Skip to content

Update limitation.md #231

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: 8.4
Choose a base branch
from
Open

Update limitation.md #231

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 3 additions & 7 deletions docs/limitation.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -76,11 +76,7 @@ The following limitations apply to Percona XtraDB Cluster:

* Avoid reusing the names of persistent tables for temporary tables

Although MySQL does allow having temporary tables named the same as
persistent tables, this approach is not recommended.

Galera Cluster blocks the replication of those persistent tables
the names of which match the names of temporary tables.
Even though MySQL allows temporary tables to have the same names as persistent tables, using this approach is discouraged. Galera Cluster prevents replication of persistent tables with the same names as temporary tables.

With wsrep_debug set to *1*, the error log may contain the following message:

Expand All @@ -96,7 +92,7 @@ The following limitations apply to Percona XtraDB Cluster:
[MySQL Documentation: Problems with temporary tables](https://dev.mysql.com/doc/refman/{{vers}}/en/temporary-table-problems.html)


As of version 8.0.21, an INPLACE [ALTER TABLE](https://dev.mysql.com/doc/refman/{{vers}}/en/alter-table.html) query takes an internal shared lock on the table during the execution of the query. The `LOCK=NONE` clause is no longer allowed for all of the INPLACE ALTER TABLE queries due to this change.
An INPLACE [ALTER TABLE](https://dev.mysql.com/doc/refman/{{vers}}/en/alter-table.html) query takes an internal shared lock on the table during the execution of the query. Due to this change, the `LOCK=NONE` clause is no longer allowed for all `INPLACE ALTER TABLE` queries.

This change addresses a deadlock, which could cause a cluster node to hang in the following scenario:

Expand All @@ -110,4 +106,4 @@ Do not use one or more dot characters (.) when defining the values for the follo

* [log_bin_index](https://dev.mysql.com/doc/refman/{{vers}}/en/replication-options-binary-log.html#option_mysqld_log-bin-index)

MySQL and **XtraBackup** handles the value in different ways and this difference causes unpredictable behavior.
MySQL and **XtraBackup** handle the value in different ways, and this difference causes unpredictable behavior.