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Morgan Tocker 2022-11-14 12:30:38 -07:00
parent 75a346be93
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doc/command-line-flags.md
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@ -47,7 +47,7 @@ You may want to use this on Amazon RDS.
### attempt-instant-ddl
MySQL 8.0 support "instant DDL" for some operations. If an alter statement can be completed with instant DDL, only a metadata change is required internally, so MySQL will return _instantly_ (only requiring a metadata lock to complete). Instant operations include:
MySQL 8.0 supports "instant DDL" for some operations. If an alter statement can be completed with instant DDL, only a metadata change is required internally. Instant operations include:
- Adding a column
- Dropping a column
@ -57,9 +57,9 @@ MySQL 8.0 support "instant DDL" for some operations. If an alter statement can b
It is not reliable to parse the `ALTER` statement to determine if it is instant or not. This is because the table might be in an older row format, or have some other incompatibility that is difficult to identify.
The risks of attempting to instant DDL are relatively minor: Gh-ost may need to acquire a metadata lock at the start of the operation. This is not a problem for most scenarios, but it could be a problem for users that start the DDL during a period with long running transactions.
The risks of attempting instant DDL are relatively minor: `gh-ost` may need to acquire a metadata lock at the start of the operation. This is not a problem for most scenarios, but it could be a problem for users that start the DDL during a period with long running transactions.
gh-ost will automatically fallback to the normal DDL process if the attempt to use instant DDL is unsuccessful.
`gh-ost` will automatically fallback to the normal DDL process if the attempt to use instant DDL is unsuccessful.
### conf