MySQL Performance Tuning mit Tuning-Primer.sh Script
Quelle
Das Script ist von den MySQL Programmieren. Es analysiert und macht Verbesserungsvorschläge.
Anleitung: (Installation)
#per SSH mit root einloggen, dann mit
cd /usr
cd bin
#in das /usr/bin Verzeichnis wechseln. Nun kopieren wir tuning-primer.sh in das
#/bin Verzeichnis
wget http://www.day32.com/MySQL/tuning-primer.sh
#und setzen die Zugriffsrechte mit
chmod 755 tuning-primer.sh
#nun rufen wir das Script auf mit
tuning-primer.sh
oder
./tuning-primer.sh
Ausgabe Beispiel:
SLOW QUERIES
Current long_query_time = 2 sec.
You have 0 out of 40657 that take longer than 2 sec. to complete
The slow query log is enabled.
Your long_query_time seems to be fine
WORKER THREADS
Current thread_cache_size = 0
Current threads_cached = 0
Current threads_per_sec = 1
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 25
Current threads_connected = 1
Historic max_used_connections = 5
The number of used connections is 20% of the configured maximum.
Your max_connections variable seems to be fine.
MEMORY USAGE
Max Memory Ever Allocated : 9 M
Configured Max Per-thread Buffers : 26 M
Configured Max Global Buffers : 4 M
Configured Max Memory Limit : 31 M
Total System Memory : 10 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 1 M
Current key_buffer_size = 1 M
Key cache miss rate is 1 : 190
Key buffer fill ratio = 6.00 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere
QUERY CACHE
Query cache is enabled
Current query_cache_size = 512 K
Current query_cache_used = 364 K
Current query_cach_limit = 1 M
Current Query cache fill ratio = 71.28 %
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 512 K
Current record/read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 132.00 K
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
OPEN FILES LIMIT
Current open_files_limit = 1024 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_cache value = 256 tables
You have a total of 227 tables
You have 50 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 16 M
Current tmp_table_size = 32 M
Of 1091 temp tables, 84% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
Perhaps you should increase your max_heap_table_size and/or tmp_table_size to reduce the number of disk-based temporary tables
TABLE SCANS
Current read_buffer_size = 128 K
Current table scan ratio = 3409 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 424
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
Hilfreiche Links:
MySQL Variables
MySQL Optimieren von Thomas Schefter
Quelle
Das Script ist von den MySQL Programmieren. Es analysiert und macht Verbesserungsvorschläge.
Anleitung: (Installation)
#per SSH mit root einloggen, dann mit
cd /usr
cd bin
#in das /usr/bin Verzeichnis wechseln. Nun kopieren wir tuning-primer.sh in das
#/bin Verzeichnis
wget http://www.day32.com/MySQL/tuning-primer.sh
#und setzen die Zugriffsrechte mit
chmod 755 tuning-primer.sh
#nun rufen wir das Script auf mit
tuning-primer.sh
oder
./tuning-primer.sh
Ausgabe Beispiel:
SLOW QUERIES
Current long_query_time = 2 sec.
You have 0 out of 40657 that take longer than 2 sec. to complete
The slow query log is enabled.
Your long_query_time seems to be fine
WORKER THREADS
Current thread_cache_size = 0
Current threads_cached = 0
Current threads_per_sec = 1
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 25
Current threads_connected = 1
Historic max_used_connections = 5
The number of used connections is 20% of the configured maximum.
Your max_connections variable seems to be fine.
MEMORY USAGE
Max Memory Ever Allocated : 9 M
Configured Max Per-thread Buffers : 26 M
Configured Max Global Buffers : 4 M
Configured Max Memory Limit : 31 M
Total System Memory : 10 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 1 M
Current key_buffer_size = 1 M
Key cache miss rate is 1 : 190
Key buffer fill ratio = 6.00 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere
QUERY CACHE
Query cache is enabled
Current query_cache_size = 512 K
Current query_cache_used = 364 K
Current query_cach_limit = 1 M
Current Query cache fill ratio = 71.28 %
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 512 K
Current record/read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 132.00 K
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
OPEN FILES LIMIT
Current open_files_limit = 1024 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_cache value = 256 tables
You have a total of 227 tables
You have 50 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 16 M
Current tmp_table_size = 32 M
Of 1091 temp tables, 84% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
Perhaps you should increase your max_heap_table_size and/or tmp_table_size to reduce the number of disk-based temporary tables
TABLE SCANS
Current read_buffer_size = 128 K
Current table scan ratio = 3409 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 424
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
Hilfreiche Links:
MySQL Variables
MySQL Optimieren von Thomas Schefter
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