SQL语句大全—查看表空间

更新时间:2023-07-10 10:59:14 阅读：评论：0

数据库各个表空间增长情况的检查：
SQL >SELECT A.TABLESPACE_NAME,( 1 -(A.TOTAL)/B.TOTAL)* 100 USED_PERCENT
FROM (SELECT TABLESPACE_NAME,SUM (BYTES) TOTAL FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME) A,(SELECT TABLESPACE_NAME,SUM (BYTES) TOTAL FROM DBA_DATA_FILES GROUP BY TABLESPACE_NAME) B WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME;

SQL >SELECT UPPER(F.TABLESPACE_NAME) " 表空间名 ",
D.TOT_GROOTTE_MB " 十大蓝牙耳机品牌表空间大小 (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 ;

查看各个表空间占用磁盘情况 :
SQL >COL TABLESPACE_NAME FORMAT A20;
SQL >SELECT B.FILE_ID FILE_ID,
B.TABLESPACE_NAME TABLESPACE_NAME,
B.BYTES BYTES,
(B.BYTES-SUM (NVL(A.BYTES, 0 ))) USED,
SUM (NVL(A.BYTES, 0 )) FREE,
SUM (NVL(A.BYTES, 0 ))/(B.BYTES)* 100 PERCENT
FROM DBA_FREE_SPACE A,DBA_DATA_FILES B
WHERE A.FILE_ID=B.FILE_ID
GROUP BY B.TABLESPACE_NAME,B.FILE_ID,B.BYTES
ORDER BY B.FILE_ID;

数据库对象下一扩展与表空间的 free 扩展值的检查：
SQL >SELECT A.TABLE_NAME, A.NEXT_EXTENT, A.TABLESPACE_NAME
FROM ALL_TABLES A,(SELECT TABLESPACE_NAME, MAX (BYTES) AS BIG_CHUNK
FROM DBA_FREE_SPACE GROUP自我检讨怎么写 BY TABLESPACE_NAME ) F WHERE F.TABLESPACE_NAME = A.TABLESPACE_NAME AND A.NEXT_EXTENT > F.BIG_CHUNK
UNION SELECT A.INDEX_NAME, A.NEXT_EXTENT, A.TABLESPACE_NAME
FROM ALL_INDEXES A,(SELECT TABLESPACE_NAME, MAX (BYTES) AS BIG_CHUNK
FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME ) F WHERE F.TABLESPACE_NAME = A.TABLESPACE_NAME AND A.NEXT_EXTENT > F.BIG_CHUNK;

Disk Read 最高的 SQL 语句的获取：
SQL >SELECT SQL_TEXT FROM (SELECT * FROM V$SQLAREA ORDER BY DISK_READS)
WHERE ROWNUM <= 5 ;

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 ;

等待时间最多的 5 个系统等待事件的获取：
SQL >SELECT * FROM (SELECT * FROM V$SYSTEM_EVENT WHERE EVENT NOT LIKE 'SQL%' ORDER BY TOTAL_WAITS DESC ) WHERE ROWNUM <= 5 ;

查看当前等待事件的会话 :
COL USERNAME FORMAT A10
SET LINE 120
COL EVENT FORMAT A30
SELECT SE.SID,S.USERNAME,SE.EVENT,SE.TOTAL_WAITS,SE.TIME_WAITED,SE.AVERAGE_WAIT
FROM V$SESSION S,V$SESSION_EVENT SE WHERE S.USERNAME IS NOT NULL AND SE.SID=S.SID
AND S.STATUS= 'ACTIVE' AND SE.EVENT NOT LIKE '%SQL*NET%' ;

SELECT SID, EVENT, P1, P2, P3, WAIT_TIME, SECONDS_IN_WAIT, STATE FROM V$SESSION_WAIT WHERE EVENT NOT LIKE '%MESSAGE%' AND EVENT NOT LIKE 'SQL*NET%' AND EVENT NOT LIKE '%TIMER%' AND EVENT != 'WAKEUP TIME MANAGER' ;

找到与所连接的会话有关的当前等待事件：

SELECT SW.SID,S.USERNAME,SW.EVENT,SW.WAIT_TIME,SW.STATE,SW.SECONDS_IN_WAIT SEC_IN_WAIT
FROM V$SESSION S,V$SESSION_WAIT SW WHERE S.USERNAME IS NOT NULL AND SW.SID=S.SID
AND SW.EVENT NOT LIKE '%SQL*NET%' ORDER BY SW.WAIT_TIME DESC ;

Oracle 所有回滚段状态的检查：

SQL>SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,INITIAL_EXTENT,NEXT_EXTENT,DBA_ROLLBACK_SEGS.STATUS FROM DBA_ROLLBACK_SEGS,V$DATAFILE WHERE FILE_ID=FILE #;

Oracle 回滚段扩展信息的检查 :
COL NAME FORMAT A10
SET LINESIZE 140
SELECT SUBSTR(NAME , 1 , 40 ) NAME ,EXTENTS ,RSSIZE,OPTSIZE,AVEACTIVE,EXTENDS,WRAPS,SHRINKS,HWMSIZE
FROM V$ROLLNAME RN,V$ROLLSTAT RS WHERE (RN.USN=RS.USN);

EXTENTS : 回滚段中的盘区数量。
Rssize: 以字节为单位的回滚段的尺寸。
optsize ：为 optimal 参数设定的值。
Aveactive: 从回滚段中删除盘区时释放的以字节为单位的平均空间的大小。
Extends: 系统为回滚段增加的盘区的次数。
Shrinks: 系统从回滚段中清除盘区（即回滚段收缩）的次数。回滚段每次清除盘区时，系统可能会从这个回滚段中消除一个或多个盘区。
Hwmsize: 回滚段尺寸的上限，即回滚段曾经达到的最大尺寸。
注意安全图片( 如果回滚段平均尺寸接近 OPTIMAL 的值，那么说明 OPTIMAL 的值设置正确，如果回滚段动态增长次数或收缩次数很高，那么需要提高 OPTIMAL 的值 )

查看回滚段的使用情况，哪个用户正在使用回滚段的资源 :
SELECT S.USERNAME, U.NAME FROM V$TRANSACTION T,V$ROLLSTAT R,
V$ROLLNAME U,V$SESSION S WHERE S.TADDR=T.ADDR AND
T.XIDUSN=R.USN AND R.USN=U.USN ORDER BY S.USERNAME;

如何查看一下某个 shared_rver 正在忙什么 :
SELECT A.USERNAME,A.MACHINE,A.PROGRAM,A.SID,
A.SERIAL#,A.STATUS,C.PIECE,C.SQL_TEXT
FROM V$SESSION A,V$PROCESS B,V$SQLTEXT C
WHERE B.SPID= 13161 AND B.ADDR=A.PADDR
AND A.SQL_ADDRESS=C.ADDRESS(+) ORDER BY C.PIECE;

数据库共享池性能检查 :
SELECT NAMESPACE,GETS,GETHITRATIO,PINS,PINHITRATIO,RELOADS,INVALIDATIONS FROM V$LIBRARYCACHE WHERE NAMESPACE IN ( 'SQLAREA' , 'TABLE/PROCEDURE' , 'BODY' , 'TRIGGER' );

检查数据重载比率 :
SELECT SUM (RELOADS)/SUM (PINS)* 100 "RELOAD RATIO" FROM
V$LIBRARYCACHE;

检查数据字典的命中率 :
SELECT 1 -SUM (GETMISSES)/SUM (GETS) "DATA DICTIONARY HIT
RATIO" FROM V$ROWCACHE;
( 对于 library cache, gethitratio 和 pinhitratio 应该大于 90%, 对于数据重载比率 ,reload ratio 应该小于 1%, 对于数据字典的命中率 ,data dictionary hit ratio 应该大于 85%)

检查共享内存的剩余情况 :
SELECT REQUEST_MISSES, REQUEST_FAILURES FROM V$SHARED_POOL_RESERVED;
( 对于共享内存的剩余情况 , request_miss 和 request_failures 应该接近 0)

数据高速缓冲区性能检查 :
SELECT 1 -P.VALUE /(B.VALUE +C.VALUE ) "DB BUFFER CACHE HIT RATIO" FROM V$SYSSTAT P,V$SYSSTAT B,V$SYSSTAT C WHERE P.NAME = 'PHYSICAL READS' AND B.NAME = 'DB BLOCK GETS' AND C.NAME = 'CONSISTENT GETS' ;

检查 buffer pool HIT_RATIO 执行
SELECT NAME , (PHYSICAL_READS/(DB_BLOCK_GETS+CONSISTENT_GETS)) "MISS_HIT_RATIO" FROM V$BUFFER_POOL_STATISTICS WHERE老师的乳汁 (DB_BLOCK_GETS+ CONSISTENT_GETS)> 0 ;
( 正常时 db buffer cache hit ratio 应该大于 90%, 正常时 buffer pool MISS_HIT_RATIO 应该小于 10%)

数据库回滚段性能检查 :
检查 Ratio 执行
SELECT SUM (WAITS)* 100 钢铁是怎样炼成的读后感/SUM (GETS) "RATIO", SUM (WAITS) "WAITS", SUM (GETS) "GETS" FROM V$ROLLSTAT;

检查 count/value 执行 :
SELECT CLASS ,COUNT FROM V$WAITSTAT WHERE CLASS LIKE '%UNDO%' ;
SELECT VALUE FROM V$SYSSTAT WHERE NAME = 'CONSISTENT GETS' ;
( 两者的 value 值相除 )

检查 average_wait 执行 :
SELECT EVENT,TOTAL_WAITS,TIME_WAITED,AVERAGE_WAIT FROM V$SYSTEM_EVENT WHERE EVENT LIKE '%UNDO%' ;

检查 RBS header get ratio 执行 :
SELECT N.NAME ,S.USN,S.WRAPS, DECODE(S.WAITS, 0 , 1 , 1 - S.WAITS/S.GETS)"RBS HEADER GET RATIO" FROM V$ROLLSTAT S,V$ROLLNAME N WHERE S.USN=N.USN;
( 正常时 Ratio 应该小于 1%, count/value 应该小于 0.01%,average_wait 最好为 0 ，该值越小越好 ,RBS header get ratio 应该大于 95%)

杀会话的脚本 :
SELECT A.SID,B.SPID,A.SERIAL#,A.LOCKWAIT,A.USERNAME,A.OSUSER,A.LOGON_TIME,A.LAST_CALL_ET/ 3600 LAST_HOUR,A.STATUS, 'ORAKILL ' ||SID|| ' ' ||SPID HOST_COMMAND, 'ALTER SYSTEM KILL SESSION ''' ||A.SID|| ',' ||A.SERIAL#|| '''' SQL_COMMAND FROM V$SESSION A,V$PROCESS B WHERE A.PADDR=B.ADDR AND SID> 6 ;

查看排序段的性能 :
SQL >SELECT NAME , VALUE FROM V$SYSSTAT WHERE NAME IN ( 'SORTS (MEMORY)' , 'SORTS (DISK)' );

7 、查看数据库库对象 :
SELECT OWNER, OBJECT_TYPE, STATUS, COUNT (*) COUNT # FROM ALL_OBJECTS GROUP BY OWNER, OBJECT_TYPE, STATUS;

8 、查看数据库的版本 : 　
SELECT * FROM V$VERSION;

9 、查看数据库的创建日期和归档方式 :
SELECT CREATED, LOG_MODE, LOG_MODE FROM V$DATABASE;

10 、捕捉运行很久的 SQL:
COLUMN USERNAME FORMAT A12
COLUMN OPNAME FORMAT A16
COLUMN PROGRESS FORMAT A8 300字自我介绍
SELECT USERNAME,SID,OPNAME,ROUND(SOFAR* 100 / TOTALWORK, 0 ) || '%' AS PROGRESS,TIME_REMAINING,SQL_TEXT 尿多尿频是什么原因FROM V$SESSION_LONGOPS , V$SQL WHERE TIME_REMAINING <> 0 AND SQL_ADDRESS=ADDRESS AND SQL_HASH_VALUE = HASH_VALUE;

11 、查看数据表的参数信息 :
SELECT PARTITION_NAME, HIGH_VALUE, HIGH_VALUE_LENGTH, TABLESPACE_NAME,PCT_FREE, PCT_USED, INI_TRANS, MAX_TRANS, INITIAL_EXTENT,NEXT_EXTENT, MIN_EXTENT, MAX_EXTENT, PCT_INCREASE, FREELISTS ,FREELIST_GROUPS, LOGGING , BUFFER_POOL , NUM_ROWS, BLOCKS,EMPTY_BLOCKS, AVG_SPACE, CHAIN_CNT, AVG_ROW_LEN, SAMPLE_SIZE,LAST_ANALYZED FROM DBA_TAB_PARTITIONS
--WHERE TABLE_NAME = :TNAME AND TABLE_OWNER = :TOWNER
ORDER BY PARTITION_POSITION;

12 、查看还没提交的事务 :
SELECT * FROM V$LOCKED_OBJECT;
SELECT * FROM V$TRANSACTION;

13 、查找 object 为哪些进程所用 :
SELECT P.SPID,S.SID,S.SERIAL# SERIAL_NUM,S.USERNAME USER_NAME,
A.TYPE OBJECT_TYPE,S.OSUSER OS_USER_NAME,A.OWNER,A.OBJECT OBJECT_NAME,DECODE(SIGN( 48 - COMMAND), 1 ,
TO_CHAR(COMMAND), 'ACTION CODE #' || TO_CHAR(COMMAND) ) ACTION,
P.PROGRAM ORACLE_PROCESS,S.TERMINAL TERMINAL,S.PROGRAM PROGRAM,S.STATUS SESSION_STATUS FROM V$SESSION S, V$ACCESS A, V$PROCESS P WHERE S.PADDR = P.ADDR AND S.TYPE = 'USER' AND A.SID = S.SID AND A.OBJECT = 'SUBSCRIBER_ATTR' ORDER BY S.USERNAME, S.OSUSER;

14 、查看回滚段 :
SQL >COL NAME FORMAT A10
SQL >SET LINESIZE 100
SQL >SELECT ROWNUM , SYS .DBA_ROLLBACK_SEGS.SEGMENT_NAME NAME , V$ROLLSTAT.EXTENTS EXTENTS , V$ROLLSTAT.RSSIZE SIZE_IN_BYTES, V$ROLLSTAT.XACTS XACTS, V$ROLLSTAT.GETS GETS, V$ROLLSTAT.WAITS WAITS, V$ROLLSTAT.WRITES WRITES, SYS .DBA_ROLLBACK_SEGS.STATUS STATUS FROM V$ROLLSTAT, SYS .DBA_ROLLBACK_SEGS, V$ROLLNAME WHERE V$ROLLNAME.NAME (+) = SYS .DBA_ROLLBACK_SEGS.SEGMENT_NAME AND V$ROLLSTAT.USN (+) = V$ROLLNAME.USN ORDER BY ROWNUM ;

15 、耗资源的进程 (top ssion):
SELECT S.SCHEMANAME SCHEMA_NAME,DECODE(SIGN( 48 - COMMAND), 1 , TO_CHAR(COMMAND), 'ACTION CODE #' || TO_CHAR(COMMAND) ) ACTION,STATUS SESSION_STATUS,S.OSUSER OS_USER_NAME,S.SID,P.SPID,S.SERIAL# SERIAL_NUM,NVL(S.USERNAME, '[ORACLE PROCESS]' ) USER_NAME,S.TERMINAL TERMINAL,S.PROGRAM PROGRAM,ST.VALUE CRITERIA_VALUE FROM V$SESSTAT ST,V$SESSION S,V$PROCESS P WHERE ST.SID = S.SID AND ST.STATISTIC# = TO_NUMBER( '38' ) AND ( 'ALL' = 'ALL' OR S.STATUS = 'ALL' ) AND P.ADDR=S.PADDR ORDER BY ST.VALUE DESC ,P.SPID ASC ,S.USERNAME ASC ,S.OSUSER ASC ;

根据 PID 查找相应的语句 :

SELECT A.USERNAME, A.MACHINE,A.PROGRAM,A.SID,A.SERIAL#,A.STATUS,C.PIECE,C.SQL_TEXT FROM V$SESSION A,V$PROCESS B,V$SQLTEXT C WHERE B.SPID=SPID AND B.ADDR=A.PADDR AND A.SQL_ADDRESS=C.ADDRESS(+) ORDER BY C.PIECE;

>进口奶粉

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标签：回滚查看检查数据库情况空间

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