-- MYSQL PERFORMANCE TUNING PRIMER --
- By: Matthew Montgomery -
MySQL Version 4.1.22-standard x86_64
Uptime = 0 days 7 hrs 42 min 56 sec
Avg. qps = 512
Total Questions = 14242404
Threads Connected = 142
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/4.1/...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 31 out of 14244485 that take longer than 10 sec. to complete
Your long_query_time may be too high, I typically set this under 5 sec.
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/4.1/...-recovery.html
WORKER THREADS
Current thread_cache_size = 500
Current threads_cached = 430
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 1000
Current threads_connected = 98
Historic max_used_connections = 1001
The number of used connections is 100% of the configured maximum.
You should raise max_connections
MEMORY USAGE
Max Memory Ever Allocated : 128 G
Configured Max Per-thread Buffers : 126 G
Configured Max Global Buffers : 1 G
Configured Max Memory Limit : 127 G
Physical Memory : 11.73 G
Max memory limit exceeds 90% of physical memory
KEY BUFFER
Current MyISAM index space = 1 G
Current key_buffer_size = 1000 M
Key cache miss rate is 1 : 1092
Key buffer fill ratio = 20.00 %
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 = 600 M
Current query_cache_used = 68 M
Current query_cache_limit = 100 M
Current Query cache Memory fill ratio = 11.42 %
Current query_cache_min_res_unit = 4 K
Query Cache is 26 % fragmented
Run "FLUSH QUERY CACHE" periodically to defragment the query cache memory
If you have many small queries lower 'query_cache_min_res_unit' to reduce fragmentation.
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 = 64 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 1.00 M
You have had 11179 queries where a join could not use an index properly
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.
OPEN FILES LIMIT
Current open_files_limit = 5000 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 = 1024 tables
You have a total of 522 tables
You have 1024 open tables.
Current table_cache hit rate is 3%, while 100% of your table cache is in use
You should probably increase your table_cache
TEMP TABLES
Current max_heap_table_size = 449 M
Current tmp_table_size = 1.95 G
Of 931448 temp tables, 1% 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 = 63 M
Current table scan ratio = 2174 : 1
read_buffer_size is over 8 MB there is probably no need for such a large read_buffer
TABLE LOCKING
Current Lock Wait ratio = 1 : 5
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'
