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faq: update br faq for restore (#16055) #16224

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Jan 23, 2024
Merged

faq: update br faq for restore (#16055) #16224

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185e11e
Update backup-and-restore-faq.md
RobertCheng-956 Dec 25, 2023
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Update faq/backup-and-restore-faq.md
RobertCheng-956 Jan 19, 2024
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Update faq/backup-and-restore-faq.md
RobertCheng-956 Jan 19, 2024
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Update faq/backup-and-restore-faq.md
qiancai Jan 23, 2024
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Expand Up @@ -330,3 +330,11 @@ If you do not execute `ANALYZE` on the table, TiDB will fail to select the optim
### Does BR back up the `SHARD_ROW_ID_BITS` and `PRE_SPLIT_REGIONS` information of a table? Does the restored table have multiple Regions?

Yes. BR backs up the [`SHARD_ROW_ID_BITS` and `PRE_SPLIT_REGIONS`](/sql-statements/sql-statement-split-region.md#pre_split_regions) information of a table. The data of the restored table is also split into multiple Regions.

## If the recovery process is interrupted, is it necessary to delete the already recovered data and start the recovery again?

No, it is not necessary. Starting from v7.1.0, BR supports resuming data from a breakpoint. If the recovery is interrupted due to unexpected circumstances, simply restart the recovery task, and it will resume from where it left off.

## After the recovery is complete, can I delete a specific table and then recover it again?

Yes, after deleting a specific table, you can recover it again. But note that, you can only recover tables that are deleted using the `DROP TABLE` or `TRUNCATE TABLE` statement, not the `DELETE FROM` statement. This is because `DELETE FROM` only updates the MVCC version to mark the data to be deleted, and the actual data deletion occurs after GC.
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