Sunday, October 16, 16khankennels.com/presentations/pdf/Zend2016_DBA_tutorial.pdf ·...

Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |

Sunday, October 16, 16


A MySQL DBA PrimerLigaya Turmelle

Principal Technical Support Engineer -‐ MySQL

[email protected]

@lig

, Oracle and/or its affiliates. All rights reserved. | 2Sunday, October 16, 16


Safe Harbor Statement

The following is intended to outline our general product direc@on. It is intended for informa@on purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or func@onality, and should not be relied upon in making purchasing decisions. The development, release, and @ming of any features or func@onality described for Oracle’s products remains at the sole discre@on of Oracle.

3Sunday, October 16, 16


Agenda -‐ First Half

• Founda@on

• Installa@on

• Talking to MySQL

• Architecture

• Log Files

1

2

3

4

5



Agenda -‐ Second Half

• Log Files (con’t)

• Security

• Backup

• Monitoring

• Basic Troubleshoo@ng

5

6

7

8

9



FoundaNon



FoundaNon

• Basics

• Commercial

1

2



MySQL in a Nutshell

• Worlds most popular open source database

• “M” of LAMP

• Main site: mysql.com



MySQL.com

• mysql.com- Commercial site



MySQL.com


• dev.mysql.com (AKA mysql.org)- Developer Zone


http://dev.mysql.com



MySQL.com



• downloads.mysql.com




http://downloads.mysql.com



MySQL.com



• downloads.mysql.com• dev.mysql.com/doc/

- Documentation






http://dev.mysql.com/doc/



MySQL.com



• downloads.mysql.com• dev.mysql.com/doc/

- Documentation

• bugs.mysql.com









GeQng Help

• Manual



GeQng Help

• Manual

• MySQL Support



GeQng Help

• Manual

• MySQL Support

• MySQL Forums (forums.mysql.com)



GeQng Help

• Manual

• MySQL Support


• Mailing Lists (lists.mysql.com)



GeQng Help

• Manual

• MySQL Support



• Search the Web



GeQng Help

• Manual

• MySQL Support



• Search the Web

• IRC on freenode -‐ #mysql



Main Features

• Works on mul@ple pla^orms

• Mul@-‐layered server design

• Pluggable architecture-‐ Storage engine

-‐ Misc plugins (Ex: validate_password, SHA256_password)

• Mul@-‐threaded

• “Plays well” with most programming languages



FoundaNon

• Basics

• Commercial22

1



Enterprise EdiNon Add-‐Ons

• MySQL Enterprise Backup (MEB)

• MySQL Enterprise Monitor (MEM)

• Workbench

• Plugins• Threadpool, Audit, Firewall, TDE, Encryp@on, PAM, etc

• Oracle Enterprise Manager for MySQL



InstallaNon



InstallaNon

• Files

• Installa@on

1

2



OpNon Files

• AKA configura@on files• Lists specific startup op@ons

# The following options will be passed to all MySQL clients

[client]#password! = your_passwordport! ! = 3626socket!! = /tmp/mysql.5.6.26.sock

# Here follows entries for some specific programs

# The MySQL server[mysqld]port! = 3626socket!= /tmp/mysql.5.6.26.socklog-error = /Users/ligaya/mysql_installs/

mysql-5.6.26-osx10.9-x86_64/data/error.logserver-id! = 1table_open_cache = 4000



Common LocaNons of OpNon File

• Windows-INSTALLDIR\my.ini

-INSTALLDIR\my.cnf

• Linux & Mac-/etc/my.cnf

-/etc/mysql/my.cnf



Generic Unix/Linux Binary File Layout

Directory Contents

bin, scripts Client programs, mysqld server and u@lity programs

data Log files and databases

docs Manual in Info format

man Unix manual pages

include Include (header) files

lib Libraries

shareMisc support files including error messages, sample op@on files and SQL for database installa@on



Linux RPM File Layout

Directory Contents

/usr/bin Client programs and scripts

/usr/sbin mysqld server

/var/lib/mysql log files and databases

/usr/share/info Manual in Info format

/usr/share/man Unix manual pages

/usr/include/mysql Include (header) files

/usr/lib/mysql Libraries

/usr/share/mysqlMisc support files including error messages, character set files, sample op@on files and SQL for database installa@on



Windows File Layout

Directory Contents Notes

bin, scripts Client programs, mysqld server and u@li@es scripts

%ALLUSERSPROFILE%\MySQL\MySQL Server 5.7\

Log files and databases (Windows XP, Windows Server 2003)

The Windows system variable %ALLUSERSPROFILE% defaults to C:\Documents and Settings\All Users\Application Data

%PROGRAMDATA%\MySQL\MySQL Server 5.7\

Log files and databases (Vista, Windows 7, Windows Server 2008 and newer)

The Windows system variable %PROGRAMDATA% defaults to C:\ProgramData

examples Example programs and scripts

include include (header) files

lib Libraries

shareMisc support files including error messages, character set files, sample op@on files and SQL for database installa@on



InstallaNon

• Files

• Installa@on22

1



InstallaNon

• Well documented in the Manual

• Each OS is documented -‐ some with mul@ple ways to do it-‐ Unix/Linux Generic Binaries

-‐ Windows

-‐ Mac

-‐ Various Linux (MySQL Repositories, RPM, Na@ve Repositories)

-‐ Solaris

-‐ Source



Generic Binary InstallaNonshell> groupadd mysqlshell> useradd -r -g mysql mysqlshell> cd /usr/localshell> tar zxvf /path/to/mysql-VERSION-OS.tar.gzshell> ln -s full-path-to-mysql-VERSION-OS mysqlshell> cd mysqlshell> mkdir mysql-filesshell> chmod 770 mysql-filesshell> chown -R mysql .shell> chgrp -R mysql .shell> bin/mysql_install_db --user=mysql # Before 5.7.6shell> bin/mysqld --initialize --user=mysql # 5.7.6 and upshell> bin/mysql_ssl_rsa_setup # 5.7.6 and upshell> chown -R root .shell> chown -R mysql data mysql-filesshell> bin/mysqld_safe --user=mysql & # optionally start the server# Next command is optionalshell> cp support-files/mysql.server /etc/init.d/mysql.server



StarNng it up

• Various methods-mysqld_safe

-mysqld

-mysql.server

-service mysqld start

-‐ Windows Service

• Unix/Linux -‐ run as a non-‐root account• Windows -‐ admin rights



ShuQng it down

• Manually-mysqladmin shutdown

-/etc/init.d/mysql stop

-service mysqld stop

-NET STOP MySQL

- Services Manager

-SHUTDOWN (5.7)



Talking to MySQL



CLI -‐ mysql client

• Easy to use• Simple SQL shell

• Server side help• Many op@ons-‐ Example: --i-am-a-dummy

• Has its own commands

mysql> select count(*) from inventory;+----------+| count(*) |+----------+| 4581 |+----------+1 row in set (0.08 sec)

mysql> ALTER TABLE rental DROP FOREIGN KEY `fk_rental_inventory`;

Query OK, 0 rows affected (0.25 sec)Records: 0 Duplicates: 0 Warnings: 0

mysql> SELECT rental_id from rental order by RAND() LIMIT 10;

+-----------+| rental_id |+-----------+| 12539 || 8592 || 15699 |



Workbench

• GUI-‐ SQL Development

-‐ Data Modeling

-‐ Server Administra@on

-‐ Data Migra@on

-‐ Performance Tools and Reports

-‐ Integrated with MEB and Audit

-‐ MySQL U@li@es



Main Screen in Linux



SQL Editor in Windows



Data Modeling in Mac



Performance Dashboard in Linux



Architecture



Architecture

• High Level

• Storage Engines

1

2



High Level



Architecture

• High Level

• Storage Engines22

1



InnoDB

• General-‐purpose storage engine• As of 5.5, is the default engine• Features:-‐ ACID compliant

-‐ Row level locking with consistent reads

-‐ Foreign keys

-‐ Clustered primary key index

-‐ FullText Indexes (5.6) & Geospa@al data and indexes (5.7)



InnoDB (con’t)

• Features Con@nued:-‐ Tablespaces

• file per table

-‐ transportable

-‐ encrypted

• undo logs

• general

-‐ Compressed Data



MyISAM

• Default storage engine prior to 5.5• Stored on disk as 3 files• Features-‐ FullText indexes

-‐ Geospa@al datatypes support

• Legacy -‐ Not recommended with new systems



Others

• Memory

• CSV• Archive• Blackhole• 3rd Party



Log Files



Error Log

• --log-error[=file_name]• Default loca@on: host_name.err in datadir• Examples of stuff logged-‐ Start and stops & Cri@cal errors

-‐ MyISAM tables that need to be checked or repaired

-‐ some OS’s -‐ stack trace if mysqld crashes

• (5.7) log_syslog to send MySQL error log to syslog

• (5.7) log_error_verbosity51



Slow Query Log

• First line of offense for tuning queries• Why?-‐ Performance usually

• Enable dynamically or with --slow-query-log-‐ Default file loca@on: host_name-slow.log in the datadir

-‐ Can also go to a table

• Mul@ple op@ons for controlling it

• Aggregate its data with mysqldumpslow u@lity52



mysqldumpslow

• Parses slow query log and aggregates the data• Default -‐ groups queries that are similar-‐ “abstracts” out specific string and number data values

• Op@ons for sor@ng:-‐ t, at -‐ sort by query @me or average query @me

-‐ l, al -‐ sort by lock @me or average lock @me

-‐ r, ar -‐ sort by rows or average rows sent

-‐ c -‐ sort by count



Example mysqldumpslow outputCount: 6 Time=0.36s (2s) Lock=0.00s (0s) Rows=1.0 (6), agent[agent]@localhost SELECT @@version NOT LIKE "S" AND (SELECT COUNT(*) < N FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA != 'S') AND (SELECT COUNT(*) = N FROM INFORMATION_SCHEMA.TABLES WHERE CREATE_OPTIONS LIKE 'S')

Count: 2 Time=0.24s (0s) Lock=0.10s (0s) Rows=1.0 (2), agent[agent]@localhost SELECT ROUND(SUM(sum_timer_wait)/N) total_wait_time_ms, SUM(count_star) total_statements, ROUND(MAX(max_timer_wait)/N) max_wait_time_ms, SUM(sum_errors) total_errors, SUM(sum_warnings) total_warnings, SUM(sum_rows_sent) total_rows_returned, ROUND(SUM(sum_lock_time)/N) total_lock_time_ms FROM performance_schema.events_statements_summary_by_digest

Count: 100 Time=0.22s (22s) Lock=0.00s (0s) Rows=0.0 (0), root[root]@localhost CREATE TABLE `t1` (id serial,id0 varchar(N) unique key,intcol1 INT(N) ,intcol2 INT(N) ,intcol3 INT(N) ,intcol4 INT(N) ,intcol5 INT(N) ,charcol1 VARCHAR(N),charcol2 VARCHAR(N),charcol3 VARCHAR(N),charcol4 VARCHAR(N),charcol5 VARCHAR(N),charcol6 VARCHAR(N),charcol7 VARCHAR(N),charcol8 VARCHAR(N),charcol9 VARCHAR(N),charcol10 VARCHAR(N))

Count: 300 Time=0.20s (60s) Lock=0.00s (0s) Rows=0.0 (0), root[root]@localhost CREATE TABLE `t1` (id serial,id0 varchar(N) unique key,intcol1 INT(N) ,intcol2 INT(N) ,intcol3 INT(N) ,intcol4 INT(N) ,intcol5 INT(N) ,intcol6 INT(N) ,intcol7 INT(N) ,intcol8 INT(N) ,intcol9 INT(N) ,intcol10 INT(N) ,charcol1 VARCHAR(N),charcol2 VARCHAR(N),charcol3 VARCHAR(N),charcol4 VARCHAR(N),charcol5 VARCHAR(N),charcol6 VARCHAR(N),charcol7 VARCHAR(N),charcol8 VARCHAR(N),charcol9 VARCHAR(N),charcol10 VARCHAR(N))



EXPLAIN

• Displays query execu@on plan• Syntax:-‐ Prior to 5.6:

• EXPLAIN [explain_type] SELECT select_options

-‐ 5.6:• EXPLAIN [explain_type] explainable_stmt



EXPLAIN

• Talk all by itself• 1 row == 1 table• Order mapers

• EXTENDED + SHOW WARNINGS = rewripen query• Columns:-‐ id, select_type, table, par@@ons, type, possible_keys, key, key_length, ref, rows, filtered, Extra

(con’t)



Example CLI EXPLAIN

mysql> EXPLAIN EXTENDED SELECT ci.Name, -> co.Name, -> cl.IsOfficial -> FROM City ci -> INNER JOIN Country co -> ON ci.CountryCode = co.Code -> INNER JOIN CountryLanguage cl -> ON co.Code = cl.CountryCode -> WHERE cl.Language = 'ENGLISH' -> LIMIT 100;+----+-------------+-------+------------+--------+---------------------+-------------+---------+----------------------+------+----------+-------------+| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |+----+-------------+-------+------------+--------+---------------------+-------------+---------+----------------------+------+----------+-------------+| 1 | SIMPLE | cl | NULL | ALL | PRIMARY,CountryCode | NULL | NULL | NULL | 984 | 10.00 | Using where || 1 | SIMPLE | co | NULL | eq_ref | PRIMARY | PRIMARY | 3 | world.cl.CountryCode | 1 | 100.00 | NULL || 1 | SIMPLE | ci | NULL | ref | CountryCode | CountryCode | 3 | world.cl.CountryCode | 1 | 100.00 | NULL |+----+-------------+-------+------------+--------+---------------------+-------------+---------+----------------------+------+----------+-------------+3 rows in set, 2 warnings (0.00 sec)



Workbench Visual EXPLAIN -‐ Mac



General Query Log

• General Record• Why:-‐ Order is important

-‐ Exact query that came in

-‐ minimal audit of what a connec@on did

• Enable Dynamically or with --general-log-‐ Default loca@on: host-name.log in datadir

• Mul@ple op@ons for controlling it



Binary Log

• Logs database *change* events• Why?-‐ Replica@on or Data Recovery

• Enable with --log-bin• A LOT of op@ons• “Read” with mysqlbinlog• To disable binary logging for the current session, use sql_log_bin



mysqlbinlog

• Display binary/relay logs in text format

• Syntax: mysqlbinlog [options] logfile• Can work with any replica@on format-‐ Reading Row Based Replica@on

• --verbose --base64-output=DECODE-ROWS

• Can backup binary logs to remote server-‐ Sta@c or streaming

• --read-from-remote-server



Example mysqlbinlog output# at 316#130512 20:22:57 server id 1 end_log_pos 364 CRC32 0xa7a9fe8c !GTID [commit=yes]SET @@SESSION.GTID_NEXT= '6e521de8-bb62-11e2-836e-821afda5425c:2'/*!*/;# at 364#130512 20:22:57 server id 1 end_log_pos 443 CRC32 0xf9bf1aaa !Query! thread_id=3! exec_time=0!error_code=0SET TIMESTAMP=1368404577/*!*/;BEGIN/*!*/;# at 443#130512 20:22:57 server id 1 end_log_pos 542 CRC32 0x1b82a82c !Query! thread_id=3! exec_time=0!error_code=0SET TIMESTAMP=1368404577/*!*/;insert into t1 values (1)/*!*/;# at 542#130512 20:22:57 server id 1 end_log_pos 573 CRC32 0x22965d3b !Xid = 29COMMIT/*!*/;# at 573#130512 20:23:01 server id 1 end_log_pos 621 CRC32 0x89e5d253 !GTID [commit=yes]SET @@SESSION.GTID_NEXT= '6e521de8-bb62-11e2-836e-821afda5425c:3'/*!*/;



Security



Securing a New InstallaNon Prior to 5.7

• Ini@al user accounts-‐ Superuser (root)

-‐ Anonymous (“”)



User Account

• 2 parts-‐ username

-‐ hostname

-‐ Ex:• ‘root’@‘localhost’

• ‘’@‘127.0.0.1’

• ‘root’@‘192.168.1.%’

• ‘lig’@’%’




• Ini@al accounts-‐ Superuser (root)


• test database

(con’t)






• test database• Securing the easy way-mysql_secure_installation

(con’t)






• test database• Securing the easy way-mysql_secure_installation

• Hard way

(con’t)



Securing a New InstallaNon in 5.7

71

• Done during data directory installa@on• mysqld --initialize -‐ Secure by default

• Generate random password for `root`@`localhost` account and writes message with it

• Password marked as expired

• mysqld --initialize-insecure-‐ Empty password for `root`@`localhost` account

-‐ Does *NOT* mark password as expired



Securing a New InstallaNon in 5.7

72

• Assigning a new `root`@localhost` password

(con’t)

mysql> ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘new-password’;



Access Control

• 2 stages



Access Control

• 2 stages-‐ Stage 1: Connec@ng

• Who are you?

-‐ host

-‐ username



User Accounts

• CREATE USER

• ALTER USER (5.6)

75

mysql> CREATE USER ‘lig’@‘localhost’ IDENTIFIED BY ‘S3cr3t’;

mysql> ALTER USER ‘lig’@‘localhost’ IDENTIFIED BY ‘new-password’;



Access Control


• Who are you?

-‐ host

-‐ username

• Prove it!



Passwords

• Expira@on-‐ Manually (5.6) or with a Policy (5.7)

• Hashing-‐ Mul@ple authen@ca@on plugins available

• Policy-‐ Use Password Valida@on plugin (validate_password)

• cleartext supplied password checked against password policy

• 3 levels of password checking which can be modified



Access Control


• Who are you?

-‐ host

-‐ username

• Prove it!

-‐ Stage 2: Request• For each request

-‐ What are you doing and are you allowed to do that?



GRANT

• Defines privileges and account characteris@cs• Mul@ple privileges-‐ Ex: SUPER, CREATE, ALTER, SELECT, INSERT

• Mul@ple levels-‐ Ex: Global, Database, Table, Column

• Account characteris@cs-‐ Ex: REQUIRE SSL or MAX_QUERIES_PER_HOUR



Sample GRANTSmysql> SHOW GRANTS;+---------------------------------------------------------------------+| Grants for root@localhost |+---------------------------------------------------------------------+| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION || GRANT ALL PRIVILEGES ON `mysql`.* TO 'root'@'localhost' || GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |+---------------------------------------------------------------------+3 rows in set (0.00 sec)

mysql> SHOW GRANTS FOR 'test'@'localhost';+--------------------------------------------------------+| Grants for test@localhost |+--------------------------------------------------------+| GRANT USAGE ON *.* TO 'test'@'localhost' || GRANT ALL PRIVILEGES ON `test`.* TO 'test'@'localhost' |+--------------------------------------------------------+2 rows in set (0.00 sec)



REVOKE

• Removes the privileges GRANTed-‐ Does not extrapolate

• Does not remove the user

• If no host is given-‐ % is used

-‐ Again -‐ Does not extrapolate



REVOKEmysql> SHOW GRANTS FOR 'test'@'localhost';+--------------------------------------------------------+| Grants for test@localhost |+--------------------------------------------------------+| GRANT USAGE ON *.* TO 'test'@'localhost' || GRANT ALL PRIVILEGES ON `test`.* TO 'test'@'localhost' |+--------------------------------------------------------+2 rows in set (0.00 sec)

mysql> REVOKE DELETE ON test.t1 FROM 'test'@'localhost';ERROR 1147 (42000): There is no such grant defined for user 'test' on host 'localhost' on table 't1'

mysql> REVOKE USAGE ON *.* FROM 'test'@'localhost';Query OK, 0 rows affected (0.02 sec)



Backups



Backups Types

• Logical

• Physical

1

2



Logical Backups

• Saved-‐ Logical structure

-‐ Content

• Machine Independent

• Slower• Server Up/Warm

• Full Granularity



mysqldump

• Logical• Commonly used

• Editable text files• Very flexible• Ques@onable scalability



mysqlpump

• Logical• Similar to mysqldump

• Parallel processing to speed up dump process

• Dump user accounts with CREATE USER/GRANT

• Default: I_S, P_S, ndbinfo and SYS not included• Reloading: faster secondary index crea@on for InnoDB



SELECT ... INTO OUTFILE and LOAD DATA INFILE

• Logical• Data only• Be careful! You want a consistent backup• Column and line terminators can be specified

• Lots of details -‐ see the manual



Backup Types

• Logical

• Physical22

1



Physical Backup

• Raw copies• Faster then logical (orders of magnitude)

• Compact

• File based granularity• Usually server is down or locked



Filesystem Snapshot

• Physical• OS Dependent• Basic Steps-FLUSH TABLES WITH READ LOCK

-‐ Take the snapshot

-UNLOCK TABLES

-‐ Copy files from snapshot



MySQL Enterprise Backup

• Official physical backup solu@on-‐ MySQL 5.0 to 5.7

-‐ Can handle all official MySQL supported storage engines

• Mul@-‐pla^orm

• Binlog and Relay log backup• Fast Recovery



3rd Party Backup

• Xtra Backup-‐ Percona backup solu@on

-‐ Open source

-‐ Backs up• InnoDB, XtraDB and MyISAM

• MySQL 5.1, 5.5 and 5.6



Don’t Forget Your Binary Logs

• Incremental backup-‐ Holds changes since the full backup -‐ roll it forward

•Physical file copy-‐ Rotate binary log with FLUSH LOGS

-‐ Copy the file

• Logical copy to remote server-‐ Sta@c or streaming

• mysqlbinlog --read-from-remote-server



Monitoring



SHOW

• MySQL specific command

• Commands for

-‐ Metadata

-‐ Status informa@on

• Metric crap-‐ton



Examples

Metadata

SHOW DATABASES SHOW TRIGGERS SHOW PLUGINS

SHOW CREATE PROCEDURE SHOW ENGINES SHOW VARIABLES

SHOW INDEXES SHOW GRANTS SHOW BINARY LOGS

Status

SHOW SLAVE STATUS SHOW OPEN TABLES SHOW RELAYLOG EVENTS

SHOW ENGINE INNODB STATUS

SHOW FULL PROCESSLIST SHOW GLOBAL STATUS



INFORMATION_SCHEMA

• Mostly metadata-PROCESSLIST

-GLOBAL_VARIABLES / GLOBAL_STATUS

-FILES / INNODB_SYS_TABLESPACES / INNODB_SYS_DATAFILES

• But-INNODB_TRX / INNODB_LOCKS / INNODB_LOCK_WAITS

-INNODB_TEMP_TABLE_INFO



SYS SCHEMA

• Included in 5.7.7-‐ Installed by default with --initialize

•Originally known as ps_helper-‐ Originally created by Mark Leith

-‐ hpp://www.markleith.co.uk/ps_helper

-‐ Can work with 5.6 -‐ download from Github• hpps://github.com/mysql/mysql-‐sys

• Easy, human readable access to P_S and I_S info for typical use cases



SYS SCHEMA

•Pair views -‐ Ex: host_summary_by_file_io and x$host_summary_by_file_io

•Example views-‐ statements_with_full_table_scans

-‐ statements_with_runtimes_in_95th_percentile

-‐ io_by_thread_by_latency

-‐ memory_by_user_by_current_bytes

-‐ schema_redundent_indexes-‐



PERFORMANCE_SCHEMA

• Monitors at a low level

• Uses PERFORMANCE_SCHEMA storage engine• Available-‐ Current events

-‐ Event histories / Event summa@ons

• Configura@on is dynamic

• Query using SQL



PERFORMANCE_SCHEMA

• Using the PERFORMANCE_SCHEMA-‐ Manual

• Diagnose Problems -‐ hpps://dev.mysql.com/doc/en/performance-‐schema-‐examples.html

• Query Profiling -‐ hpps://dev.mysql.com/doc/en/performance-‐schema-‐query-‐profiling.html

-‐ Blog posts• Marc Alff’s blog -‐ hpp://marcalff.blogspot.com

• Mark Leith’s blog -‐ hpp://www.markleith.co.uk/

-‐ Many Presenta@ons/Webinars

(con’t)



MySQL Enterprise Monitor -‐ MEM

• Real @me monitoring-‐ Performance

-‐ Replica@on

-‐ Query analysis

-‐ InnoDB

-‐ Backup

-‐ Disk and OS



MEM -‐ Query Analysis



MEM -‐ File IO



MEM -‐ ReplicaNon



Oracle Enterprise Manager for MySQL

• Monitoring of MySQL servers in familiar OEM interface

• Real @me monitoring-‐ Performance

-‐ Replica@on

-‐ InnoDB

-‐ Metric Collec@on

•Won’t lie -‐ doesn’t do everything MEM does



OEM MySQL -‐ Performance Monitoring



OEM MySQL -‐ Performance Reports



OEM MySQL -‐ Metric & CollecNon



Basic TroubleshooNng



Step 1

• Define the problem• Must know what is “normal”, so you know when it is not -‐ and how much

• Be exact!• Read and understand the manual for the area that is problema@c



Step 2

• Collect the diagnos@c data-‐ OS data

-‐ MySQL data

• May need to collect the diagnos@c data during the problem-‐ Monitoring

-‐ Maybe pt-stalk



Error Log

• First place to look• Can give history and context to any problem.

• Error message(s)



Server Crash

• Error log-‐ Stack trace and error message(s)

• OS error log around the crash @me

• Any and all diagnos@c data available-‐ MySQL and OS monitoring data (graphs or raw data)

-‐ core file?

• Any informa@on about what was happening before and during the crash-‐ External Scripts running / Applica@ons / Cronjobs / Backups / Etc.



ReplicaNon Issues

• Error log• SHOW MASTER STATUS• my.cnf / my.ini

• SHOW GLOBAL VARIABLES• SHOW SLAVE STATUS



Performance Issues

• Error log • OS data (Ex: IO, CPU, Memory, NUMA, etc.)

• SHOW GLOBAL VARIABLES• SHOW GLOBAL STATUS• SHOW FULL PROCESSLIST• SHOW ENGINE INNODB STATUS• Informa@on from PERFORMANCE_SCHEMA



Query Performance Issues

• Error log• Slow Query Log• EXPLAIN • SHOW CREATE TABLE• SHOW TABLE STATUS• SHOW INDEXES• Profile the query



QuesNons?


Sunday, October 16, 16khankennels.com/presentations/pdf/Zend2016_DBA_tutorial.pdf ·...

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