| 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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原文链接：http://blog.itpub.net/29487349/viewspace-2143178/
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