Mysql 57-upcoming-changes

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Upcoming Changes in MySQL 5.7 
Morgan Tocker, MySQL Community Manager 
http://www.tocker.ca/

Safe Harbor Statement
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Almost 4 Years of MySQL Innovation
MySQL Cluster 7.3

MySQL Migration Wizard

MySQL Workbench 6.0

MySQL 5.6

MySQL 5.5

Windows installer & Tools MySQL 5.7 M y S Q L
Cluster
MySQL
MySQL Enterprise Monitor 2.3 & e r
M a n a g 3.0
Applier for
Hadoop

MySQL Enterprise Backup
Security
MySQL Utilities
MySQL Workbench 5.2 & 6.0
Scalability
MySQL Cluster 7.2
HA
MySQL Enterprise
MySQL Cluster 7.1
O r a c l e C e r t i f i c a t i o n s Audit

MySQL 5.7
• Absolutely amazing things are coming!
• Performance Improvements with InnoDB.
• MDL, Transactions and memory instrumentation
with Performance Schema.
• Many more…
• New features won’t be the focus of this talk.

MySQL 5.7 (cont.)
• Oracle is committed to MySQL’s long term success.
• MySQL 5.7 also cleans up and improves the overall
server architecture.

MySQL 5.7 (cont.)
• Breakage is painful.
• It is important to:
• be as careful as possible
• provide as much notice as possible.
• communicate why change is required.

steer
______ ^
Ways to coerce users in the right
direction
1. Change the default to use desired behaviour.
2. Issue warning about feature deprecation.
3. Remove feature. 
 
Situation dependent. 
MySQL 5.7 employs all 3 techniques.

“Deprecation is a status applied to a
computer software feature, characteristic, or
practice indicating it should be avoided,
typically because it is being superseded.”
http://en.wikipedia.org/wiki/Deprecation

Deprecation
• Will understandably upset users.
• However, it is not the same as removal.
• Good stewardship to define an “officially supported
method” when >1 exist.

The Main Event
• These are the potential changes we have asked for
feedback on. All appear at: 
http://www.tocker.ca/categories/community/
!
• Very important! Being listed here does not
guarantee any change will be made.

Changes to Replication Defaults
• MySQL 5.6 improved durable replication
performance considerably (group commit fix)
• Proposal is to make replication durable by default
starting from 5.7:
• sync_binlog = 1
• master-info-repository = TABLE
• relay-log-info-repository = TABLE

SHOW ENGINE INNODB MUTEX (cont.)
• Overlaps with Performance Schema.
• Proposal in MySQL 5.7:
• To be deprecated.
• We want to be able to ‘pick a favourite’ in order to
keep user experience consistent.

InnoDB Monitor tables
• Existed in a time when information_schema did not.
Usage was:
CREATE TABLE innodb_monitor (a INT) ENGINE=INNODB; 
/* view to the error log */ 
DROP TABLE innodb_monitor;

InnoDB Monitor tables (cont.)
• 5.7 Proposal:
• innodb_monitor. To be replaced with SET GLOBAL
innodb_monitor=ON|OFF.
• innodb_lock_monitor. To be replaced with SET GLOBAL
innodb_lock_monitor=ON|OFF.
• innodb_tablespace_monitor. To be removed.
information_schema will become the recommended
alternative.
• innodb_table_monitor. To be removed. information_schema
will become the recommended alternative.
• innodb_mem_validate. To be removed. This depends on
UNIV_MEM_DEBUG, which is not normally enabled even in
debug builds.

ALTER IGNORE TABLE
• Useful for adding PRIMARY/UNIQUE keys on tables
with duplicate keys.
• Will silently drop rows for you!
• Has strange semantics for replication and ALTER
TABLE.

ALTER IGNORE TABLE (cont.)
• Proposal went ahead already:
• Deprecated in 5.6.17.
• Removed in 5.7 DMR4

Simplify SQL_MODE options
• Proposal is to reduce the number of mode options
available.
• Aim is to increase usage of SQL_MODE options,
encourage more users to run MySQL in a stricter
way.

Simplify SQL_MODE options (cont.)
• Current recommendation: 
sql-mode=“STRICT_TRANS_TABLES,
ERROR_FOR_DIVISION_BY_ZERO,
NO_AUTO_CREATE_USER,
NO_AUTO_VALUE_ON_ZERO,
NO_ENGINE_SUBSTITUTION, NO_ZERO_DATE,
NO_ZERO_IN_DATE,ONLY_FULL_GROUP_BY"

Simplify SQL_MODE options (cont.)
• 5.7 Proposal:
• Remove the options
ERROR_FOR_DIVISION_BY_ZERO,
NO_ZERO_DATE and NO_ZERO_IN_DATE.
• These behaviours be enabled by
STRICT_TRANS_TABLES or
STRICT_ALL_TABLES.
• Improve error reporting when a behaviour is
influenced by an SQL mode.

EXPLAIN PARTITIONS and EXPLAIN
EXTENDED deprecation
• Motivated by Internal Code Cleanup
• Two optional flags that only add value - no reason
other than automated tooling format preferences not
to enable them.

EXPLAIN PARTITIONS and EXPLAIN
EXTENDED deprecation (cont.)
• Proposal:
• Enables two flags by default, and deprecates the use
of the extended syntax.
• Went ahead in 5.7 DMR3.

Query Cache
• Defaults to DISABLED in 5.6.
• We have “ideas but not plans” for future
improvements.

Deprecation of NULL synonym N
mysql> SELECT NULL is N; 
+------------+ 
| NULL is N | 
+------------+ 
|
1 | 
+------------+ 
1 row in set (0.00 sec)
 

 

mysql> INSERT INTO tablea VALUES (3, N); 
Query OK, 1 row affected (0.00 sec)
mysql> SELECT * FROM tablea WHERE b IS N; 
+---+------+ 
| a | b
| 
+---+------+ 
| 3 | NULL | 
+---+------+ 
1 row in set (0.00 sec)

Deprecation of NULL synonym N
(cont.)
• Proposal:
• For removal in either 5.7 or 5.8.
• Still seeking feedback.

Federated Storage Engine
• Users encouraged to use Multi-source replication
over Federated Storage Engine.
• We are seeking feedback for use cases for
Federated.

MyISAM Merge
• Similar to Partitioning but MyISAM Only.
• Does not offer partition pruning.
• Major limitation was partition exchange - introduced
in 5.6.
• Will blog seeking remaining use cases for MERGE
storage engine very soon.

Last Comment
• All of these items have been blogged about here: 
http://www.tocker.ca/categories/community/

Mysql 57-upcoming-changes

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