Oracle monitoring script statement
View highly fragmented tables
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)
Find users who use CPU more than others
Session select a. Sidgery spidgery statuspr substr (a. Programmel 1 pas 40) prog,a.terminal,osuser,value/60/100 value
From v$session a recordsesstat c
Where c.statistic#=12 and c.sid=a.sid and a.paddr=b.addr order by value desc
Contention of rollback segment
Select name, waits, gets, waits/gets "Ratio"
From v$rollstat a, v$rollname b
Where a.usn = b.usn
The hit rate of monitoring SGA shared cache should be less than 1%.
Select sum (pins) "Total Pins"
Sum (reloads) "Total Reloads"
Sum (reloads) / sum (pins) * 100 libcache
Sum (pinhits-reloads) / sum (pins) "hit radio"
Sum (reloads) / sum (pins) "reload percent"
From v$librarycache
The hit rate of the redo log cache in monitoring SGA should be less than 1%.
SELECT name, gets, misses, immediate_gets, immediate_misses
Decode (gets,0,0,misses/gets*100) ratio1
Decode (immediate_gets+immediate_misses,0,0
Immediate_misses/ (immediate_gets+immediate_misses) * 100) ratio2
FROM v$latch WHERE name IN ('redo allocation',' redo copy')
Monitor the use of log_buffer
Select name,value from v$sysstat where name in ('redo entries','redo buffer allocation retries')
Monitor the hit rate of database buffers in SGA
Select a.value + b.value "logical_reads", c.value "phys_reads"
Round ((a.value+b.value)-c.value) / (a.value+b.value)) "BUFFER HIT RATIO"
From v$sysstat a, v$sysstat b, v$sysstat c
Where a.statistic# = 38 and b.statistic# = 39
And c.statistic# = 40
Monitor the IO ratio of tablespaces
Select df.tablespace_name name,df.file_name "ile", f.phyrds pyr
F.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw
From v$filestat f, dba_data_files df
Where f.file# = df.file_id
Order by df.tablespace_name
Monitor tablespace utilization
SELECT UPPER (F.TABLESPACE_NAME) "tablespace name"
D.TOT_GROOTTE_MB Tablespace size (M)
D.TOT_GROOTTE_MB-F.TOTAL_BYTES "Space used (M)"
ROUND ((D.TOT_GROOTTE_MB-F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100J 2) "usage ratio"
F.TOTAL_BYTES "Free Space"
F.MAX_BYTES "maximum Block (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
Monitor who is running what SQL statements in the current database
SELECT osuser, username, sql_text
From v$session a, v$sqltext b
Where a.sql_address = b.address
Order by address, piece
Monitor waiting events
Select event,sum (decode (wait_Time,0,0,1)) "rev"
Sum (decode (wait_Time,0,1,0)) "Curr", count (*) "Tot"
From v$session_Wait
Group by event order by 4
Monitor the sorting ratio of memory to hard disk
SELECT name, value
FROM v$sysstat
WHERE name IN ('sorts (memory)', 'sorts (disk)')
Monitor the IO ratio of the file system
"#" select substr (a.filemagic pr 1pr 2), substr (a.namemere 1pr 30) "Name"
A.status, a.bytes, b.phyrds, b.phywrts
From v$datafile a, v$filestat b
Where a.file# = b.file#
Find all the indexes under a user
Select user_indexes.table_name
User_indexes.index_name
Uniqueness
Column_name
From user_ind_columns, user_indexes
Where user_ind_columns.index_name = user_indexes.index_name
And user_ind_columns.table_name = user_indexes.table_name
Order by user_indexes.table_type
User_indexes.table_name
User_indexes.index_name
Column_position
