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Best Practices for Oracle 11g Backup and Recovery using RMAN and Dell EqualLogic Snapshots
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Table 5 compares point-in-time recovery methods when using EqualLogic snapshots vs. Oracle
FLASHBACK DATABASE.
Table 5 – Comparison of point-in-time methods
Method RTO Impact (Refer to Figure 9 in Section 6.3)
FLASHBACK
DATABASE
Recovery time depends on transaction history. Can take significantly longer to
complete than recovery from EqualLogic snapshots.
EQL Snapshots
Time to recover is very short, and does not depend on transaction history.
Note:
Storage capacity is also impacted by each of the methods described in Table 4 and Table
5. In general, when using EqualLogic snapshots you will need to plan snapshot reserve
capacity based on how many snapshots need to be retained and the data change rate
on the database volumes from which you are creating snapshots.