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Configuration Optimization in MySQL Database

 
 

We may need to adjust the MySQL database default settings according to usage. Configuration settings can help the database work more efficiently. There are many tools used for MySQL database optimization. In this blog post, we will do optimization with the below tools:

 
  • MySQL Performance Tuning Primer
  • MySQL Check
 

MySQL Performance Tuning Primer

 

We can easily do MySQL database analysis using the Tuning Primer script.

NOTE: Before running this tool, the MySQL database must be running without interruption for 48 hours.

 

We can perform the following database tests with Turning Primer:

 
  • Slow Query Log
  • Max Connections
  • Worker Threads
  • Key Buffer
  • Query Cache
  • Sort Buffer
  • Joins
  • Temp Tables
  • Table (Open & Definition) Cache
  • Table Locking
  • Table Scans (read_buffer)
  • InnoDB Status
 

We can begin testing by downloading the tuning-primer.sh script at https://launchpad.net/mysql-tuning-primer/trunk and running:

 

# chmod u+x tuning-primer.sh

# ./tuning-primer.sh

 

Step 1:

 
– MYSQL PERFORMANCE TUNING PRIMER — — By: Matthew Montgomery — MySQL Version 5.0.95 x86_64 Uptime = 6 days 1 hrs 19 min 4 sec Avg. qps = 39 Total Questions = 20796802
Threads Connected = 9
Server has been running for over 48hrs.
It should be safe to follow these recommendations
To find out more information on how each of these
runtime variables effects performance visit:
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html
Visit http://www.mysql.com/products/enterprise/advisors.html
for info about MySQL’s Enterprise Monitoring and Advisory Service
SLOW QUERIES
The slow query log is NOT enabled.
Current long_query_time = 10 sec.
You have 3510 out of 20796847 that take longer than 10 sec. to complete
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.0/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 0
Current threads_cached = 0
Current threads_per_sec = 1
Historic threads_per_sec = 1
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 100
Current threads_connected = 9
Historic max_used_connections = 101
The number of used connections is 101% of the configured maximum.
You should raise max_connections
 

The script indicates that the number of max_connection is insufficient in the row marked with red and this number should be increased. So the test result is: MySQL connections have experienced problems with this parameter.

 

We can solve this by increasing the number of max_connections in MySQL configuration.

 

Solution:

 

# vi /etc/my.cnf

..

.

# Under MySQL header;

Current max_connections = 100

 

Step 2:

 
INNODB STATUS Current InnoDB index space = 20 MCurrent InnoDB data space = 24 MCurrent InnoDB buffer pool free = 0 %Current innodb_buffer_pool_size = 8 MDepending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory
MEMORY USAGE
Max Memory Ever Allocated : 295 M
Configured Max Per-thread Buffers : 274 M
Configured Max Global Buffers : 17 M
Configured Max Memory Limit : 292 M
Physical Memory : 3.83 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 488 M
Current key_buffer_size = 7 M
Key cache miss rate is 1 : 11
Key buffer free ratio = 80 %
Your key_buffer_size seems to be fine
QUERY CACHE
Query cache is supported but not enabled
Perhaps you should set the query_cache_size

 

Secondly, we received a warning due to the query_cache_size field. For this; we can set the query_cache_size limit to 128 MB as default, or we can define this field using the MySQL Tuner tool.

 

Solution:

 

# vi /etc/my.cnf

..

.

# Under MySQL header;

query_cache_size=128M query_cache_limit=1M
 

Step 3:

 

By continuing to run the script, we continue to optimize.

 
SORT OPERATIONS Current sort_buffer_size = 2 MCurrent read_rnd_buffer_size = 256 KSort buffer seems to be fineJOINSCurrent join_buffer_size = 132.00 K
You have had 7728 queries where a join could not use an index properly
You have had 7212 joins without keys that check for key usage after each row
You should enable “log-queries-not-using-indexes”
Then look for non-indexed joins in the slow query log.
If you are unable to optimize your queries you may want to increase your
join_buffer_size to accommodate larger joins in one pass.
Note! This script will still suggest raising the join_buffer_size when
ANY joins not using indexes are found.
 

The script recommends adding the log-slow-queries parameter.

 

Solution:

# vi /etc/mysql/my.cnf

..

.

log-slow-queries = /var/log/mysql/slow.log

 

Step 4:

 
OPEN FILES LIMIT Current open_files_limit = 1024 filesThe open_files_limit should typically be set to at least 2x-3xthat of table_cache if you have heavy MyISAM usage.Your open_files_limit value seems to be fine TABLE CACHE
Current table_cache value = 64 tables
You have a total of 12326 tables
You have 64 open tables.
Current table_cache hit rate is 0%
, while 100% of your table cache is in use
You should probably increase your table_cache
 

The warning indicates that there is insufficient space in table_cache.

 

Approximately;

12326 x 4 = 49304 → It is determined as 64535 because of 2 and multiplies.

NOTE: If we increase the space of table_cache too much, we should take into account that there will be RAM loss.

 

Solution:

 

# vi /etc/mysql/my.cnf

..

.

table_cache= 64535
 

Step 5:

 
TEMP TABLES Current max_heap_table_size = 16 MCurrent tmp_table_size = 32 MOf 356862 temp tables, 22% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
Created disk tmp tables ratio seems fine
TABLE SCANS
Current read_buffer_size = 128 K
Current table scan ratio = 851 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 104
You may benefit from selective use of InnoDB.
If you have long running SELECT’s against MyISAM tables and perform
frequent updates consider setting ‘low_priority_updates=1′
If you have a high concurrency of inserts on Dynamic row-length tables
consider setting ‘concurrent_insert=2′.

thread_concurrency = 8 — → You can enter as CPU x 2.

 

Activating # Bin file will help repairing the erroneous files in the future.

log-bin=/var/lib/mysql/mysql-bin

# binary logging format — mixed recommended

binlog_format=mixed

# If there will be replication, we should add the corresponding server information

# remove comment sections. ID for Master is 1, for Slave is 2.

# server-id = 1

# CHANGE MASTER TO MASTER_HOST=’125.564.12.1′

# MASTER_PORT=3306

# MASTER_USER=’joe’

# MASTER_PASSWORD=’secret’

innodb_data_home_dir = /var/lib/mysql innodb_data_file_path = ibdata1:10M:autoextend innodb_log_group_home_dir = /var/lib/mysql

innodb_buffer_pool_size = 256M innodb_additional_mem_pool_size = 20M

innodb_log_file_size = 64M innodb_log_buffer_size = 8M innodb_flush_log_at_trx_commit = 1 innodb_lock_wait_timeout = 50

 

We should restart MySQL for the settings to take effect.

 

NOTE: I recommend checking the logs for any errors.

 

MySQL Check

 

We’ll use MySQLCheck as another tool for MySQL database performance testing.

 

1. Database Control

# mysqlcheck -cA -u root -p
Enter password:
company.contacts                                   OK
mysql.columns_priv                                 OK
mysql.db                                           OK
mysql.event                                        OK
mysql.func                                         OK
mysql.general_log
Error    : You can't use locks with log tables.
status   : OK
mysql.help_category                                OK
mysql.help_keyword                                 OK
mysql.help_relation                                OK
mysql.help_topic                                   OK
mysql.host                                         OK
mysql.ndb_binlog_index                             OK
mysql.plugin                                       OK
mysql.proc                                         OK
mysql.procs_priv                                   OK
mysql.servers                                      OK
mysql.slow_log
Error    : You can't use locks with log tables.
status   : OK
mysql.tables_priv                                  OK
mysql.time_zone                                    OK
mysql.time_zone_leap_second                        OK
mysql.time_zone_name                               OK
mysql.time_zone_transition                         OK
mysql.time_zone_transition_type                    OK
mysql.user                                         OK
phpmyadmin.pma_bookmark                            OK
phpmyadmin.pma_column_info                         OK
phpmyadmin.pma_designer_coords                     OK
phpmyadmin.pma_history                             OK
phpmyadmin.pma_pdf_pages                           OK
phpmyadmin.pma_relation                            OK
phpmyadmin.pma_table_coords                        OK
phpmyadmin.pma_table_info                          OK
phpmyadmin.pma_tracking                            OK
phpmyadmin.pma_userconfig                          OK
 

2. Optimization

$ mysqlcheck -oA -u root -p

(-o for optimize)

$ mysqlcheck -oA -u root -p
Enter password:
company.contacts                                   Table is already up to date
mysql.columns_priv                                 Table is already up to date
mysql.db                                           OK
mysql.event                                        Table is already up to date
mysql.func                                         Table is already up to date
mysql.general_log
note     : The storage engine for the table doesn't support optimize
mysql.help_category                                OK
mysql.help_keyword                                 OK
mysql.help_relation                                OK
mysql.help_topic                                   OK
mysql.host                                         Table is already up to date
mysql.ndb_binlog_index                             Table is already up to date
mysql.plugin                                       Table is already up to date
mysql.proc                                         Table is already up to date
mysql.procs_priv                                   OK
mysql.servers                                      Table is already up to date
mysql.slow_log
note     : The storage engine for the table doesn't support optimize
mysql.tables_priv                                  OK
mysql.time_zone                                    Table is already up to date
mysql.time_zone_leap_second                        Table is already up to date
mysql.time_zone_name                               Table is already up to date
mysql.time_zone_transition                         Table is already up to date
mysql.time_zone_transition_type                    Table is already up to date
mysql.user                                         OK
phpmyadmin.pma_bookmark                            Table is already up to date
phpmyadmin.pma_column_info                         Table is already up to date
phpmyadmin.pma_designer_coords                     Table is already up to date
phpmyadmin.pma_history                             Table is already up to date
phpmyadmin.pma_pdf_pages                           Table is already up to date
phpmyadmin.pma_relation                            Table is already up to date
phpmyadmin.pma_table_coords                        Table is already up to date
phpmyadmin.pma_table_info                          Table is already up to date
phpmyadmin.pma_tracking                            Table is already up to date
phpmyadmin.pma_userconfig                          OK


3. Repair of Damaged Databases

$ mysqlcheck -rA -u root -p

(-r for repair)

$ mysqlcheck -rA -u root -p
Enter password:
company.contacts                                   OK
mysql.columns_priv                                 OK
mysql.db                                           OK
mysql.event                                        OK
mysql.func                                         OK
mysql.general_log                                  OK
mysql.help_category                                OK
mysql.help_keyword                                 OK
mysql.help_relation                                OK
mysql.help_topic                                   OK
mysql.host                                         OK
mysql.ndb_binlog_index                             OK
mysql.plugin                                       OK
mysql.proc                                         OK
mysql.procs_priv                                   OK
mysql.servers                                      OK
mysql.slow_log                                     OK
mysql.tables_priv                                  OK
mysql.time_zone                                    OK
mysql.time_zone_leap_second                        OK
mysql.time_zone_name                               OK
mysql.time_zone_transition                         OK
mysql.time_zone_transition_type                    OK
mysql.user                                         OK
phpmyadmin.pma_bookmark                            OK
phpmyadmin.pma_column_info                         OK
phpmyadmin.pma_designer_coords                     OK
phpmyadmin.pma_history                             OK
phpmyadmin.pma_pdf_pages                           OK
phpmyadmin.pma_relation                            OK
phpmyadmin.pma_table_coords                        OK
phpmyadmin.pma_table_info                          OK
phpmyadmin.pma_tracking                            OK
phpmyadmin.pma_userconfig                          OK
 

Sources;


Author: Kartaca

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