[笔记]MYSQL官方提供这个脚本实在是太好了

地址：
http://www.day32.com/MySQL/

我的测试机器运行结果。

[root@localhost david_yeung]# ./tuning-primer.sh all|more

        -- MYSQL PERFORMANCE TUNING PRIMER --
             - By: Matthew Montgomery -

MySQL Version 5.0.45-log i686

Uptime = 15 days 1 hrs 24 min 34 sec
Avg. qps = 1
Total Questions = 2088868
Threads Connected = 13

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:
http://dev.mysql.com/doc/refman/ ... stem-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 enabled.
Current long_query_time = 1 sec.
You have 144295 out of 2088889 that take longer than 1 sec. to complete
Your long_query_time seems to be fine

BINARY UPDATE LOG
The binary update log is enabled

WORKER THREADS
Current thread_cache_size = 32
Current threads_cached = 19
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 = 13
Historic max_used_connections = 32
The number of used connections is 32% of the configured maximum.
Your max_connections variable seems to be fine.

MEMORY USAGE
Max Memory Ever Allocated : 998 M
Configured Max Per-thread Buffers : 633 M
Configured Max Global Buffers : 796 M
Configured Max Memory Limit : 1 G
Physical Memory : 946.57 M

Max memory limit exceeds 90% of physical memory

KEY BUFFER
Current MyISAM index space = 157 M
Current key_buffer_size = 256 M
Key cache miss rate is 1 : 464
Key buffer fill ratio = 2.00 %
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 = 256 M
Current query_cache_used = 18 M
Current query_cache_limit = 64 M
Current Query cache Memory fill ratio = 7.37 %
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 = 1 M
Current read_rnd_buffer_size = 3 M
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 132.00 K
You have had 2 queries where a join could not use an index properly
You have had 2 joins without keys that check for key usage after each row
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 = 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 = 512 tables
You have a total of 472 tables
You have 473 open tables.
The table_cache value seems to be fine

TEMP TABLES
Current max_heap_table_size = 64 M
Current tmp_table_size = 64 M
Of 50784 temp tables, 23% were created on disk
Created disk tmp tables ratio seems fine

TABLE SCANS
Current read_buffer_size = 1020 K
Current table scan ratio = 738 : 1
read_buffer_size seems to be fine

TABLE LOCKING
Current Lock Wait ratio = 1 : 11710
Your table locking seems to be fine