SELECT * FROM {Table} WHERE (tag1 = `admin` OR tag2 = `admin` OR
tag3 = `admin`) AND (tag1 = `reporter` OR tag2 = `reporter` OR tag3
= `reporter`)
SELECT * FROM {Table} WHERE `admin` IN (tag1, tag2, tag3) AND
`reporter` IN (tag1, tag2, tag3)
alter table !!
25
Modern Web 2016
SELECT * FROM {Table} INNER JOIN `Tag` AS t1 USING (id) INNER
JOIN `Tag` AS t2 USING (id) WHERE t1.tag = `admin AND t2.tag =
`reporter`
1
tag
26
Modern Web 2016
2
M : N
27
Modern Web 2016 28
Scale Up- Application
Modern Web 2016
N+1 queries / ORM Bad SQL Bad Schema Design Big SQL Big
Transaction Big Batch
99% Application
Modern Web 2016 30
N+1 queries / ORM Bad SQL Bad Schema Design Big SQL Big
Transaction Big Batch
99% Application
Modern Web 2016 31
CHAR MySQL 5.7.7 CHAR VARCHAR
Modern Web 2016
(MySQL) CHAR vs. VARCHAR
32
Primary Index MySQL Index Composite Index
Modern Web 2016
Index
33
Modern Web 2016
Scale Out- Replication- Cluster
Modern Web 2016
Replication
35
Modern Web 2016
Replication
Read Write
36
Modern Web 2016
Clustering
Read/Write
37
Modern Web 2016
Clustering
: Deadlock
38
Modern Web 2016
Clustering
Load Balancer 39
Percona XtraDB Cluster: Multi-node writing and Unexpected
deadlocks2012-08-17
https://www.percona.com/blog/2012/08/17/percona-xtradb-cluster-multi-node-writing-and-unexpected-deadlocks/
Avoiding Deadlocks in Galera - Set up HAProxy for single-node
writes and multi-node reads2013-09-17
http://www.severalnines.com/blog/avoiding-deadlocks-galera-set-haproxy-single-node-writes-and-multi-node-reads
Optimizing Percona XtraDB Cluster for write hotspots2015-06-03
https://www.percona.com/blog/2015/06/03/optimizing-percona-xtradb-cluster-write-hotspots/
