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MySQL Ecosystem in 2018
1.
© 2018 Percona1 Laurynas
Biveinis MySQL Ecosystem in 2018 What’s new & exciting around “World’s most popular open source database” Percona Server for MySQL tech lead Big Data Conference Vilnius 2018 2018-11-28
2.
© 2018 Percona2 Hi,
I’m Laurynas Database C++ engineer at Percona & Percona Server for MySQL tech lead ▪Been doing this since 2011 ▪Before that tried to do PhD in databases, failed Percona: “Unbiased Open Source Database Experts” ▪Find and use the right tool for the job (even if it’s not Percona Server for MySQL, to my great disappointment) ▪Hence, in a good position to evaluate technologies
3.
© 2018 Percona3 MySQL:
has been around since 1995 • Past the peak public hype • Runs some of the world’s largest OLTP databases • Colorful yet healthy history of forks, acquisitions, politics • Development is gaining momentum
4.
© 2018 Percona4 MySQL:
popular in 2018 https://db-engines.com/en/ranking
5.
© 2018 Percona5 MySQL:
popular in 2018 Stack Overflow Popularity MySQL SQL Server PostgreSQL MongoDB SQLite 0 15 30 45 60 19,7 25,9 32,9 41,2 58,7 26,6 21 26,5 38,6 55,6 2017 2018 Source: https://insights.stackoverflow.com/survey/2018/ Source: https://insights.stackoverflow.com/survey/2017
6.
© 2018 Percona6 2018:
MySQL 8.0 release ▪ Following MySQL 5.7 release in 2015 (the 1st one w/ doc store features) ▪ New data dictionary ▪ NOWAIT / SKIP LOCKED ▪ Instant ADD COLUMN ▪ partial in-place JSON updates, including replication ▪ JSON_TABLE ▪ Common table expressions ▪ Window functions ▪ SET PERSIST ▪ … too much to list here, go to http://bit.ly/2TOKAQm
7.
© 2018 Percona7 MySQL
8.0: new data dictionary ▪Remember FRM files? They are gone! ▪Replaced by a transactional data dictionary: a set of internal InnoDB tables ▪Finally crash-safe, atomic DDL statements ▪No more metadata files means fewer file system bottlenecks ▪One billion tables possible: http://bit.ly/2DCXfjI ▪Fast INFORMATION_SCHEMA queries ▪However, if something goes wrong, your ls-cd shell skills will get you nowhere • ibd2sdi - human readable metadata
8.
© 2018 Percona8 ▪http://bit.ly/2R98hkz ▪No
longer filesystem scans ▪Views over InnoDB tables in DD MySQL 8.0 fast INFORMATION_SCHEMA queries
9.
© 2018 Percona9 MySQL
8.0 hot row handling: NOWAIT & SKIP LOCKED ▪Implemented in AliSQL (Alibaba patch) and Facebook patch ▪Now in MySQL & MariaDB ▪Return error immediately instead of row lock wait timeout: • SELECT … FOR UPDATE NOWAIT ▪Non-deterministically skip locked rows: • SELECT … FOR UPDATE SKIP LOCKED ▪Example use cases: online shopping inventory availability, cinema seat picker
10.
© 2018 Percona10 MySQL
8.0 instant add column ALTER TABLE t1 ADD COLUMN d INT DEFAULT 1000, ALGORITHM=INSTANT; Query OK, 0 rows affected (0.07 sec)
11.
© 2018 Percona11 MySQL
8.0 partial JSON update ▪JSON_REPLACE on 1K doc, 10 byte update: ▪in 5.7: DELETE + INSERT ▪… replication of JSON_REPLACE in ROW: DELETE + INSERT! ▪In 8.0: JSON_REPLACE (JSON_SET, JSON_REMOVE) will do the delta in-place ▪If binlog_row_value_options=PARTIAL_JSON, delta will be replicated in ROW too
12.
© 2018 Percona12 MySQL
8.0: JSON_TABLE ▪Convert JSON to a relational table, by providing column name, type & path: ▪SELECT * FROM JSON_TABLE( ‘[{“x”:1, “y”:”6”}, {“x”:”2”, “y”:”5”}, {“x”:”3”, “y”:4}]’, “$[*]” COLUMNS (x INT PATH “$.x”, y INT PATH “$.y”)) AS j; +-------+ | x | y | +---+---+ | 1 | 6 | | 2 | 5 | | 3 | 4 | +---+---+
13.
© 2018 Percona13 MySQL
8.0: Common Table Expressions WITH RECURSIVE cte (n) AS ( SELECT 1 UNION ALL SELECT n + 1 FROM cte WHERE n < 5 ) SELECT * FROM cte; +------+ | n | +------+ | 1 | | 2 | | 3 | | 4 | | 5 | +------+
14.
© 2018 Percona14 MySQL
8.0: Common Table Expressions WITH RECURSIVE fibonacci (n, fib_n, next_fib_n) AS ( SELECT 1, 0, 1 UNION ALL SELECT n + 1, next_fib_n, fib_n + next_fib_n FROM fibonacci WHERE n < 10 ) SELECT * FROM fibonacci; +------+-------+------------+ | n | fib_n | next_fib_n | +------+-------+------------+ | 1 | 0 | 1 | | 2 | 1 | 1 | | 3 | 1 | 2 | | 4 | 2 | 3 | | 5 | 3 | 5 | | 6 | 5 | 8 | | 7 | 8 | 13 | | 8 | 13 | 21 | | 9 | 21 | 34 | | 10 | 34 | 55 | +------+-------+------------+
15.
© 2018 Percona15 MySQL
8.0: Window Functions SELECT MONTH(date), SUM(sale), AVG(SUM(sale)) OVER (ORDER BY MONTH(date) RANGE BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS sliding_avg FROM sales GROUP BY MONTH(date);
16.
© 2018 Percona16 MySQL
8.0: SET PERSIST ▪In earlier versions, applying a config change: • SET GLOBAL variable = new_value; • $ vi my.cnf # I hope this is the right file and I didn’t make a typo • … learn what broke on the next restart … ▪In 8.0 • SET PERSIST variable = new_value ▪For a RO variable, to take effect on the next restart: • SET PERSIST_ONLY variable = new_value • RESTART (also a new SQL command in 8.0) ▪No shell required
17.
© 2018 Percona17 ▪Concerns
about Oracle ownership of MySQL • which have not materialized ▪By now, a database on its own, no longer “a flavor of MySQL” ▪Different (and diverging) feature set ▪Not necessarily MySQL- compatible in replication setup MariaDB: the main MySQL-like alternative
18.
© 2018 Percona18 2018:
MariaDB 10.3 is GA ▪System-versioned tables ▪Oracle PL/SQL compatibility ▪Instant ADD COLUMN ▪SEQUENCEs ▪… lots more, http://bit.ly/2E1zdzN
19.
© 2018 Percona19 MariaDB
10.3: system-versioned tables ▪CREATE TABLE … WITH SYSTEM VERSIONING ▪INSERT a row, then UPDATE, UPDATE, UPDATE it, and then: ▪SELECT *, ROW_START, ROW_END FROM table FOR SYSTEM_TIME ALL; • a b ROW_START ROW_END • 1 0 2018-11-28 10:48:04.435534 2018-11-28 10:48:04.437197 • 1 1 2018-11-28 10:48:04.437197 2018-11-28 10:48:04.437505 • 1 2 2018-11-28 10:48:04.437505 2038-01-19 05:14:07.999999 ▪SELECT * FROM table FOR SYSTEM_TIME AS OF TIMESTAMP ‘2018-10-01 00:00:00’ ▪Transactionally-consistent and inconsistent ▪Space management provided too: PARTITION p HISTORY / DELETE HISTORY
20.
© 2018 Percona20 MariaDB
10.3: Oracle PL/SQL ▪—sql-mode=oracle ▪Changes stored procedure / stored function / cursor / LOOP / variable syntax, some function behavior, etc etc ▪Adds PACKAGE support ▪Empty string '' and NULL become identical ▪Etc ▪Might make migration easier?
21.
© 2018 Percona21 MariaDB
10.3: SEQUENCE ▪CREATE SEQUENCE seq START WITH 1 INCREMENT BY 1; ▪INSERT INTO TABLE (id, …) VALUES (NEXT VALUE FOR seq, …) ▪At column definition: • NOT NULL DEFAULT NEXT VALUE FOR seq • AUTO_INCREMENT-like but more flexible ▪SELECT PREVIOUS VALUE for seq;
22.
© 2018 Percona22 Patch
(not fork) MySQL to add: ▪Enterprise features for free (threadpool, PAM auth) ▪Instrumentation ▪Performance/scalability ▪Selected new features ▪http://bit.ly/2DOg4Au Percona Server: MySQL improved
23.
© 2018 Percona23 Percona
Server in 2018 ▪Coming at the very end of 2018: Percona Server 8.0 GA, now at RC ▪Data at Rest Encryption ▪MyRocks: a new write- and space- optimized storage engine as GA
24.
© 2018 Percona24 Percona
Server: Data at Rest Encryption ▪MySQL 5.7: encryption of InnoDB tables, keys stored in a plaintext file ▪MySQL 8.0: adds redo- & undo- log encryption ▪MariaDB: also binlog encryption, various temp files, automatic key rotation, key storage in AWS ▪Percona Server 5.7: similar to MariaDB but compatible with MySQL & key storage in Vault (not AWS) ▪Both MariaDB and Percona Server can reasonably achieve everything-is-encrypted state ▪http://bit.ly/2zuRtxP
25.
© 2018 Percona25 Percona
Server: MyRocks ▪MyRocks: Facebook-made MySQL storage engine on the top of RocksDB ▪RocksDB: Facebook-made key-value store library • Fork of Google LevelDB ▪InnoDB: B-tree • Optimized for reads ▪RocksDB: LSM-tree • Optimized for writes and disk space while reads stay OK-ish ▪You probably don’t want to run MySQL Facebook Patch directly yourself (even if you can) ▪Percona (and MariaDB) integrated MyRocks for the general community
26.
© 2018 Percona26 What’s
the deal with all those forks? http://bit.ly/2Qq9czS
27.
© 2018 Percona27 MySQL
in 2018: clusters ▪The built-in asynchronous replication does not make a cluster • HA? Multi-master? ▪Existing (and actively- developed) clusters: Percona XtraDB Cluster & MariaDB • Based on galera library + Write Set replication patch ▪New player: Group Replication WSREP Galera WSREP Galera WSREP Galera App Reads Reads Reads/Writes
28.
© 2018 Percona28 Group
Replication ▪Oracle MySQL shared-everything cluster (not to be confused with shared-nothing MySQL Cluster) ▪Went GA in 5.7 at the end of 2016 • With number of issues that we couldn’t agree with the GA qualification ▪However, Oracle has been hard at work to fix them ▪Lots of progress in 8.0 ▪Still, elephant in the room: no automated node provisioning ▪If not GA, then getting there quickly
29.
© 2018 Percona29 What
sits in the front of the cluster? ▪Proxy does! If nothing else, to shield you from the “who is the primary now?” question ▪“Best” option in 2018: • ProxySQL, 2.0 coming soon ▪Other options: • MySQL Router • MariaDB MaxScale (mind the BS licence) WSREP Galera WSREP Galera WSREP Galera ProxySQL Reads Reads Reads/Writes App App Reads/Writes Reads/Writes
30.
© 2018 Percona30 (A
side note on MySQL vision here) ▪InnoDB Cluster • (not to be confused with MySQL Cluster, XtraDB Cluster, … Cluster) ▪Group Replication ▪MySQL Router ▪MySQL Shell MySQL Router Reads Reads Reads/Writes App App Reads/Writes Reads/Writes GR GR GR MySQL Shell Admin Admin
31.
© 2018 Percona31 MySQL
in 2018: last but not least ▪Physical backups: • Percona XtraBackup is the leader, being updated for 8.0 • mariabackup if using MariaDB incompatible features such as encryption ▪Percona Toolkit, MySQL Utilities ▪MariaDB ColumnStore, mydumper, MHA, vitess, PRM on Pacemaker, MySQL Sandbox, DBaaS, Aurora, … ▪Trying to dockerize MySQL ▪And then everyone is trying to figure out how to use Kubernetes ▪…
32.
© 2018 Percona32 MySQL
in 2018: Thank you! ▪join at slido.com with #bigdata2018 for questions!
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