ORACLE关于锁表查询的部分SQL
--查询表空间名称和大小
SELECT UPPER (F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR (ROUND ((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100, 2), '990.99') "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM ( SELECT TABLESPACE_NAME,
ROUND (SUM (BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND (MAX (BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
( SELECT DD.TABLESPACE_NAME,
ROUND (SUM (DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC;
--查看数据库引起锁表的SQL语句：
SELECT A.USERNAME,
A.MACHINE,
A.PROGRAM,
A.SID,
A.SERIAL#,
A.STATUS,
C.PIECE,
C.SQL_TEXT
FROM V$SESSION A,
V$SQLTEXT C
WHERE A.SID IN (SELECT DISTINCT T2.SID
FROM V$LOCKED_OBJECT T1,
V$SESSION T2
WHERE T1.SESSION_ID = T2.SID)
AND A.SQL_ADDRESS = C.ADDRESS(+)
ORDER BY C.PIECE;
--查看数据库锁的情况必须要有DBA权限，可以使用一下SQL 语句：
SELECT object_id, session_id, locked_mode FROM v$locked_object;
SELECT t2.username,
t2.sid,
t2.serial#,
t2.logon_time
FROM v$locked_object t1, v$session t2
WHERE t1.session_id = t2.sid
ORDER BY t2.logon_time;
--查看被锁的表
SELECT P.SPID,
A.SERIAL#,
C.OBJECT_NAME,
B.SESSION_ID,
B.ORACLE_USERNAME,
B.OS_USER_NAME
FROM V$PROCESS P,
V$SESSION A,
V$LOCKED_OBJECT B,
ALL_OBJECTS C
WHERE P.ADDR = A.PADDR
AND A.PROCESS = B.PROCESS
AND C.OBJECT_ID = B.OBJECT_ID;
--杀掉进程
ALTER SYSTEM KILL SESSION 'sid,serial#';
--查看连接数
SELECT COUNT (*) FROM v$session;
--查看并发连接数
SELECT COUNT(*) FROM V$SESSION WHERE STATUS='ACTIVE';
--查看连接的进程
SELECT SID, SERIAL#, USERNAME, OSUSER FROM V$SESSION;
--查看数据库使用的裸设备
SELECT *
FROM dba_data_files
ORDER BY file_name;
SELECT *
FROM dba_temp_files
ORDER BY file_name;
SELECT *
FROM v$controlfile
ORDER BY file_name;
SELECT *
FROM v$logfile;
--具体的方法是查询dba_data_files，dba_temp_files，v$controlfile和v$logfile看这四类文件具体占用的裸设备
--查询所有用户表使用大小的前三十名
select * from (select segment_name,bytes from dba_segments where owner = USER order by bytes desc ) where rownum <= 30;
--以下的SQL语句列出当前数据库建立的会话情况:
select sid,serial#,username,program,machine,status from v$session;
--如果DBA要手工断开某个会话，则执行:
alter system kill session 'SID,SERIAL#';
--注意，上例中SID为1到7(USERNAME列为空)的会话，是Oracle的后台进程，不要对这些会话进行任何操作。
--查询表空间有那些表:
select table_name from all_tables where tablespace_name= 'TEMP';
