Changes and Improvements in MariaDB 11.5

MariaDB 11.5 is a current development series.

New Features

Temporary files and tables

• Limit size of created disk temporary files and tables (MDEV-9101)
• There are two system variables used for controlling this feature:
  • max_tmp_space_usage: Limits the the temporary space allowance per user
  • max_total_tmp_space_usage: Limits the temporary space allowance for all users.

Data Types

• The TIMESTAMP range of values was extended. The maximal allowed value for timestamps was '2038-01-19 03:14:07 UTC', and is now '2106-02-07 06:28:15 UTC'. This does not change the storage format, and new tables can be read by old MariaDB servers as long as timestamp values are within the old timestamp range. At the moment this is only supported on 64-bit platforms (MDEV-32188).

Optimizer

• Index condition pushdown is now supported for partitioned tables (MDEV-12404)
• ANALYZE for statement should show selectivity of pushed index condition (MDEV-18478)

Protocol

• Permit bulk implementation to return ALL individual results (MDEV-30366)
• Send initial values of system variables in first OK packet (MDEV-31609)

Observability

• New USERS table in the Information Schema for storing information about users, password expiry, and the limits set by max_password_errors (MDEV-23729, MDEV-32218)
• Add more columns to Information Schema TABLE_STATISTICS, CLIENT_STATISTICS and USER STATISTICS tables (MDEV-33151)
• Add QUERIES column to Information Schema INDEX_STATISTICS table (MDEV-33152)
• Add FLUSH GLOBAL STATUS (MDEV-33145)
• Provide InnoDB async IO statistics (MDEV-32841)
• Show variable deprecation for mariadbd --help output (MDEV-28671)
• Extend Query Response Time plugin to be compatible with Percona server (MDEV-33501)
• New variable, log_slow_always_query_time for additional control over what is logged to the slow query log. (MDEV-33144)

Other

• REPAIR TABLE ... FORCE (MDEV-33449)
• Deprecate and ignore @@alter_algorithm system variable (MDEV-33655)
• Additional features for Sequences (MDEV-28152)
• Change default Unicode collation to uca1400_ai_ci (MDEV-25829)
• Parallel dump of multiple databases via mariadb-dump (MDEV-33625)
• Deprecate spider_casual_read (MDEV-31789)

Variables

• For a list of all new variables, see System Variables Added in MariaDB 11.5 and Status Variables Added in MariaDB 11.5.

List of All MariaDB 11.5 Releases