Expanded DB identifier sizes (tables and columns - MDL-76459)

Update all the references to the old 28 and 30 char long limits
to the new 53 and 63 ones for Moodle 4.3 and up.

Also, add a note in the 4.3 release page, database requirements,
about the new max CFG->prefix length (10 characters).

docs/apis/plugintypes/assign/feedback.md

@@ -30,9 +30,9 @@ Assignment Feedback plugins are located in the `/mod/assign/feedback` directory.
 
 :::important Plugin naming
 
-The plugin name should be no longer than 13 characters - this is because the database tables for a submission plugin must be prefixed with `assignfeedback_[pluginname]` (15 chars + X) and the table names can be no longer than 28 chars due to a limitation with Oracle.
+The plugin name should be no longer than 38 (13 before Moodle 4.3) characters - this is because the database tables for a submission plugin must be prefixed with `assignfeedback_[pluginname]` (15 chars + X) and the table names can be no longer than 53 (28 before Moodle 4.3) chars due to a limitation with PostgreSQL.
 
-If a plugin requires multiple database tables, the plugin name will need to be shorter to allow different table names to fit under the 28 character limit.
+If a plugin requires multiple database tables, the plugin name will need to be shorter to allow different table names to fit under the 53 character limit (28 before Moodle 4.3).
 
 :::
 

docs/apis/plugintypes/assign/submission.md

@@ -30,9 +30,9 @@ Assignment Feedback plugins are located in the `/mod/assign/submission` director
 
 :::important Plugin naming
 
-The plugin name should be no longer than 11 characters - this is because the database tables for a submission plugin must be prefixed with `assignsubmission_[pluginname]` (17 chars + X) and the table names can be no longer than 28 chars due to a limitation with Oracle.
+The plugin name should be no longer than 36 (11 before Moodle 4.3) characters - this is because the database tables for a submission plugin must be prefixed with `assignsubmission_[pluginname]` (17 chars + X) and the table names can be no longer than 53 (28 before Moodle 4.3) chars due to a limitation with PostgreSQL.
 
-If a plugin requires multiple database tables, the plugin name will need to be shorter to allow different table names to fit under the 28 character limit.
+If a plugin requires multiple database tables, the plugin name will need to be shorter to allow different table names to fit under the 53 character limit (28 before Moodle 4.3).
 
 :::
 

general/development/tools/xmldb.md

@@ -76,7 +76,7 @@ Apart from the [Database Structures guidelines](https://docs.moodle.org/dev/Data
 
 1. About names:
     1. All lowercase names (tables, indexes, keys and fields).
-    1. Table names and field names must use only a-z, 0-9 and _ chars. Max 28 characters.
+    1. Table names and field names must use only a-z, 0-9 and _ chars. Max 53 characters for tables and 63 characters for fields (28 and 30 before Moodle 4.3).
     1. Key and index names under the XMLDB Files must be formed by concatenating the name of the fields present in the key/index with the '"-" (minus) character.
     1. Primary key always must be named "primary" (this is one exception to the previous convention).
     1. It's highly recommended to avoid [reserved words](https://docs.moodle.org/dev/XMLDB_reserved_words) completely. We know we have some of them now but they should be completely out for next releases.

general/releases/4.3.md

@@ -36,6 +36,8 @@ Moodle supports the following database servers. Again, version numbers are just
 | [Microsoft SQL Server](http://www.microsoft.com/en-us/server-cloud/products/sql-server/) | 2017 | Latest |
 | [Oracle Database](http://www.oracle.com/us/products/database/overview/index.html) | 19 | Latest |
 
+Note that, since Moodle 4.3, the maximum length for the database prefix (`$CFG->prefix`) is 10 characters. Installation or upgrade won't be possible with longer prefixes.
+
 ## Client requirements
 
 ### Browser support