-- MYSQL PERFORMANCE TUNING PRIMER --
- By: Matthew Montgomery -
MySQL Version 5.0.51a-community i686
Uptime = 2 days 21 hrs 49 min 42 sec
Avg. qps = 37
Total Questions = 9530458
Threads Connected = 7
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:
MySQL :: MySQL 5.0 Reference Manual :: 5.1.3 System Variables
Visit
MySQL :: MySQL Enterprise Advisors
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 9421 out of 9530888 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
MySQL :: MySQL 5.0 Reference Manual :: 6.3 Point-in-Time Recovery
WORKER THREADS
Current thread_cache_size = 128
Current threads_cached = 121
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 350
Current threads_connected = 4
Historic max_used_connections = 152
The number of used connections is 43% of the configured maximum.
Your max_connections variable seems to be fine.
MEMORY USAGE
Max Memory Ever Allocated : 804 M
Configured Max Per-thread Buffers : 1 G
Configured Max Global Buffers : 170 M
Configured Max Memory Limit : 1 G
Physical Memory : 2.97 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 139 M
Current key_buffer_size = 128 M
Key cache miss rate is 1 : 48650
Key buffer fill ratio = 64.00 %
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 = 32 M
Current query_cache_used = 17 M
Current query_cache_limit = 4 M
Current Query cache Memory fill ratio = 54.53 %
Current query_cache_min_res_unit = 4 K
Query Cache is 21 % 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.
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 1 M
Current read_rnd_buffer_size = 1020 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 1.00 M
You have had 72 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 = 4360 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 = 2000 tables
You have a total of 273 tables
You have 1909 open tables.
Current table_cache hit rate is 86%, while 95% 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 81888 temp tables, 15% 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 = 1020 K
Current table scan ratio = 742 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 609
You may benefit from selective use of InnoDB.
If you have a high concurrency of inserts on Dynamic row-length tables
consider setting 'concurrent_insert=2'.
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