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update br faq #6060

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Jul 30, 2021
Merged

update br faq #6060

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update br faq
IANTHEREAL Jul 30, 2021
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fix link
IANTHEREAL Jul 30, 2021
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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 @@ -22,9 +22,7 @@ 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](/br/backup-and-restore-tool.md#back-up-and-restore-table-data-in-the-mysql-system-schema-experimental-feature).
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## 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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