Voici le résultat du script 'tuning primer' que j'ai trouvé
launchpad.net/mysql-tuning-primer
-- MYSQL PERFORMANCE TUNING PRIMER --
- By: Matthew Montgomery -
MySQL Version 5.1.55 x86_64
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Uptime = days hrs min sec
Avg. qps = 23
Total Questions = 4496175
Threads Connected = 1
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:
dev.mysql.com/doc/refman/5.1/en/server-system-variables.html
Visit
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 = 10.000000 sec.
You have 15 out of 4496196 that take longer than 10.000000 sec. to complete
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tuning-primer.sh: line 606: [: -gt: unary operator expected
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/5.1/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 8
Current threads_cached = 6
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 500
Current threads_connected = 2
Historic max_used_connections = 36
The number of used connections is 7% of the configured maximum.
You are using less than 10% of your configured max_connections.
Lowering max_connections could help to avoid an over-allocation of memory
See "MEMORY USAGE" section to make sure you are not over-allocating
INNODB STATUS
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Current InnoDB index space = M
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Current InnoDB data space = M
Current InnoDB buffer pool free = 77 %
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Current innodb_buffer_pool_size = G
Depending 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
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tuning-primer.sh: line 459: [: max_memoryHR: integer expression expected
tuning-primer.sh: line 465: [: max_memoryHR: integer expression expected
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tuning-primer.sh: line 478: export: `=max_memoryHR': not a valid identifier
Max Memory Ever Allocated : bytes
tuning-primer.sh: line 459: [: per_thread_buffersHR: integer expression expected
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Configured Max Per-thread Buffers : bytes
tuning-primer.sh: line 459: [: global_buffersHR: integer expression expected
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tuning-primer.sh: line 478: export: `=global_buffersHR': not a valid identifier
Configured Max Global Buffers : bytes
tuning-primer.sh: line 459: [: total_memoryHR: integer expression expected
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tuning-primer.sh: line 478: export: `=total_memoryHR': not a valid identifier
Configured Max Memory Limit : bytes
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Physical Memory : G
Max memory limit seem to be within acceptable norms
KEY BUFFER
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Current MyISAM index space = M
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Current key_buffer_size = M
Key cache miss rate is 1 : 1379
Key buffer free ratio = %
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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
SORT OPERATIONS
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Current sort_buffer_size = M
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Current read_rnd_buffer_size = M
Sort buffer seems to be fine
JOINS
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Current join_buffer_size = M
You have had 78115 queries where a join could not use an index properly
join_buffer_size >= 4 M
This is not advised
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
OPEN FILES LIMIT
Current open_files_limit = 2500 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_open_cache = 512 tables
Current table_definition_cache = 256 tables
You have a total of 692 tables
You have 512 open tables.
Current table_cache hit rate is 6%
, while 100% of your table cache is in use
You should probably increase your table_cache
You should probably increase your table_definition_cache value.
TEMP TABLES
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Current max_heap_table_size = M
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Current tmp_table_size = M
Of 781812 temp tables, 36% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
Perhaps you should increase your tmp_table_size and/or max_heap_table_size
to reduce the number of disk-based temporary tables
Note! BLOB and TEXT columns are not allow in memory tables.
If you are using these columns raising these values might not impact your
ratio of on disk temp tables.
TABLE SCANS
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Current read_buffer_size = M
Current table scan ratio = 56 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 2501312
Your table locking seems to be fine