MySQL 8.0.20 - New Features Summary

MySQL 8.0.20
New Features
Summary
Olivier DASINI
MySQL Principal Solutions Architect
Blog: www.dasini.net/blog/en/
Twitter: @freshdaz

www.dasini.net/blog/en/
Me, Myself & I
➢
MySQL Geek
✔ Addicted to MySQL for 15+ years!
✔ Playing with databases for 20+ years
➢
MySQL Writer, Blogger and Speaker
✔ Also former : DBA, Consultant, Architect, Trainer, ...
➢
MySQL Principal Solutions Architect EMEA at Oracle
➢
Stay tuned! :
✔ Twitter : @freshdaz
✔ Blog : www.dasini.net/blog/en
Olivier DASINI

The following is just a summary of the MySQL 8.0.20 new features.
For a more thorough and exhaustive view please read the following :
➢
The MySQL 8.0.20 Maintenance Release is Generally Available
✔ https://mysqlserverteam.com/the-mysql-8-0-20-maintenance-release-is-generally-available/
➢
Changes in MySQL 8.0.20 (2020-04-27, General Availability)
✔ https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-20.html
➢
Changes in MySQL Shell 8.0.20 (2020-04-20, General Availability)
✔ https://dev.mysql.com/doc/relnotes/mysql-shell/8.0/en/news-8-0-20.html
➢
Changes in MySQL Router 8.0.20 (2020-04-27, General Availability)
✔ https://dev.mysql.com/doc/relnotes/mysql-router/en/news-8-0-20.html
➢
Changes in MySQL NDB Cluster 8.0.20 (2020-04-27, General Availability)
✔ https://dev.mysql.com/doc/relnotes/mysql-cluster/8.0/en/news-8-0-20.html
And especially the MySQL team Blogs :
➢
https://mysqlserverteam.com/
➢
https://mysqlhighavailability.com/
➢
https://mysqlrelease.com/
➢
http://insidemysql.com/
Disclaimer

The world's most popular open source database

Highlights
7
Hash Joins
New InnoDB Doublewrite Buffer
Index-Level Optimizer Hints
SHOW_ROUTINE Privilege
MySQL Shell Enhancements
MySQL Router Enhancements
MySQL InnoDB Cluster Enhancements
MySQL Replication Enhancements
MySQL NDB Cluster Enhancements
MySQL Enterprise New Features
Thanks to the Contributors

Hash joins

Hash Joins
➢
MySQL no longer use Block Nested Loop (BNL) as a join strategy
➢
This means that hash joins can now be used for :
✔ Inner equi-joins (since 8.0.18)
✔ Inner non-equi-joins
✔ Semijoins
✔ Antijoins
✔ Left outer joins
✔ Right outer joins
9
Resources
➢
Hash join in MySQL 8
✔ https://mysqlserverteam.com/hash-join-in-mysql-8/
➢
Hash Join Optimization
✔ https://dev.mysql.com/doc/refman/8.0/en/hash-joins.html
➢
WL#13377 - Add support for hash outer, anti and semi join
✔ https://dev.mysql.com/worklog/task/?id=13377

➢
InnoDB area for the doublewrite buffer was moved from the system tablespace to
doublewrite files
✔ These files can be placed on a different storage
➢
This reduces write latency and increases throughput
11
Resources
➢
MySQL Performance : The New InnoDB Double Write Buffer in Action
✔ http://dimitrik.free.fr/blog/posts/mysql-80-perf-new-dblwr.html
➢
Doublewrite Buffer
✔ https://dev.mysql.com/doc/refman/8.0/en/innodb-doublewrite-buffer.html
➢
WL#5655 - Write double write buffer to a separate file to ensure atomic writes

➢
Index hints using the syntax of optimizer hints
✔ Function much like FORCE INDEX & IGNORE INDEX (which will be deprecated)
➢
Index-level optimizer hints :
✔ Can be put right after the SELECT | INSERT | REPLACE | UPDATE | DELETE key words
✔ Must be enclosed into a /*+ */
13
/* Traditional index hint (will be deprecated) */
SELECT title FROM film IGNORE INDEX (idx_title) INNER JOIN film_actor USING (film_id);
/* New Index-Level Optimizer Hint */
SELECT /*+ NO_INDEX(film idx_title) */ title FROM film INNER JOIN film_actor USING (film_id);
Resources
➢
MySQL 8.0.20: Index-Level Optimizer Hints
✔ https://mysql.wisborg.dk/2020/04/28/mysql-8-0-20-index-level-optimizer-hints/
➢
WL#13538 - Add index hints based on new hint infrastructure

➢
New dynamic server privilege which allows to view the stored procedures and
stored functions definitions & properties
➢
This enables an account to back up stored routines without requiring a broad
privilege
➢
It provides access to:
✔ The contents of the INFORMATION_SCHEMA.ROUTINES table
✔ The SHOW CREATE FUNCTION and SHOW CREATE PROCEDURE statements
✔ The SHOW FUNCTION CODE and SHOW PROCEDURE CODE statements
✔ The SHOW FUNCTION STATUS and SHOW PROCEDURE STATUS statements
15
Resources
➢
SHOW_ROUTINE
✔ https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html#priv_show-routine
➢
WL#9049 - Add a dynamic privilege for stored routine backup

➢
New Compression Algorithms
✔ compression-algorithms : allows defining the compression negotiation to be done
when connection is established
✔ Supported values (for classic and X protocols) :
━
zlib
━
zstd
━
uncompressed
━
lz4 but only for X protocol
17
Resources
➢
Compression Control For MySQL Shell 8.0.20 And Later
✔ https://dev.mysql.com/doc/mysql-shell/8.0/en/mysql-shell-compressed-connections-8020.html
➢
MySQL Shell 8.0.20 – What’s New?
✔ https://mysqlserverteam.com/mysql-shell-8-0-20-whats-new/

➢
Authenticate HTTP requests against the MySQL InnoDB Cluster metadata
✔ Allow to :
━
Manage the accounts of the http component via the MySQL Shell
━
Authenticate against accounts stored in the metadata-servers of InnoDB Cluster
━
Using the REST APIs even through communication to the metadata-servers is lost
19
Resources
➢
WL#12952 - Authenticating HTTP Component against MySQL Innodb Cluster metadata
➢
Changes in MySQL Router 8.0.20
✔ https://dev.mysql.com/doc/relnotes/mysql-router/en/news-8-0-20.html

MySQL InnoDB Cluster Enhancements

InnoDB Cluster Enhancements
21
➢
Admin accounts simplification and enhancement
✔ 2 new commands to setup InnoDB Cluster, InnoDB ReplicaSet & Router admin accounts
are now available
━
setupAdminAccount : configure a MySQL user account with the necessary privileges to
administer an InnoDB cluster or InnoDB ReplicaSet
━
setupRouterAccount : create a MySQL user account or upgrade an existing account so that
it that can be used by Router to operate on an InnoDB cluster or InnoDB ReplicaSet
Resources
➢
MySQL Shell AdminAPI – What’s new in 8.0.20?
✔ https://mysqlserverteam.com/mysql-shell-adminapi-whats-new-in-8-0-20/

MySQL Replication Enhancements

Replication Enhancements 1/2
➢
Binary Log Transaction Compression
✔ You can now enable binary log transaction compression
✔ Reduce the amount of I/O, disk usage & network usage
✔ Controlled by 2 variables
━
binlog_transaction_compression: enabling the feature
━
binlog_transaction_compression_level_zstd: specify the compression level
➢
Enforce Primary Key constraints on Replication
✔ Configuration option that controls whether replication channels allow the creation of
tables without primary keys
✔ New option for the CHANGE MASTER TO statement: REQUIRE_TABLE_PRIMARY_KEY_CHECK
25

Replication Enhancements 2/2
26
Resources
➢
Binary Log Transaction Compression
✔ https://dev.mysql.com/doc/refman/8.0/en/binary-log-transaction-compression.html
➢
MySQL Compressed Binary Logs
✔ https://mysql.wisborg.dk/2020/05/07/mysql-compressed-binary-logs/
➢
WL#3549 - Binary log Compression
➢
Enforce Primary Key constraints on Replication
✔ https://mysqlhighavailability.com/enforce-primary-key-constraints-on-replication/
➢
WL#13239 - Enable/disable primary key checks on slaves

MySQL NDB Cluster Enhancements

NDB Cluster Enhancements
28
➢
ndb_restore improvement
✔ Possibility to divide a backup into slices and to restore it in parallel with multiple instances
of ndb_restore
✔ Should help to reduce the length of time required to restore an NDB Cluster from backup
✔ Up to 1024 slices are supported
➢
Performance improvement
✔ Many outer joins and semijoins which previously could not be pushed down to the data
nodes can now pushed
Resources
➢
ndb_restore — Restore an NDB Cluster Backup
✔ https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-restore.html
➢
num-slices
✔ https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-restore.html#option_ndb_restore_num-slices
➢
slice-id
✔ https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-restore.html#option_ndb_restore_slice-id
➢
Engine Condition Pushdown Optimization
✔ https://dev.mysql.com/doc/refman/8.0/en/condition-pushdown-optimization.html

MySQL Enterprise New Features

Enterprise New Features
➢
MySQL Enterprise Backup
✔ Table-Level Recovery: allows selected tables to be restored from full backups
➢
MySQL Enterprise Authentication
✔ SASL LDAP authentication plugin now supports GSSAPI/Kerberos as an
authentication method for MySQL clients and servers on Linux
30
Resources
➢
Table-Level Recovery (TLR)
✔ https://dev.mysql.com/doc/mysql-enterprise-backup/8.0/en/restore.partial.html
➢
LDAP Authentication Methods
✔ https://dev.mysql.com/doc/refman/8.0/en/ldap-pluggable-authentication.html#ldap-pluggable-authentication-auth-methods

Thanks To The Contributors

Thanks To The Contributors
Facebook
Yibo Cai
Jericho Rivera
Matti Sillanpää
32
If you have patches you would like to contribute you can do so from :
➢
MySQL’s GitHub repository : https://github.com/mysql
➢
Requires signing the Oracle Contributor Agreement :
https://www.oracle.com/technetwork/community/oca-486395.html
➢
MySQL 8.0.20: Thanks for the Contributions
✔ https://lefred.be/content/mysql-8-0-20-thanks-for-the-contributions/
Nick Pollett
Bruce Feng
Kamil Holubicky
Rastislav Masaryk (MySQL Router)

The Complete List Of New Features In MySQL 8.0
33
There are 250+ new features in MySQL 8.0...
https://mysqlserverteam.com/the-complete-list-of-new-features-in-mysql-8-0/

Thanks for using !

MySQL 8.0.20 - New Features Summary

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