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【W(wǎng)AIT】wait event

發(fā)布時間：2020-08-11 23:34:08 來源：ITPUB博客 閱讀：153 作者：xysoul_云龍 欄目：關(guān)系型數(shù)據(jù)庫
 
Wait Event R/W Synchronous
/Asynchronous 		Singleblock/
Multiblock 		Elapsed Time
(with 1000+ waits per hour)
control file parallel write

Write

Asynchronous Multi < 15ms
control file sequential read

Read

Synchronous Single < 20 ms
db file parallel read Read Asynchronous Multi < 20 ms
db file scattered read Read Synchronous Multi < 20 ms
db file sequential read Read Synchronous Single < 20 ms
direct path read Read Asynchronous Multi < 20 ms
direct path read temp Read Asynchronous Multi < 20 ms
direct path write Write Asynchronous Multi < 15 ms
direct path write temp Write Asynchronous Multi < 15 ms
log file parallel write Write Asynchronous Multi < 15 ms
         

Exadata Related

       
         
cell smart table scan Read Asynchronous Multi < 1 ms
cell single block physical read Read Synchronous Single < 1 ms
cell multiblock physical read Read Synchronous Multi < 6 ms
         
         
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