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MySQL 管理工具集 percona-toolkit

apt-get install -y percona-toolkit

# 检查重复索引pt-duplicate-key-checker –host=’sohu.dev.chenpeng.info’ –port=’43307′ –databases=’grape’

# 运行状态监控pt-mysql-summary –host=’sohu.dev.chenpeng.info’ –port=’43307′ –databases=’grape’

# 在线修改表结构

pt-online-schema-change –host=’sohu.dev.chenpeng.info’ –port=’3306′ –alter “ADD COLUMN c1 INT” D=chenpeng_litchi,t=lc_operate_log –execute –print

pt-online-schema-change –host=’sohu.dev.chenpeng.info’ –port=’3306′ –alter “ENGINE=InnoDB” D=chenpeng_litchi,t=lc_operate_log –execute –print

# 格式化explain结果mysql -hsohu.dev.chenpeng.info -P43307 grape -e”explain SELECT a.line_id,b.dnf_source FROM gp_report_advertiser_day a INNER JOIN gp_line b ON a.line_id=b.id WHERE a.data_date=’2016-04-10′ LIMIT 100″ | pt-visual-explain

重复索引结果示例:

# ########################################################################

# grape.gp_mars_report_advertiser_hour                                   

# ########################################################################

# line_id is a left-prefix of line_id_data_time

# Key definitions:

#   KEY `line_id` (`line_id`) USING BTREE,

#   KEY `line_id_data_time` (`line_id`,`data_time`) USING BTREE

# Column types:

#      `line_id` bigint(20) unsigned not null comment ‘??id’

#      `data_time` datetime not null comment ‘??’

# To remove this duplicate index, execute:

ALTER TABLE `grape`.`gp_mars_report_advertiser_hour` DROP INDEX `line_id`;

# ########################################################################

# grape.gp_operate_log                                                   

# ########################################################################

# related_id is a left-prefix of search3

# Key definitions:

#   KEY `related_id` (`related_id`),

#   KEY `search3` (`related_id`,`opt_datetime`),

# Column types:

#      `related_id` int(10) unsigned not null comment ‘?????id’

#      `opt_datetime` datetime not null comment ‘??????’

# To remove this duplicate index, execute:

ALTER TABLE `grape`.`gp_operate_log` DROP INDEX `related_id`;

# ########################################################################

# grape.gp_report_advertiser_hour                                        

# ########################################################################

# idx_line_id is a left-prefix of line_id_data_time

# Key definitions:

#   KEY `idx_line_id` (`line_id`),

#   KEY `line_id_data_time` (`line_id`,`data_time`),

# Column types:

#      `line_id` bigint(20) not null

#      `data_time` datetime not null

# To remove this duplicate index, execute:

ALTER TABLE `grape`.`gp_report_advertiser_hour` DROP INDEX `idx_line_id`;

# ########################################################################

# Summary of indexes                                                     

# ########################################################################

# Size Duplicate Indexes   48

# Total Duplicate Indexes  3

# Total Indexes            268

工具检测到gp_operate_log有重复的索引,提供以下SQL语句删除重复的索引:

ALTER TABLE `grape`.`gp_operate_log` DROP INDEX `related_id`;

explain简化显示示例:

root@ubuntu:/tmp/d3OnxmMr# mysql -hsohu.dev.chenpeng.info -P43307 -ugrapeuser -pfaf74223tr grape -e”explain SELECT a.line_id,b.dnf_source FROM gp_report_advertiser_day a INNER JOIN gp_line b ON a.line_id=b.id WHERE a.data_date=’2016-04-10′ LIMIT 100″ | pt-visual-explain

JOIN

+- Filter with WHERE

|  +- Bookmark lookup

|     +- Table

|     |  table          b

|     |  possible_keys  PRIMARY

|     +- Unique index lookup

|        key            b->PRIMARY

|        possible_keys  PRIMARY

|        key_len        4

|        ref            grape.a.line_id

|        rows           1

+- Index lookup

key            a->data_date

possible_keys  line_id,data_date

key_len        3

ref            const

rows           10722

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