mysql 8.0 architecture and enhancement

●© 2018 Percona1
MySQL 8.0 Architecture and
Enhancements
Lalit Choudhary
Bug Analyst at Percona

●© 2018 Percona●2
Agenda
● MySQL 8.0 Architecture
➢ In-Memory Structure
➢ On-Disk Structure
● MySQL 8.0 Enhancement
➢ Data dictionary
➢ InnoDB
➢ Configuration and Logging
➢ Replication
➢ Security

MySQL 8.0 Architecture
Source

Buffer Pool [In-Memory]
● Caches table and index data as it is
accessed.
● Permits frequently used data to be
processed directly from memory.
● Configuration variable:
Innodb_buffer_pool_size

Buffer Pool [In-Memory]
● Monitoring the Buffer Pool:
○ SHOW ENGINE INNODB STATUS;
○ INFORMATION_SCHEMA.INNODB_BUFFER_POOL_STATS
● Configuration to improve Performance:
○ InnoDB Buffer Pool Size
○ Multiple Buffer Pool Instances
○ InnoDB Buffer Pool Flushing

Change Buffer [In-Memory]
● Caches changes to secondary index
pages.
innodb_change_buffering
innodb_change_buffer_max_size
SHOW ENGINE INNODB STATUSG
INSERT BUFFER AND ADAPTIVE HASH INDEX
1
2
3

Adaptive Hash Index [In-Memory]
● Act like in-memory database on systems.
Innodb_adaptive_hash_index
innodb_adaptive_hash_index_parts
SHOW ENGINE INNODB STATUSG ----> “SEMAPHORES”

Log Buffer [In-Memory]
● Buffer for redo logs.
innodb_log_buffer_size
innodb_flush_log_at_trx_commit

Tablespace [On-Disk]
Example:
innodb_data_file_path =
/data/ibdata1:1G;/data/ibdata2:500M:autoextend
Example:
CREATE TABLESPACE `ts1` ADD DATAFILE 'ts1.ibd'
Engine=InnoDB;
CREATE TABLE t1 (c1 int PRIMARY KEY)
TABLESPACE ts1 Engine=InnoDB;

●© 2018 Percona
●1
0
On-Disk Structure [On-Disk]
server-uuid=b0d8f682-4c09-11e9-b6ac-38dead00d7d2
Binlog: By default Enable in MySQL 8.0
Log Buffer
System tablespace
Default Redo logs
Global Temporary Tablespace
Session Temporary Tablespace
Tablespace for data dictionary tables.
Default Undo Tablespace

●© 2018 Percona●11
Undo Tablespace & Logs [On-Disk]
● Undo tablespaces contain undo logs
● Automated and Manual truncation
● Add/Drop Undo Tablespaces at runtime
[MySQL 8.0.14]
Example:
CREATE UNDO TABLESPACE undo03 ADD DATAFILE
'undo03.ibu';
Innodb_undo_directory
Innodb_undo_log_truncate
Tables:
INFORMATION_SCHEMA.INNODB_TABLESPACES

●© 2018 Percona
●12
Temporary Tablespace [On-Disk]
● Global temporary tablespace
User-created temporary tables
● session temporary
tablespaces
- User-created temporary tables.
- Internal temporary tables created by the
optimizer.
innodb_temp_tablespaces_dir
innodb_temp_data_file_path

●© 2018 Percona
Enhancement [MySQL 8.0]
● Data dictionary
● INNODB Encryption
● Configuration Error Logging
● Replication
● Security
●13

●© 2018 Percona
Data Dictionary [MySQL 8.0]
5.7
Metadata files
.FRM, .PAR, .OPT, .TRN and .TRG files
8.0
Native data dictionary based on InnoDB.
Transactional data dictionary.
SQL
DD Tables
InnoDB
Data dictionary
SQL
Data dictionary
.FRM, .PAR, .OPT, .TRN and .TRG
files
System Tables [mysql.*]
Innodb system tables
MyISAM
InnoDB
File System
●14

●© 2018 Percona
MySQL 8.0 Data-at-rest encryption
● Each individual tablespace has its own encryption key
● Each tablespace key is encrypted by the Global Master Key
● Each time a tablespace is moved a new key is generated. This is called
a transfer key.
Tablespace Key Tablespace KeyTablespace Key Tablespace Key

●© 2018 Percona
InnoDB Encryption [MySQL 8.0]
● File-Per-Table Tablespace [ Introduced in 5.7]
● System Tablespaces (ibdata)
ALTER TABLESPACE mysql ENCRYPTION = 'Y/N';
● General Tablespaces
CREATE/ALTER …. ENCRYPTION = 'Y/N';
●16

●© 2018 Percona
InnoDB Encryption [MySQL 8.0]
● UNDO Tablespaces [ innodb_undo_log_encrypt
● REDO Log [ innodb_redo_log_encrypt conf ]
● Binary Log Files and Relay Log Files [ binlog_encryption]
●17

●© 2018 Percona
Configuration and Logging [MySQL 8.0]
● Persisted System Variables
set persist innodb_redo_log_encrypt=ON
set persist innodb_undo_log_encrypt=ON;
set persist binlog_encryption=ON;
●18

●© 2018 Percona
Logging in MySQL 8.0
● Defaults change: log_error_verbosity=2
● Suppress error logs of type warning or note
Configuration:
[mysqld]
log_error_verbosity=2 # error and warning messages only
log_error_suppression_list='ER_PARSER_TRACE,MY-010001,10002'
●19

●© 2018 Percona
Replication [MySQL 8.0]
● Multi-source Replication Per Channel
Filters
Example:
CHANGE REPLICATION FILTER
REPLICATE_DO_DB=(db1) FOR CHANNEL
channel_1;
● --replicate-do-db=channel_1:db1
● --replicate-ignore-db=channel_1:db2
●20
M1 M2 M3
Slave
Channel_1 Channel_2 Channel_3

●© 2018 Percona
Security [MySQL 8.0]
● SQL Roles : It is a collection of privileges
●21
dba_access
dev_access
app_access
ALL
CREATE, DROP,
SELECT,INSERT,
UPDATE,DELETE
SELECT,INSERT,
UPDATE,DELETE
Users
Roles Privileges+

●© 2018 Percona
● Automatic assignment and granting of default roles when new users are
created [ mandatory_roles]
● Password rotation policy enforcement [default_password_lifetime]
● Old password required for SET PASSWORD for some users
●22

●© 2018 Percona
● Password rotation policy enforcement [default_password_lifetime]
● Old password required for SET PASSWORD for some users
●23

●© 2018 Percona●24
●Patch (not fork) MySQL to
add:
▪Enterprise features for free
(threadpool, PAM auth)
▪Instrumentation
▪Performance/scalability
▪Selected new features
Percona Server: MySQL improved

●© 2018 Percona
References
https://dev.mysql.com/doc/refman/8.0/en/innodb-tablespa
ce-encryption.html
https://dev.mysql.com/doc/refman/8.0/en/roles.html

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