Merge branch 'DOCS-mmora-master-patch-20265' into 'master'

Adding note on query optimization performance

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157376



Merged-by: Amy Qualls <aqualls@gitlab.com>
Co-authored-by: Mario Mora <mmora@gitlab.com>

doc/administration/postgresql/moving.md

@@ -40,6 +40,13 @@ To move databases from one instance to another:
    /opt/gitlab/embedded/bin/pg_dump -h $SRC_PGHOST -U $SRC_PGUSER -c -C -f praefect_production.sql praefect_production
    ```
 
+   NOTE:
+   In rare occasions, you might notice database performance issues after you perform
+   a `pg_dump` and restore. This can happen because `pg_dump` does not contain the statistics
+   [used by the optimizer to make query planning decisions](https://www.postgresql.org/docs/14/app-pgdump.html).
+   If performance degrades after a restore, fix the problem by finding the problematic query,
+   then running ANALYZE on the tables used by the query.  
+
 1. Restore the databases to the destination (this overwrites any existing databases with the same names):
 
    ```shell