The following InnoDB file format configuration parameters were deprecated
in MySQL 5.7.7 and are now removed:
- innodb_file_format
- innodb_file_format_check
- innodb_file_format_max
- innodb_large_prefix
File format configuration parameters were necessary for creating tables
compatible with earlier versions of InnoDB in MySQL 5.1.
Now that MySQL 5.1 has reached the end of its product lifecycle,
the parameters are no longer required.
The FILE_FORMAT column was removed from the INNODB_SYS_TABLES and
INNODB_SYS_TABLESPACES Information Schema tables.
Ref: https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-0.html
When updating the mysql system to utf8mb4 not all tables are
converted to the row format of compressed or dynamic. If a new
index is created there is a possibility that the table could be
using compact or redundant and then an error will be shown saying
that the index size is too large. This fix handles this exception
and converts the table over to compressed.
- With the patch, 6 positions of scale accuracy are guaranteed
per individual casted value.
- Backed with unit tests, both for varchar and clob.
- Added 2 missing tests about uses of the method with params
and values.
Note: 6 was picked because looking to all databases implementation
postgres was found to be casting to real, aka, 6.
When insert_record is called and it doesn't find any columns
to insert data into, that is a dml_exception as you need at least
one column in the database to insert into it. This can happen
when you have created a zero column database table, or the table
does not exist.
Includes following fixes:
* support for MS SQL Server
* optional trimming of of oversized VARCHAR fields
* conversion to forms library
* full localisation
* other cleanup
List of changes:
* New OOP API using PHP namespace \core\session\.
* All handlers now update the sessions table consistently.
* Experimental DB session support in Oracle.
* Full support for session file handler (filesystem locking required).
* New option for alternative session directory.
* Official memcached session handler support.
* Workaround for memcached version with non-functional gc.
* Improved security - forced session id regeneration.
* Improved compatibility with recent PHP releases.
* Fixed borked CSS during install in debug mode.
* Switched to file based sessions in new installs.
* DB session setting disappears if DB does not support sessions.
* DB session setting disappears if session handler specified in config.php.
* Fast purging of sessions used in request only.
* No legacy distinction - file, database and memcached support the same functionality.
* Session handler name included in performance info.
* Fixed user_loggedin and user_loggedout event triggering.
* Other minor bugfixing and improvements.
* Fixed database session segfault if MUC disposed before $DB.
Limitations:
* Session access time is now updated right after session start.
* Support for $CFG->sessionlockloggedinonly was removed.
* First request does not update userid in sessions table.
* The timeouts may break badly if server hosting forces PHP.ini session settings.
* The session GC is a lot slower, we do not rely on external session timeouts.
* There cannot be any hooks triggered at the session write time.
* File and memcached handlers do not support session lock acquire timeouts.
* Some low level PHP session functions can not be used directly in Moodle code.
This is necessary because MySQL get_recordset_sql() stores the data in memory, unfortunately the alternative resultset iteration blocks concurrent access - that is why we need new method for export.
