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update br faq (#6060) #6064

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Jul 30, 2021
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update br faq (#6060) #6064

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57d45bf
update br faq
IANTHEREAL Jul 30, 2021
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fix link
IANTHEREAL Jul 30, 2021
875e951
Update br/backup-and-restore-faq.md
TomShawn Jul 30, 2021
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4 changes: 1 addition & 3 deletions br/backup-and-restore-faq.md
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Expand Up @@ -21,9 +21,7 @@ To reduce the impact on the cluster, you can use the `--ratelimit` parameter to

## Does BR back up system tables? During data restoration, do they raise conflict?

The system schemas (`information_schema`, `performance_schema`, `mysql`) are filtered out during full backup. For more details, refer to the [Backup Principle](/br/backup-and-restore-tool.md#implementation-principles).

Because these system schemas do not exist in the backup files, no conflict occurs among system tables during data restoration.
Before v5.1.0, BR filtered out data from the system schema `mysql` during the backup. Since v5.1.0, BR **backs up** all data by default, including the system schemas `mysql.*`. But the technical implementation of restoring the system tables in `mysql.*` is not complete yet, so the tables in the system schema `mysql` are **not** restored by default. For more details, refer to the [Back up and restore table data in the `mysql` system schema (experimental feature)](/br/backup-and-restore-tool.md#back-up-and-restore-table-data-in-the-mysql-system-schema-experimental-feature).

## What should I do to handle the `Permission denied` or `No such file or directory` error, even if I have tried to run BR using root in vain?

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