When you issue "ALTER TABLESPACE xxx READ ONLY",what will oracle do?
- acquire AT lock exclusive
- set datafile not modifyable
- Wait on any active TX to commit
(If a TX touches the tablespace at this time it gets ORA-372)
- Finish off updating TS to read only
- Release AT lock
AT lock是tablespace的enqueue，目的是序列化對錶空間的併發操作
[@more@]來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/85922/viewspace-899155/，如需轉載，請註明出處，否則將追究法律責任。
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