V$PROCESS和V$SESSION,以及使用这两个视图能做什么

最新推荐文章于 2022-10-11 15:47:10 发布

最新推荐文章于 2022-10-11 15:47:10 发布 · 73 阅读

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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 100
COLUMN spid FORMAT A10
COLUMN username FORMAT A10
COLUMN program FORMAT A45

SELECT 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 p
WHERE   p.addr = s.paddr
AND 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" Trunc
COLUMN OSUSER      FORMAT A10 heading "Op Sys|User ID"
COLUMN USERNAME    FORMAT A8
select
B.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 C
where 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 off
set serveroutput on size 9999
column username format a20
column sql_text format a55 word_wrapped
begin
  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 999
select username
,      floor(last_call_et / 60) "Minutes"
,      status
from   v$session
where  username is not null
order 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$sqltext sql
where (sql.hash_value, sql.address) in (
       select decode(sql_hash_value, 0, prev_hash_value, sql_hash_value), decode(sql_hash_value, 0, prev_sql_addr, sql_address)
       from v$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.

Column	Datatype	Description
`ADDR`	`RAW(4 \| 8)`	Address of process state object
`PID`	`NUMBER`	Oracle process identifier
`SPID`	`VARCHAR2(12)`	Operating system process identifier
`USERNAME`	`VARCHAR2(15)`	Operating system process username. Any two-task user coming across the network has "-T" appended to the username.
`SERIAL#`	`NUMBER`	Process serial number
`TERMINAL`	`VARCHAR2(30)`	Operating system terminal identifier
`PROGRAM`	`VARCHAR2(48)`	Program in progress
`TRACEID`	`VARCHAR2(255)`	Trace file identifier
`BACKGROUND`	`VARCHAR2(1)`	`1` for a background process; NULL for a normal process
`LATCHWAIT`	`VARCHAR2(8)`	Address of latch the process is waiting for; NULL if none
`LATCHSPIN`	`VARCHAR2(8)`	Address of the latch the process is spinning on; NULL if none
`PGA_USED_MEM`	`NUMBER`	PGA memory currently used by the process
`PGA_ALLOC_MEM`	`NUMBER`	PGA memory currently allocated by the process (including free PGA memory not yet released to the operating system by the server process)
`PGA_FREEABLE_MEM`	`NUMBER`	Allocated PGA memory which can be freed
`PGA_MAX_MEM`	`NUMBER`	Maximum PGA memory ever allocated by the process

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, seeTable 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: Oracle Database Concepts for more information on TAF Oracle Database Net Services 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` - 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`)