What is a DCM and its significance?

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1. What is a DCM and its significance?

SQL Server uses DCM pages to track extent modified after the last full backup operation. DCM pages track the extents modified after the full backup.DCM has a bit for every extent it tracks. If the bit is 1, the corresponding extent is modified after the last full backup, if the bit is 0, there is no change in the corresponding extent after the last full backup

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Interview Questions

1. What is a DCM and its significance?

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