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这篇文章将为大家详细讲解有关如何通过操作系统的进程号查看数据库的 session，丸趣 TV 小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
在工作中很多新手会遇到这种问题，就是操作系统显示有个 PID 占用的 CPU 很高，导致整个系统运行很慢，
同时又不敢轻易的对这个 PID 进行 KILL 操作，很是头疼。
今天就和大家分享下，怎么通过操作系统的 PID 查找相应的数据库 session 和语句。
第一步：通过可以通过操作系统的 PID 查找数据库的 v$process 进程，语句如下：
select * from v$process where SPID= PID
第二步：查找相应的 SESSION 信息
SELECT SID,SERIAL#, USERNAME,MACHINE
FROM v$session b
WHERE b.paddr = (SELECT addr
FROM v$process c
WHERE c.spid = pid )；
第三步：通过第二步查找出来的 SID，可以进一步查找正在执行的 SQL 语句
select b.sql_text
from v$session a,v$sqlarea b
where a.sql_hash_value=b.hash_value and a.sid=‘SID
另外可以通过下面这条语句查找后台进程的名字
SELECT s.SID SID, p.spid threadid, p.program processname, bg.NAME NAME
FROM v$process p, v$session s, v$bgprocess bg
WHERE p.addr = s.paddr
AND p.addr = bg.paddr
AND bg.paddr 00
经过一番查询如果发现当前的 session 有问题，具体怎么判断是否有问题，会继续介绍。
操作系统的杀进程的操作很简单，语句如下 kill -9 pid
附：V$PROCESS 和 V$SESSION 的各字段说明
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
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 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 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 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 ofROW_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 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 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. IfWAIT_TIME 0, then SECONDS_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:
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)
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