1查看数据库版本
SELECT * FROM V$VERSION;
2查看数据库语言环境
SELECT USERENV('LANGUAGE') FROM DUAL;
3查看ORACLE实例状态
SELECT INSTANCE_NAME,HOST_NAME,STARTUP_TIME,STATUS,DATABASE_STATUS
FROM V$INSTANCE;
4查看ORACLE监听状态
lsnrctl status
5查看数据库归档模式
SELECT NAME,LOG_MODE,OPEN_MODE FROM V$DATABASE;
6查看回收站中对象
SELECT OBJECT_NAME,ORIGINAL_NAME,TYPE FROM RECYCLEBIN;
7清空回收站中对象
PURGE RECYCLEBIN;
8还原回收站中的对象
FLASHBACK TABLE "BIN$GOZUQZ6GS222JZDCCTFLHQ==$0" TO BEFORE DROP RENAME TO TEST;
9闪回误删除的表
FLASHBACK TABLE AAA TO BEFORE DROP;
10闪回表中记录到某一时间点
ALTER TABLE TEST ENABLE ROW MOVEMENT;
FLASHBACK TABLE TEST TO TIMESTAMP TO_TIMESTAMP('2009-10-15 21:17:47','YYYY-MM-DD HH24:MI:SS');
11查看当前会话
SELECT SID,SERIAL#,USERNAME,PROGRAM,MACHINE,STATUS FROM V$SESSION;
12查看DDL锁
SELECT *
FROM DBA_DDL_LOCKS
WHERE OWNER = 'FWYANG';
13检查等待事件
SELECT SID, A.USERNAME, EVENT, WAIT_CLASS, T1.SQL_TEXT
FROM V$SESSION A, V$SQLAREA T1
WHERE WAIT_CLASS <> 'Idle'
AND A.SQL_ID = T1.SQL_ID;
14检查数据文件状态
SELECT FILE_NAME,STATUS FROM DBA_DATA_FILES;
15检查表空间使用情况
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;
16收缩表空间
ALTER TABLESPCE TS_AJ_DATA COALESCE;
17增加表空间大小
SELECT T.TABLESPACE_NAME, T.FILE_NAME, T.BYTES / 1024 / 1024 / 1024
FROM DBA_DATA_FILES T
WHERE T.TABLESPACE_NAME = 'TS_AJ_DATA';
ALTER TABLESPACE TS_AJ_DATA ADD DATAFILE '/DATA/TS_AJ_DATA05_10G.DBF'
SIZE 10000M
AUTOEXTEND OFF;
18检查不起作用的约束
SELECT OWNER, CONSTRAINT_NAME, TABLE_NAME, CONSTRAINT_TYPE, STATUS
FROM DBA_CONSTRAINTS
WHERE STATUS = 'DISABLE';
19检查发生坏块的数据库对象
SELECT TABLESPACE_NAME, SEGMENT_TYPE, OWNER, SEGMENT_NAME
FROM DBA_EXTENTS
WHERE FILE_ID = < AFN >
AND < BLOCK > BETWEEN BLOCK_ID AND BLOCK_ID + BLOCKS - 1;
20检查无效的数据库对象
SELECT OWNER,OBJECT_NAME,OBJECT_TYPE
FROM DBA_OBJECTS
WHERE STATUS ='INVALID';
21查看语句执行进度
SELECT SE.SID,
OPNAME,
TRUNC(SOFAR / TOTALWORK * 100, 2) || '%' AS PCT_WORK,
ELAPSED_SECONDS ELAPSED,
ROUND(ELAPSED_SECONDS * (TOTALWORK - SOFAR) / SOFAR) REMAIN_TIME,
SQL_TEXT
FROM V$SESSION_LONGOPS SL, V$SQLAREA SA, V$SESSION SE
WHERE SL.SQL_HASH_VALUE = SA.HASH_VALUE
AND SL.SID = SE.SID
AND SOFAR != TOTALWORK
ORDER BY START_TIME;
22检查碎片程度高的表
SELECT SEGMENT_NAME TABLE_NAME, COUNT(*) EXTENTS
FROM DBA_SEGMENTS
WHERE OWNER NOT IN ('SYS', 'SYSTEM')
GROUP BY SEGMENT_NAME
HAVING COUNT(*) = (SELECT MAX(COUNT(*))
FROM DBA_SEGMENTS
GROUP BY SEGMENT_NAME);
23检查表空间的 I/O 比例
SELECT DF.TABLESPACE_NAME NAME,
DF.FILE_NAME "FILE",
F.PHYRDS PYR,
F.PHYBLKRD PBR,
F.PHYWRTS PYW,
F.PHYBLKWRT PBW
FROM V$FILESTAT F, DBA_DATA_FILES DF
WHERE F.FILE# = DF.FILE_ID
ORDER BY DF.TABLESPACE_NAME;
24检查碎片程度高的表
SELECT segment_name table_name, COUNT(*) extents
FROM dba_segments
WHERE owner NOT IN ('SYS', 'SYSTEM')
GROUP BY segment_name
HAVING COUNT(*) = (SELECT MAX(COUNT(*))
FROM dba_segments
GROUP BY segment_name);
25检查文件系统的 I/O 比例
SELECT SUBSTR(A.FILE#, 1, 2) "#",
SUBSTR(A.NAME, 1, 30) "NAME",
A.STATUS,
A.BYTES,
B.PHYRDS,
B.PHYWRTS
FROM V$DATAFILE A, V$FILESTAT B
WHERE A.FILE# = B.FILE#;
26检查消耗CPU最高的进程
SELECT P.PID PID,
S.SID SID,
P.SPID SPID,
S.USERNAME USERNAME,
S.OSUSER OSNAME,
P.SERIAL# S_#,
P.TERMINAL,
P.PROGRAM PROGRAM,
P.BACKGROUND,
S.STATUS,
RTRIM(SUBSTR(A.SQL_TEXT, 1, 80)) SQLFROM
FROM V$PROCESS P, V$SESSION S, V$SQLAREA A
WHERE P.ADDR = S.PADDR
AND S.SQL_ADDRESS = A.ADDRESS(+)
AND P.SERIAL# <> '1';
27检查运行很久的SQL
SELECT USERNAME,
SID,
OPNAME,
ROUND(SOFAR * 100 / TOTALWORK, 0) || '%' AS PROGRESS,
TIME_REMAINING,
SQL_TEXT
FROM V$SESSION_LONGOPS, V$SQL
WHERE TIME_REMAINING <> 0
AND SQL_ADDRESS = ADDRESS
AND SQL_HASH_VALUE = HASH_VALUE;
28等待时间最多的5个系统等待事件的获取
SELECT *
FROM (SELECT *
FROM V$SYSTEM_EVENT
WHERE EVENT NOT LIKE 'SQL%'
ORDER BY TOTAL_WAITS DESC)
WHERE ROWNUM <= 5;
29查找前十条性能差的SQL
SELECT *
FROM (SELECT PARSING_USER_ID EXECUTIONS,
SORTS,
COMMAND_TYPE,
DISK_READS,
SQL_TEXT
FROM V$SQLAREA
ORDER BY DISK_READS DESC)
WHERE ROWNUM < 10;
30检查死锁
SELECT bs.username "Blocking User", bs.username "DB User",
ws.username "Waiting User", bs.SID "SID", ws.SID "WSID",
bs.serial# "Serial#", bs.sql_address "address",
bs.sql_hash_value "Sql hash", bs.program "Blocking App",
ws.program "Waiting App", bs.machine "Blocking Machine",
ws.machine "Waiting Machine", bs.osuser "Blocking OS User",
ws.osuser "Waiting OS User", bs.serial# "Serial#",
ws.serial# "WSerial#",
DECODE (wk.TYPE,
'MR', 'Media Recovery',
'RT', 'Redo Thread',
'UN', 'USER Name',
'TX', 'Transaction',
'TM', 'DML',
'UL', 'PL/SQL USER LOCK',
'DX', 'Distributed Xaction',
'CF', 'Control FILE',
'IS', 'Instance State',
'FS', 'FILE SET',
'IR', 'Instance Recovery',
'ST', 'Disk SPACE Transaction',
'TS', 'Temp Segment',
'IV', 'Library Cache Invalidation',
'LS', 'LOG START OR Switch',
'RW', 'ROW Wait',
'SQ', 'Sequence Number',
'TE', 'Extend TABLE',
'TT', 'Temp TABLE',
wk.TYPE
) lock_type,
DECODE (hk.lmode,
0, 'None',
1, 'NULL',
2, 'ROW-S (SS)',
3, 'ROW-X (SX)',
4, 'SHARE',
5, 'S/ROW-X (SSX)',
6, 'EXCLUSIVE',
TO_CHAR (hk.lmode)
) mode_held,
DECODE (wk.request,
0, 'None',
1, 'NULL',
2, 'ROW-S (SS)',
3, 'ROW-X (SX)',
4, 'SHARE',
5, 'S/ROW-X (SSX)',
6, 'EXCLUSIVE',
TO_CHAR (wk.request)
) mode_requested,
TO_CHAR (hk.id1) lock_id1, TO_CHAR (hk.id2) lock_id2,
DECODE
(hk.BLOCK,
0, 'NOT Blocking', /**//* Not blocking any other processes */
1, 'Blocking', /**//* This lock blocks other processes */
2, 'Global', /**//* This lock is global, so we can't tell */
TO_CHAR (hk.BLOCK)
) blocking_others
FROM v$lock hk, v$session bs, v$lock wk, v$session ws
WHERE hk.BLOCK = 1
AND hk.lmode != 0
AND hk.lmode != 1
AND wk.request != 0
AND wk.TYPE(+) = hk.TYPE
AND wk.id1(+) = hk.id1
AND wk.id2(+) = hk.id2
AND hk.SID = bs.SID(+)
AND wk.SID = ws.SID(+)
AND (bs.username IS NOT NULL)
AND (bs.username <> 'SYSTEM')
AND (bs.username <> 'SYS')
ORDER BY 1;
31查看正在运行的JOB
SELECT * FROM DBA_JOBS_RUNNING;
32检查数据库JOB的完成情况
SELECT JOB, LOG_USER, LAST_DATE, NEXT_DATE, WHAT, FAILURES
FROM DBA_JOBS;
33查看正在运行的JOB对应的SID、SERIAL#、SPID
SELECT A.JOB, B.SID, B.SERIAL#, C.SPID
FROM DBA_JOBS_RUNNING A, V$SESSION B, V$PROCESS C
WHERE A.SID = B.SID
AND B.PADDR = C.ADDR
AND JOB = '21';
34通过SID查询SERIAL#、SPID
SELECT B.SID, B.SERIAL#, C.SPID
FROM V$SESSION B, V$PROCESS C
WHERE B.SID = '554'
AND B.PADDR = C.ADDR;
35停止会话
--SID:554 SERIAL#:1134 SPID:23242
ORACLE级别:
ALTER SYSTEM KILL SESSION '554,1134';
操作系统级别:
kill -9 23242
转自 https://blog.csdn.net/sunbocong/article/details/80044982