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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 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$PROCESS
This view contains information about the currently active processes.| Column | Datatype | Description |
|---|---|---|
ADDR |
RAW(4 | 8) |
Address of process state object |
PID |
NUMBER |
Oracle process identifier |
SPID |
VARCHAR2(12) |
Operating system process identifier |
USERNAME |
VARCHAR2(15) |
Operating system process username. Any two-task user coming across the network has "-T" appended to the username. |
SERIAL# |
NUMBER |
Process serial number |
TERMINAL |
VARCHAR2(30) |
Operating system terminal identifier |
PROGRAM |
VARCHAR2(48) |
Program in progress |
TRACEID |
VARCHAR2(255) |
Trace file identifier |
BACKGROUND |
VARCHAR2(1) |
1 for a background process; NULL for a normal process |
LATCHWAIT |
VARCHAR2(8) |
Address of latch the process is waiting for; NULL if none |
LATCHSPIN |
VARCHAR2(8) |
Address of the latch the process is spinning on; NULL if none |
PGA_USED_MEM |
NUMBER |
PGA memory currently used by the process |
PGA_ALLOC_MEM |
NUMBER |
PGA memory currently allocated by the process (including free PGA memory not yet released to the operating system by the server process) |
PGA_FREEABLE_MEM |
NUMBER |
Allocated PGA memory which can be freed |
PGA_MAX_MEM |
NUMBER |
Maximum PGA memory ever allocated by the process |
V$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 theAUDIT_ACTIONS table. |
OWNERID |
NUMBER |
The 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. |
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:
|
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 theDBMS_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 theDBMS_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 inROW_WAIT_ROW# |
ROW_WAIT_FILE# |
NUMBER |
Identifier 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# |
NUMBER |
Identifier 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# |
NUMBER |
Current 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_TIME |
DATE |
Time of logon |
LAST_CALL_ET |
NUMBER |
If the session STATUS is currentlyACTIVE, then the value represents the elapsed time in seconds since the session has become active.If the session |
PDML_ENABLED |
VARCHAR2(3) |
This column has been replaced by columnPDML_STATUS |
FAILOVER_TYPE |
VARCHAR2(13) |
Indicates whether and to what extent transparent application failover (TAF) is enabled for the session:
See Also:
|
FAILOVER_METHOD |
VARCHAR2(10) |
Indicates the transparent application failover method for the session:
|
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. IfDISABLED, PARALLEL DML enabled mode is not supported for the session. IfFORCED, the session has been altered to force PARALLEL DML. |
PDDL_STATUS |
VARCHAR2(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_STATUS |
VARCHAR2(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_DURATION |
NUMBER |
If queued (1), the current amount of time the session has been queued. If not currently queued, the value is0. |
CLIENT_IDENTIFIER |
VARCHAR2(64) |
Client identifier of the session |
BLOCKING_SESSION_STATUS |
VARCHAR2(11) |
Blocking session status:
|
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. 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. |
STATE |
VARCHAR2(19) |
Wait state:
|
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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