mysql的基本命令

查看数据库后台进程状态
show processlist;只列出前100条，如果想全列出请使用show full processlist; 

查看表结构
show columns from t_user_detail_final;
查看数据库
show databases;
查看表
show tables;

查看innodb_buffer大小

select @@innodb_buffer_pool_size/1024/1024/1024;

设置innodb_buffer大小为16G

set global innodb_buffer_pool_size =17179869184;

查看mysql数据库账号的授权信息

show grants for root@'%';

查询行数前十的数据量

SELECT table_schema,table_name,table_type,ENGINE,table_rows,avg_row_length,concat(round(data_length/1024/1024,2),'MB') AS data_length,concat(round(index_length/1024/1024,2),'MB') AS index_length,concat(round(data_free/1024/1024,2),'MB') AS data_free,concat(round((data_length+index_length)/1024/1024,2),'MB') AS total_size FROM information_schema.TABLES WHERE table_schema NOT IN ('information_schema','performance_schema','mysql','sys') ORDER BY table_rows DESC LIMIT 10;

账号授权

mysql -uhomed -pShand@123@345@567 "GRANT ALL PRIVILEGES ON *.* TO 'homed'@'%' identified by 'Shand@123@345@567' WITH GRANT OPTION";

数据库的备份命令

 备份所有的数据库

mysqldump -uroot -pZBGD&123&456 --single-transaction --events --triggers   --set-gtid-purged=OFF --routines --flush-logs --master-data=2 --all-databases > bak_all_first.sql

备份单个数据库

mysqldump -uroot -h192.168.52.205 -p'123&456@iPanel&ZbGd' --set-gtid-purged=OFF homed_ilog t_user_hits_info > t_user_hits_info.sql

mysqldump -hlocalhost -udbbackup -pdbbackup -P3306 --quote-names --skip-opt --add-locks --extended-insert --disable-keys --set-charset --create-options --single-transaction -q --no-autocommit -R -E --default-character-set=utf8 --master-data=2 -A>XXX.sql

使用mydumper工具备份数据库
time /usr/local/bin/mydumper -h 192.168.10.31 -u root -p 'p@sswd_ipanel123' --build-empty-files --long-query-guard 300 --kill-long-queries -c --threads=4 --regex '^(?!(sys|information_schema|performance_schema|tpcc1000))' -G -E -R -o /r2/baksql/201907022000_slave1 &
time /usr/local/bin/mydumper -h 192.168.10.33 -u root -p 'p@sswd_ipanel123' --build-empty-files --long-query-guard 300 --kill-long-queries -c --threads=4 --regex '^(?!(sys|information_schema|performance_schema|tpcc1000))' -G -E -R -o /r2/baksql/201907022000_slave3 &
time /usr/local/bin/mydumper -h 192.168.10.35 -u root -p 'p@sswd_ipanel123' --build-empty-files --long-query-guard 300 --kill-long-queries -c --threads=4 --regex '^(?!(sys|information_schema|performance_schema|tpcc1000))' -G -E -R -o /r2/baksql/201907022000_slave5 &

使用备份的数据恢复数据库

/usr/local/bin/myloader --host=127.0.0.1 --user=root --password=test**** --port=3306 --overwrite-tables -q 50000 --threads 10  --enable-binlog -d /r2/baksql/201809211021/

恢复slave的库可以去掉--enable-binlog

/usr/bin/myloader --host=192.168.1.0 --user=root --password=111111 --port=3306 --overwrite-tables -q 50000 --threads 10 -d /r2/baksql/202009250939/

使用mysqlbinlog工具查看sql

注意:

不要查看当前正在写入的binlog文件

不要加--force参数强制访问

如果binlog格式是行模式的,请加 -vv参数

使用mysqlbinlog工具查看sql
mysqlbinlog --start-datetime="2018-11-08 17:30:54" --stop-datetime="2018-11-08 17:47:53" binlog.001443 | grep delete | grep user_watching | wc -l

 --set-gtid-purged=OF