Shulou(Shulou.com)06/01 Report--

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

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