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19、Which two can be backed up by using RMAN when a database Is open in ARCHIVELOG mode, so that me
查詢是否發(fā)生了索引碎片 SELECT object_name(dt.object_id) Tablename,si.name Indexname,dt.avg_fragmentation_in_p
57、Which two statements are true about dispatchers used by the Oracle shared server? A. Multiple
69、Which is true about unusable indexes? A. Rebuilding an unusable index always requires at least
20、Your database is using Automatic Memory Management. Which two SGA components must be managed m
【OGG】OGG基礎(chǔ)知識(shí)整理 一、GoldenGate介紹 GoldenGate軟件是一種基于日志的結(jié)構(gòu)化數(shù)據(jù)復(fù)制軟件。GoldenGate 能夠
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70、Which two are true about space management in tablespaces? A. Free lists are used for managing
65、Which three structures can span multiple data files? A. chained rows B. segments C. tempor
表碎片的來源當(dāng)針對(duì)一個(gè)表的刪除操作很多時(shí)，表會(huì)產(chǎn)生大量碎片。刪除操作釋放的空間不會(huì)被插入操作立即重用，甚至永遠(yuǎn)也不會(huì)被重用。怎樣確定是否有表碎片-- 收集表統(tǒng)計(jì)信息SQL> exec dbms_
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