Add link to issue for MySQL/subgroups drop support
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@ -100,7 +100,7 @@ We currently support the following databases:
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We **highly recommend** the use of PostgreSQL instead of MySQL/MariaDB as not all
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We **highly recommend** the use of PostgreSQL instead of MySQL/MariaDB as not all
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features of GitLab may work with MySQL/MariaDB:
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features of GitLab may work with MySQL/MariaDB:
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1. MySQL support for subgroups was dropped with GitLab 9.3.
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1. MySQL support for subgroups was [dropped with GitLab 9.3][post].
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See [issue #30472][30472] for more information.
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See [issue #30472][30472] for more information.
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1. GitLab Geo does [not support MySQL](https://docs.gitlab.com/ee/gitlab-geo/database.html#mysql-replication).
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1. GitLab Geo does [not support MySQL](https://docs.gitlab.com/ee/gitlab-geo/database.html#mysql-replication).
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1. [Zero downtime migrations][zero] do not work with MySQL
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1. [Zero downtime migrations][zero] do not work with MySQL
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@ -110,6 +110,7 @@ Existing users using GitLab with MySQL/MariaDB are advised to
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[30472]: https://gitlab.com/gitlab-org/gitlab-ce/issues/30472
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[30472]: https://gitlab.com/gitlab-org/gitlab-ce/issues/30472
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[zero]: ../update/README.md#upgrading-without-downtime
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[zero]: ../update/README.md#upgrading-without-downtime
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[post]: https://about.gitlab.com/2017/06/22/gitlab-9-3-released/#dropping-support-for-subgroups-in-mysql
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### PostgreSQL Requirements
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### PostgreSQL Requirements
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@ -2,7 +2,8 @@
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>**Notes:**
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>**Notes:**
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- [Introduced][ce-2772] in GitLab 9.0.
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- [Introduced][ce-2772] in GitLab 9.0.
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- MySQL support for subgroups was dropped in GitLab 9.3.
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- Not available when using MySQL as external database (support removed in
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GitLab 9.3 [due to performance reasons][issue]).
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With subgroups (aka nested groups or hierarchical groups) you can have
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With subgroups (aka nested groups or hierarchical groups) you can have
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up to 20 levels of nested groups, which among other things can help you to:
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up to 20 levels of nested groups, which among other things can help you to:
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@ -175,3 +176,4 @@ Here's a list of what you can't do with subgroups:
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[ce-2772]: https://gitlab.com/gitlab-org/gitlab-ce/issues/2772
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[ce-2772]: https://gitlab.com/gitlab-org/gitlab-ce/issues/2772
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[permissions]: ../../permissions.md#group
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[permissions]: ../../permissions.md#group
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[reserved]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/path_regex.rb
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[reserved]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/gitlab/path_regex.rb
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[issue]: https://gitlab.com/gitlab-org/gitlab-ce/issues/30472#note_27747600
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