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151. 如何監控 SGA 中字典緩衝區的命中率？
select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100
"miss ratio",
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
from v$rowcache
where gets+getmisses <>0
group by parameter, gets, getmisses;
152. 如何監控 SGA 中共用緩存區的命中率，應該小於1% ？
select sum(pins) "Total Pins", sum(reloads) "Total Reloads",
sum(reloads)/sum(pins) *100 libcache
from v$librarycache;
select sum(pinhits-reloads)/sum(pins) "hit
radio",sum(reloads)/sum(pins) "reload percent"
from v$librarycache;
153. 如何顯示所有資料庫物件的類別和大小？
select count(name) num_instances ,type ,sum(source_size)
source_size ,
sum(parsed_size) parsed_size ,sum(code_size) code_size
,sum(error_size) error_size,
sum(source_size) +sum(parsed_size) +sum(code_size)
+sum(error_size) size_required
from dba_object_size
group by type order by 2;
154. 監控 SGA 中重做日誌緩存區的命中率，應該小於1%
SELECT name, gets, misses, immediate_gets, immediate_misses,
Decode(gets,0,0,misses/gets*100) ratio1,
Decode(immediate_gets+immediate_misses,0,0,
immediate_misses/(immediate_gets+immediate_misses)*100) ratio2
FROM v$latch WHERE name IN (''''redo allocation'''', ''''redo copy'''');
155. 監控記憶體和硬碟的排序比率，最好使它小於 .10，增加 sort_area_size
SELECT name, value FROM v$sysstat WHERE name IN (''''sorts (memory)'''',
''''sorts (disk)'''');
156. 如何監控當前資料庫誰在運行什麽SQL語句？
SELECT osuser, username, sql_text from v$session a, v$sqltext b
where a.sql_address =b.address order by address, piece;
157. 如何監控字典緩衝區？
SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM
V$LIBRARYCACHE;
SELECT (SUM(GETS - GETMISSES - USAGE - FIXED)) / SUM(GETS) "ROW
CACHE" FROM V$ROWCACHE;
SELECT SUM(PINS) "EXECUTIONS", SUM(RELOADS) "CACHE MISSES WHILE
EXECUTING" FROM V$LIBRARYCACHE;
後者除以前者,此比率小於1%,接近0%爲好。
SELECT SUM(GETS) "DICTIONARY GETS",SUM(GETMISSES) "DICTIONARY
CACHE GET MISSES"
FROM V$ROWCACHE
158. 監控 MTS
select busy/(busy+idle) "shared servers busy" from v$dispatcher;
此值大於0.5時，參數需加大
select sum(wait)/sum(totalq) "dispatcher waits" from v$queue where
type=''''dispatcher'''';
select count(*) from v$dispatcher;
select servers_highwater from v$mts;
servers_highwater接近mts_max_servers時，參數需加大
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