用MySQL自带工具mysqlslap对数据库进行压力测试

mysqlslap是mysql自带的工具，不需要单独安装：

参数：
-concurrency 代表并发数量，多个可以用逗号隔开，concurrency=10,50,100, 并发连接线程数分别是10、50、100个并发。

--engines 代表要测试的引擎，可以有多个，用分隔符隔开。

--iterations 代表要运行这些测试多少次。

--auto-generate-sql 代表用系统自己生成的SQL脚本来测试。

--auto-generate-sql-load-type 代表要测试的是读还是写还是两者混合的（read,write,update,mixed）

--number-of-queries 代表总共要运行多少次查询。每个客户运行的查询数量可以用查询总数/并发数来计算。

--debug-info 代表要额外输出CPU以及内存的相关信息。

--number-int-cols ：创建测试表的 int 型字段数量

--auto-generate-sql-add-autoincrement : 代表对生成的表自动添加auto_increment列，从5.1.18版本开始

--number-char-cols 创建测试表的 char 型字段数量。

--create-schema 测试的schema，MySQL中schema也就是database。

--query 使用自定义脚本执行测试，例如可以调用自定义的一个存储过程或者sql语句来执行测试。

--only-print 如果只想打印看看SQL语句是什么，可以用这个选项。

1，简单用法

[root@linuxidc /home/aolens]# mysqlslap --user=root --password=password --auto-generate-sql
 
Benchmark
 
Average number of seconds to run all queries: 0.002 seconds
 
Minimum number of seconds to run all queries: 0.002 seconds
 
Maximum number of seconds to run all queries: 0.002 seconds
 
Number of clients running queries: 1
 
Average number of queries per client: 0

结果中各项含义：

Average number of ... 运行所有语句的平均秒数

Minimum number of ... 运行所有语句的最小秒数

Maximum number of ... 运行所有语句的最大秒数

Number of clients ... 客户端数量

Average number of queries per client 每个客户端运行查询的平均数

2，添加并发

[root@linuxidc /home/aolens]# mysqlslap --user=root --password=password --auto-generate-sql --concurrency=100 --number-of-queries=1000
Benchmark
Average number of seconds to run all queries: 0.316 seconds
Minimum number of seconds to run all queries: 0.316 seconds
Maximum number of seconds to run all queries: 0.316 seconds
Number of clients running queries: 100
Average number of queries per client: 10

3，使用自己测试库和测试语句

[root@linuxidc /home/aolens]# mysqlslap --user=root --password=password --concurrency=10 --number-of-queries=100 --create-schema=wordpress --query="SELECT * FROM wordpress.wp_posts;"
Benchmark
Average number of seconds to run all queries: 4.255 seconds
Minimum number of seconds to run all queries: 4.255 seconds
Maximum number of seconds to run all queries: 4.255 seconds
Number of clients running queries: 10
Average number of queries per client: 10

4，结合实际，对网站首页所请求的数据库连接做压力测试
数据库Mariadb 10.0.14

首先给数据库安装审计插件，并启用

MariaDB [(none)]> show variables like '%audit%'
-> ;
+-------------------------------+-----------------------+
| Variable_name | Value |
+-------------------------------+-----------------------+
| server_audit_events | |
| server_audit_excl_users | |
| server_audit_file_path | server_audit.log |
| server_audit_file_rotate_now | OFF |
| server_audit_file_rotate_size | 1000000 |
| server_audit_file_rotations | 9 |
| server_audit_incl_users | |
| server_audit_logging | OFF |
| server_audit_mode | 0 |
| server_audit_output_type | file |
| server_audit_syslog_facility | LOG_USER |
| server_audit_syslog_ident | mysql-server_auditing |
| server_audit_syslog_info | |
| server_audit_syslog_priority | LOG_INFO |
+-------------------------------+-----------------------+
14 rows in set (0.00 sec)

发现已经安装了，没有安装的MariaDB [(none)]> INSTALL PLUGIN server_audit SONAME 'server_audit.so';

命令行启动审计功能：

命令行启用audit ，重启后失效

MariaDB [(none)]> set global server_audit_file_rotate_size=1024*1024*1024;
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> set global server_audit_events='query,table';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> set global server_audit_file_rotate_now=on;
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> set global server_audit_logging='ON';
Query OK, 0 rows affected (0.00 sec)

刷新一下首页查看审计日志里都有哪些SQL操作，对这些SQL进行压测：

mysqlslap --user=root --password=password --concurrency=20 --number-of-queries=1000 --create-schema=wordpress --query=" \
SELECT option_name, option_value FROM wp_options WHERE autoload = 'yes'; \
SELECT option_value FROM wp_options WHERE option_name = 'a3_lz_google_api_key' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'a3_lz_google_api_key_enable' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = '_transient_timeout_a3_lz_google_api_key_status' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = '_transient_a3_lz_google_api_key_status' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'wordpress_api_key' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'onp_license_clipboard-images' LIMIT 1; \
SELECT autoload FROM wp_options WHERE option_name = 'onp_license_clipboard-images'; \
SELECT option_value FROM wp_options WHERE option_name = 'onp_version_check_clipboard-images' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'ossdl_https' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'uninstall_plugins' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'a3_lazy_load_just_installed' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'akismet_comment_nonce' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'preload_cache_counter' LIMIT 1; \
SELECT option_value FROM wp_options WHERE option_name = 'rewrite_rules' LIMIT 1; \
......"
Benchmark
Average number of seconds to run all queries: 40.931 seconds
Minimum number of seconds to run all queries: 40.931 seconds
Maximum number of seconds to run all queries: 40.931 seconds
Number of clients running queries: 20
Average number of queries per client: 50