mysql性能优化工具--tuner-primer使用介绍

下载并改变执行权限：
wget http://www.day32.com/MySQL/tuning-primer.sh
chmod +x tuning-primer.sh
./tuning-primer.sh

结果报告：
会用几种颜色标记：
蓝色：总指标
绿色：表示此参数还可以
红色：表示此参数有严重问题
深红色：表示有问题参数
黄色：一些信息提示
而且还有警告：
Note! This script will still suggest raising the join_buffer_size when
ANY joins not using indexes are found.

下面是一个报告的结果

xx@xxxxxx:~$ . ./tuning-primer.sh
mysqld is alive

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

MySQL Version 5.1.32-enterprise-gpl-log x86_64

Uptime = 4 days 0 hrs 48 min 3 sec
Avg. qps = 255
Total Questions = 88956118
Threads Connected = 4

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/5.1/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 = 10.000000 sec.
You have 9589 out of 88956228 that take longer than 10.000000 sec. to complete
Your long_query_time seems to be fine

BINARY UPDATE LOG
The binary update log is enabled
The expire_logs_days is not set.
The mysqld will retain the entire binary log until RESET MASTER or PURGE MASTER LOGS commands are run manually
Setting expire_logs_days will allow you to remove old binary logs automatically
See http://dev.mysql.com/doc/refman/5.1/en/purge-master-logs.html

WORKER THREADS
Current thread_cache_size = 32
Current threads_cached = 29
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine

MAX CONNECTIONS
Current max_connections = 151
Current threads_connected = 4
Historic max_used_connections = 84
The number of used connections is 55% of the configured maximum.
Your max_connections variable seems to be fine.

MEMORY USAGE
Max Memory Ever Allocated : 11.87 G
Configured Max Per-thread Buffers : 10.38 G
Configured Max Global Buffers : 6.10 G
Configured Max Memory Limit : 16.48 G
Physical Memory : 8.00 G

Max memory limit exceeds 90% of physical memory

（内存设置严重有问题！--By Me）

KEY BUFFER
1714734 * 1024 / 2147483648 * 100
Current MyISAM index space = 8 K
Current key_buffer_size = 2.00 G
Key cache miss rate is 1 : 585673
Key buffer free ratio = 0 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere


（错误参数设置：query_cache_size > query_cache_limit --By Me）
SORT OPERATIONS
Current sort_buffer_size = 4 M
Current read_rnd_buffer_size = 64 M
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 132.00 K
You have had 1 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.

（ join_buffer_size设置过小，另外存在一个查询使用了join但是没有走索引 --By Me）

OPEN FILES LIMIT
Current open_files_limit = 1185 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 0 tables
You have 125 open tables.

TABLE SCANSCurrent read_buffer_size = 2 M
Current table scan ratio = 4650 : 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 = 1 : 5833374
Your table locking seems to be fine

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