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Why is the backup speed with 'sbt_tape' slower than 'disk'?

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edited Apr 9, 2018 7:00AM in Database 2 comments

Summary

Why is the backup speed with 'sbt_tape' slower than 'disk'?

Content

The size of datafile 5 is 30G,and the tablespace is null(no table).I backup the file with 'disk'  need 1s,but with 'sbt_tape' need 196s.

so,with my analysis,the 'sbt_tape' will read the whole file,if anyone explain the principle or Solution?

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