11、表空间实有、现有、使用情况查询对比
SELECT TABLESPACE_NAME 表空间,
TO_CHAR(ROUND(BYTES / 1024, 2), '99990.00') || '' 实有,
TO_CHAR(ROUND(FREE / 1024, 2), '99990.00') || 'G' 现有,
TO_CHAR(ROUND((BYTES - FREE) / 1024, 2), '99990.00') || 'G' 使用,
TO_CHAR(ROUND(10000 * USED / BYTES) / 100, '99990.00') || '%' 比例
FROM (SELECT A.TABLESPACE_NAME TABLESPACE_NAME,
FLOOR(A.BYTES / (1024 * 1024)) BYTES,
FLOOR(B.FREE / (1024 * 1024)) FREE,
FLOOR((A.BYTES - B.FREE) / (1024 * 1024)) USED
FROM (SELECT TABLESPACE_NAME TABLESPACE_NAME, SUM(BYTES) BYTES
FROM DBA_DATA_FILES
GROUP BY TABLESPACE_NAME) A,
(SELECT TABLESPACE_NAME TABLESPACE_NAME, SUM(BYTES) FREE
FROM DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) B
WHERE A.TABLESPACE_NAME = B.TABLESPACE_NAME)
ORDER BY FLOOR(10000 * USED / BYTES) DESC;
12、数据文件自动扩展
ALTER DATABASE DATAFILE '/oradata/zghx/TS_XMGL_DATA1.dbf' AUTOEXTEND ON NEXT 100M MAXSIZE 30000M;
13、查看回滚
select t.STATE,
t.UNDOBLOCKSDONE 已回滚,
t.UNDOBLOCKSTOTAL - t.UNDOBLOCKSDONE 剩余,
t.UNDOBLOCKSTOTAL 回滚总量
from v$fast_start_transactions t
where state = 'RECOVERING';
14、查看session 回滚大小
select a.SID,
a.USERNAME,
b.XIDUSN,
b.USED_UREC,
b.USED_UBLK,
r.RSSIZE / 1024 / 1024
from v$transaction b, v$session a, v$rollstat r
where a.SADDR = b.SES_ADDR
and b.XIDUSN = r.USN
and a.sid = 'xxx'
15、用户操作权限
SELECT *
FROM dba_TAB_PRIVS t
where t.owner not in ('SYSTEM', 'SYS', 'OUTLN', 'DBSNMP', 'PERFSTAT',
'MGMT_VIEW', 'CTXSYS', 'MDSYS', 'DMSYS', 'OLAPSYS',
'ORDSYS', 'XDB', 'WMSYS', 'SYSMAN', 'ORDPLUGINS')
order by t.owner;
在这里插入代码片
16、检查一下系统当前的锁
SELECT SID, TYPE, ID1, ID2, LMODE, REQUEST, CTIME, BLOCK
FROM V$LOCK
WHERE SID IN (SELECT SID FROM V$SESSION WHERE USERNAME IS NOT NULL);
17、查找前十条磁盘读多(性能差)的sql
SELECT SID, TYPE, ID1, ID2, LMODE, CTIME
FROM V$LOCK
WHERE ADDR IN
(SELECT ADDR FROM V$TRANSACTION WHERE START_DATE < TRUNC(SYSDATE));
18、查看占io较大的正在运行的session
SELECT se.sid,
se.serial#,
se.sql_address,
se.username,
se.status,
se.terminal,
se.program,
se.MODULE,
pr.SPID,
st.event,
st.p1text,
si.physical_reads,
si.block_changes
FROM v$session se, v$session_wait st, v$sess_io si, v$process pr
WHERE st.sid = se.sid
AND st.sid = si.sid
AND se.PADDR = pr.ADDR
AND se.sid > 6
AND st.wait_time = 0
AND st.event NOT LIKE 'SQL%'
ORDER BY physical_reads DESC;
19、查看当前有哪些用户正在使用数据
select a.osuser,
a.username,
a.machine,
b.cpu_time / b.executions / 1000000 || 's',
b.sql_text
from v$session a, v$sqlarea b
where a.sql_address = b.address
order by cpu_time / executions desc;
20、查看锁
col object_name for a35;
col machine for a30;
select object_name,
object_type,
machine,
s.sid,
s.serial#,
s.username,
s.program,
s.module,
s.status
from v$locked_object l, dba_objects o, v$session s
where l.object_id = o.object_id(+)
and l.session_id = s.sid;
21、查各session的逻辑读及物理读
col machine for a15
col module for a25
select s.sid,s.serial#,s.process,s.machine,s.module,si.block_gets,si.physical_reads
from v$session s,v$session_wait sw,v$sess_io si
where s.status='ACTIVE'
and s.sid=sw.sid(+)
and s.sid=si.sid(+)
and s.module is not null;
22、查长事务
SELECT SID,
SERIAL#,
CONTEXT,
SOFAR,
TOTALWORK,
to_char(start_time, 'yyyymmddhh24miss') strtime,
ROUND(SOFAR / TOTALWORK * 100, 2) "%_COMPLETE"
FROM V$SESSION_LONGOPS
WHERE TOTALWORK != 0
AND SOFAR <> TOTALWORK;
23、查长事务相关的SQL
select s.sid, s.serial#, q.sql_text
from v$session s, v$sql q
where s.sid in (SELECT SID
FROM V$SESSION_LONGOPS
WHERE TOTALWORK != 0
AND SOFAR <> TOTALWORK)
and s.sql_address = q.address;
24、查大量的Enqueue Wait时查哪些会话闲着
select sysdate day,
sid,
serial#,
machine,
nvl(sql_hash_value, prev_hash_value) hash_value,
last_call_et
from v$session
where sid in (select sid
from v$lock
where block = 1
UNION ALL
select sid
from v$lock
where type = 'TX'
and lmode > 1)
and last_call_et > 60
and type = 'USER'
and status <> 'ACTIVE';
25、查语句使用的临时空间
SELECT S.sid || ',' || S.serial# sid_serial,
S.username,
S.program,
T.blocks * TBS.block_size / 1024 / 1024 mb_used,
T.tablespace,
T.sqladdr address,
Q.hash_value,
Q.sql_text
FROM v$sort_usage T, v$session S, v$sql Q, dba_tablespaces TBS
WHERE T.session_addr = S.saddr
AND T.sqladdr = Q.address(+)
AND T.tablespace = TBS.tablespace_name
ORDER BY S.sid;
26、查看每个会话的UGA内存使用
select username, value || 'bytes' "Current UGA memory"
from v$session sess, v$sesstat stat, v$statname name
where sess.sid = stat.sid
and stat.statistic# = name.statistic#
and name.name = 'session uga memory';
27、查各session消耗CPU的问题
select ss.sid,
se.machine,
ss.value CPU,
se.username,
se.program,
se.process,
se.module
from v$sesstat ss, v$session se
where ss.statistic# in
(select statistic#
from v$statname
where name = 'CPU used by this session')
and se.sid = ss.sid
and ss.sid > 6
and se.module is not null
and se.status = 'ACTIVE'
order by ss.value;
28、查非并行等待语句
select s.sid, s.serial#, q.sql_text
from v$session s, v$sql q
where s.sid in (select sid
from v$session_wait
where event not like 'PX%'
and state = 'WAITING')
and s.sql_address = q.address;
29、查看各session的buffer cache hit ratio
select substr(a.username, 1, 12) "User",
a.sid "sid",
a.SERIAL#,
a.PROGRAM,
b.consistent_gets "ConsGets",
b.block_gets "BlockGets",
b.physical_reads "PhysReads",
100 * round((b.consistent_gets + b.block_gets - b.physical_reads) /
(b.consistent_gets + b.block_gets),
3) HitRatio
from v$session a, v$sess_io b
where a.sid = b.sid
and (b.consistent_gets + b.block_gets) > 0
and a.username is not null
order by HitRatio asc;
30、查询最近1个小时内的跑得时间最长的SQL
SELECT a.sql_id,
a.parsing_schema_name || '.' uname,
round(a.buffer_gets / decode(a.executions, 0, 1, a.executions)) per_bu,
TRUNC(((a.ELAPSED_TIME / decode(a.executions, 0, 1, a.executions)) /
1000000),
2) etime,
round(buffer_gets / decode(a.ROWS_PROCESSED, 0, 1, a.ROWS_PROCESSED)) buf_row,
a.executions,
a.sql_fulltext,
a.sql_text,
a.module
FROM v$sqlarea a,
(SELECT DISTINCT sql_id
FROM v$active_session_history b
WHERE b.SAMPLE_TIME BETWEEN SYSDATE - 120 / 1440 AND SYSDATE) b
WHERE a.sql_id = b.sql_id
AND a.MODULE NOT IN ('PL/SQL Developer', 'plsqldev.exe', 'ORACLE.EXE')
AND TRUNC(((a.ELAPSED_TIME / decode(a.executions, 0, 1, a.executions)) /
1000000),
2) > 100
ORDER BY 3 DESC;
31、Oracle一个大事务的SQL往往不知道运行到了哪里,可以使用如下SQL查看执行进度。
SELECT se.sid,
opname,
TRUNC(sofar / totalwork * 100, 2) pct_work,
elapsed_seconds elapsed,
ROUND(elapsed_seconds * (totalwork - sofar) / sofar) remain_time,
sql_text
FROM v$session_longops sl, v$sqlarea sa, v$session se
WHERE sl.sql_hash_value = sa.hash_value
AND sl.sid = se.sid
AND sofar != totalwork
ORDER BY start_time;
32、查询表空间的剩余量
SELECT D.TABLESPACE_NAME "表空间名",
T.EXTENT_MANAGEMENT,
T.SEGMENT_SPACE_MANAGEMENT,
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
ROUND(F.TOTAL_BYTES / 1024) "空闲大小G",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') "使用比"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D,
DBA_TABLESPACES T
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
AND D.TABLESPACE_NAME = T.TABLESPACE_NAME
--and D.TABLESPACE_NAME not in('UNDOTBS1','UNDOTBS2','UNDOTBS3','UNDOTBS4')
ORDER BY 7 DESC;
33、临时表空间
SELECT A.TABLESPACE_NAME TABLESPACE,
D.MB_TOTAL,
SUM(A.USED_BLOCKS * D.BLOCK_SIZE) / 1024 / 1024 MB_USED,
D.MB_TOTAL - SUM(A.USED_BLOCKS * D.BLOCK_SIZE) / 1024 / 1024 MB_FREE
FROM GV$SORT_SEGMENT A,
(SELECT B.NAME, C.BLOCK_SIZE, SUM(C.BYTES) / 1024 / 1024 MB_TOTAL
FROM GV$TABLESPACE B, GV$TEMPFILE C
WHERE B.TS# = C.TS#
GROUP BY B.NAME, C.BLOCK_SIZE) D
WHERE A.TABLESPACE_NAME = D.NAME
GROUP BY A.TABLESPACE_NAME, D.MB_TOTAL;
34、查询表空间的剩余量
SELECT D.TABLESPACE_NAME "表空间名",
T.EXTENT_MANAGEMENT,
T.SEGMENT_SPACE_MANAGEMENT,
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
ROUND(F.TOTAL_BYTES / 1024) "空闲大小G",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,
2),
'990.99') "使用比"
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,
DBA_TABLESPACES T
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME(+)
AND D.TABLESPACE_NAME = T.TABLESPACE_NAME
and D.TABLESPACE_NAME not in
('UNDOTBS1', 'UNDOTBS2', 'UNDOTBS3', 'UNDOTBS4')
ORDER BY 7 DESC;
35、失效索引检查
SELECT OWNER INDEX_OWNER,
INDEX_NAME,
INDEX_TYPE,
'N/A' PARTITION_NAME,
STATUS,
TABLE_NAME,
TABLESPACE_NAME
FROM DBA_INDEXES
WHERE STATUS = 'UNUSABLE'
UNION ALL
SELECT A.INDEX_OWNER,
A.INDEX_NAME,
B.INDEX_TYPE,
A.PARTITION_NAME,
A.STATUS,
B.TABLE_NAME,
A.TABLESPACE_NAME
FROM DBA_IND_PARTITIONS A, DBA_INDEXES B
WHERE A.INDEX_NAME = B.INDEX_NAME
AND A.INDEX_OWNER = B.OWNER
AND A.STATUS = 'UNUSABLE';
36、表行数，使用的块数，空的块数，块的使用率，行迁移和链接的数量，pctfree，pctused的数据，行的平均大小
select t.table_name,
t.last_analyzed,
blocks, --表中数据所占的数据块数
empty_blocks, --表中的空块数
avg_space, --数据块中平均的使用空间
chain_cnt, --表中行连接和行迁移的数量
avg_row_len, --每条记录的平均长度
t.num_rows --行数
from dba_tables t
where t.table_name = upper('emp')
and t.owner = upper('scott');