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PS-10995 [DOCS] -[feedback] PS 8.4 Innodb index creation #700

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PS-10995 [DOCS] -[feedback] PS 8.4 Innodb index creation #700

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10 changes: 10 additions & 0 deletions docs/extended-mysqldump.md
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Expand Up @@ -17,6 +17,16 @@ More information can be found in [Backup Locks](backup-locks.md).
More information can be found in
[Compressed columns with dictionaries](compressed-columns.md).

## `InnoDB` secondary keys and `--innodb-optimize-keys`

For *InnoDB* tables, `--innodb-optimize-keys` omits secondary keys (and related
constraints) from the initial `CREATE TABLE` in the dump and adds them in a
follow-up `ALTER TABLE` after the data is loaded. That pattern works well when
the target server can build those indexes using [expanded fast index
creation](innodb-expanded-fast-index-creation.md). See that page for
limitations (foreign keys, partitioned tables, `AUTO_INCREMENT`, implicit
primary keys, and others) and for the `expand_fast_index_creation` variable.

## Taking backup by descending primary key order

–order-by-primary-desc tells `mysqldump` to take the backup by
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