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May 16, 2011 21:03
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-- MYSQL PERFORMANCE TUNING PRIMER -- | |
- By: Matthew Montgomery - | |
MySQL Version 5.0.32-Debian_7etch5-log i486 | |
Uptime = 0 days 0 hrs 38 min 25 sec | |
Avg. qps = 3 | |
Total Questions = 8895 | |
Threads Connected = 3 | |
Warning: Server has not been running for at least 48hrs. | |
It may not be safe to use 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 0 out of 8916 that take longer than 10 sec. to complete | |
Your long_query_time seems to be fine | |
BINARY UPDATE LOG | |
The binary update log is enabled | |
Binlog sync is not enabled, you could loose binlog records during a server crash | |
WORKER THREADS | |
Current thread_cache_size = 8 | |
Current threads_cached = 1 | |
Current threads_per_sec = 0 | |
Historic threads_per_sec = 0 | |
Your thread_cache_size is fine | |
MAX CONNECTIONS | |
Current max_connections = 100 | |
Current threads_connected = 3 | |
Historic max_used_connections = 4 | |
The number of used connections is 4% 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 | |
Current InnoDB index space = 4 M | |
Current InnoDB data space = 61 M | |
Current InnoDB buffer pool free = 0 % | |
Current innodb_buffer_pool_size = 8 M | |
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 | |
Max Memory Ever Allocated : 52 M | |
Configured Max Per-thread Buffers : 265 M | |
Configured Max Global Buffers : 42 M | |
Configured Max Memory Limit : 307 M | |
Physical Memory : 768 M | |
Max memory limit seem to be within acceptable norms | |
KEY BUFFER | |
Current MyISAM index space = 5 M | |
Current key_buffer_size = 16 M | |
Key cache miss rate is 1 : 1 | |
Key buffer free ratio = 88 % | |
Your key_buffer_size seems to be fine | |
QUERY CACHE | |
Query cache is enabled | |
Current query_cache_size = 16 M | |
Current query_cache_used = 1 M | |
Current query_cache_limit = 1 M | |
Current Query cache Memory fill ratio = 11.64 % | |
Current query_cache_min_res_unit = 4 K | |
Your query_cache_size seems to be too high. | |
Perhaps you can use these resources elsewhere | |
MySQL won't cache query results that are larger than query_cache_limit in size | |
SORT OPERATIONS | |
Current sort_buffer_size = 2 M | |
Current read_rnd_buffer_size = 256 K | |
No sort operations have been performed | |
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 = 64 tables | |
You have a total of 657 tables | |
You have 64 open tables. | |
Current table_cache hit rate is 2% | |
, while 100% of your table cache is in use | |
You should probably increase your table_cache | |
TEMP TABLES | |
Current max_heap_table_size = 16 M | |
Current tmp_table_size = 32 M | |
Of 411 temp tables, 37% 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 | |
Current read_buffer_size = 128 K | |
Current table scan ratio = 18918 : 1 | |
You have a high ratio of sequential access requests to SELECTs | |
You may benefit from raising read_buffer_size and/or improving your use of indexes. | |
TABLE LOCKING | |
Current Lock Wait ratio = 0 : 9174 | |
Your table locking seems to be fine |
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