contents are invalid if the value is2147483644. 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.

TADDRVARCHAR2(8)Address of transaction state objectLOCKWAITVARCHAR2(8)Address of lock waiting for; null if noneSTATUSVARCHAR2(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

SERVERVARCHAR2(9)Server type (DEDICATED|SHARED|PSEUDO|NONE)SCHEMA#NUMBERSchema user identifierSCHEMANAMEVARCHAR2(30)Schema user nameOSUSERVARCHAR2(30)Operating system client user namePROCESSVARCHAR2(12)Operating system client process IDMACHINEVARCHAR2(64)Operating system machine nameTERMINALVARCHAR2(30)Operating system terminal namePROGRAMVARCHAR2(48)Operating system program nameTYPEVARCHAR2(10)Session typeSQL_ADDRESSRAW(4 | 8)Used with SQL_HASH_VALUE to identify the SQL statement that is currently being executedSQL_HASH_VALUENUMBERUsed with SQL_ADDRESS to identify the SQL statement that is currently being executedSQL_IDVARCHAR2(13)SQL identifier of the SQL statement that is currently being executedSQL_CHILD_NUMBERNUMBERChild number of the SQL statement that is currently being executedPREV_SQL_ADDRRAW(4 | 8)Used with PREV_HASH_VALUE to identify the last SQL statement executedPREV_HASH_VALUENUMBERUsed with SQL_HASH_VALUE to identify the last SQL statement executedPREV_SQL_IDVARCHAR2(13)SQL identifier of the last SQL statement executedPREV_CHILD_NUMBERNUMBERChild number of the last SQL statement executedMODULEVARCHAR2(48)Name of the currently executing module as set by calling theDBMS_APPLICATION_INFO.SET_MODULE procedureMODULE_HASHNUMBERHash value of the above MODULEACTIONVARCHAR2(32)Name of the currently executing action as set by calling theDBMS_APPLICATION_INFO.SET_ACTION procedureACTION_HASHNUMBERHash value of the above action nameCLIENT_INFOVARCHAR2(64)Information set by the DBMS_APPLICATION_INFO.SET_CLIENT_INFO procedureFIXED_TABLE_SEQUENCENUMBERThis 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#NUMBERObject ID for the table containing the row specified inROW_WAIT_ROW#ROW_WAIT_FILE#NUMBERIdentifier for the datafile containing the row specified inROW_WAIT_ROW#. This column is valid only if the session is currently waiting for another transaction to commit and the value ofROW_WAIT_OBJ# is not -1.ROW_WAIT_BLOCK#NUMBERIdentifier for the block containing the row specified inROW_WAIT_ROW#. This column is valid only if the session is currently waiting for another transaction to commit and the value ofROW_WAIT_OBJ# is not -1.ROW_WAIT_ROW#NUMBERCurrent row being locked. This column is valid only if the session is currently waiting for another transaction to commit and the value ofROW_WAIT_OBJ# is not-1.LOGON_TIMEDATETime of logonLAST_CALL_ETNUMBERIf the session STATUS is currentlyACTIVE, 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_ENABLEDVARCHAR2(3)This column has been replaced by columnPDML_STATUSFAILOVER_TYPEVARCHAR2(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:

• Oracle Database Concepts for more information on TAF

• Oracle Database Net Services Administrator's Guide for information on configuring TAF

FAILOVER_METHODVARCHAR2(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_OVERVARCHAR2(3)Indicates whether the session is running in failover mode and failover has occurred (YES) or not (NO)RESOURCE_CONSUMER_GROUPVARCHAR2(32)Name of the session's current resource consumer groupPDML_STATUSVARCHAR2(8)If ENABLED, the session is in a PARALLEL DML enabled mode. IfDISABLED, PARALLEL DML enabled mode is not supported for the session. IfFORCED, the session has been altered to force PARALLEL DML.PDDL_STATUSVARCHAR2(8)If ENABLED, the session is in a PARALLEL DDL enabled mode. IfDISABLED, PARALLEL DDL enabled mode is not supported for the session. IfFORCED, the session has been altered to force PARALLEL DDL.PQ_STATUSVARCHAR2(8)If ENABLED, the session is in a PARALLEL QUERY enabled mode. IfDISABLED, PARALLEL QUERY enabled mode is not supported for the session. IfFORCED, the session has been altered to force PARALLEL QUERY.CURRENT_QUEUE_DURATIONNUMBERIf queued (1), the current amount of time the session has been queued. If not currently queued, the value is0.CLIENT_IDENTIFIERVARCHAR2(64)Client identifier of the sessionBLOCKING_SESSION_STATUSVARCHAR2(11)Blocking session status:

• VALID

• NO HOLDER

• GLOBAL

• NOT IN WAIT

• UNKNOWN

BLOCKING_INSTANCENUMBERInstance identifier of blocking sessionBLOCKING_SESSIONNUMBERSession identifier of blocking sessionSEQ#NUMBERSequence number that uniquely identifies the wait. Incremented for each wait.EVENT#NUMBEREvent numberEVENTVARCHAR2(64)Resource or event for which the session is waiting

See Also: Appendix C, "Oracle Wait Events"

P1TEXTVARCHAR2(64)Description of the first additional parameterP1NUMBERFirst additional parameterP1RAWRAW(4)First additional parameterP2TEXTVARCHAR2(64)Description of the second additional parameterP2NUMBERSecond additional parameterP2RAWRAW(4)Second additional parameterP3TEXTVARCHAR2(64)Description of the third additional parameterP3NUMBERThird additional parameterP3RAWRAW(4)Third additional parameterWAIT_CLASS_IDNUMBERIdentifier of the wait classWAIT_CLASS#NUMBERNumber of the wait classWAIT_CLASSVARCHAR2(64)Name of the wait classWAIT_TIMENUMBERA nonzero value is the session's last wait time. A zero value means the session is currently waiting.SECONDS_IN_WAITNUMBERIf WAIT_TIME = 0, then SECONDS_IN_WAIT is the seconds spent in the current wait condition. IfWAIT_TIME >0, thenSECONDS_IN_WAIT is the seconds since the start of the last wait, andSECONDS_IN_WAIT -WAIT_TIME /100 is the active seconds since the last wait ended.STATEVARCHAR2(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_NAMEVARCHAR2(64)Service name of the sessionSQL_TRACEVARCHAR2(8)Indicates whether SQL tracing is enabled (ENABLED) or disabled (DISABLED)SQL_TRACE_WAITSVARCHAR2(5)Indicates whether wait tracing is enabled (TRUE) or not (FALSE)SQL_TRACE_BINDSVARCHAR2(5)Indicates whether bind tracing is enabled (TRUE) or not (FALSE)

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