"Alter index rebuild online parallel n"會修改索引的degree屬性
"Alter index rebuild online parallel n"會將索引的degree屬性修改為n，這樣可能會造成與該索引相關的執行計劃改變，可能對生產系統產生影響，因此在開併發對索引進行重構之後應該使用以下SQL將索引的degree屬性置為原來的值(例如：1)：
Alter index_name parallel 1;
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/11411056/viewspace-733800/，如需轉載，請註明出處，否則將追究法律責任。
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