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@@ -7,68 +7,68 @@ categories: ["database"]
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---
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## MySQL 5.7 配置文件 my.cnf
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```
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[mysqld]
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datadir = /db/mysql
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socket = /var/lib/mysql/mysql.sock
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symbolic-links = 0
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log-timestamps = SYSTEM
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slow-query-log = 1
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slow-query-log-file = /var/log/mysqld/slow.log
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long-query-time = 8
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#log-queries-not-using-indexes = 1
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log-error = /var/log/mysqld/error.log
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pid-file = /var/run/mysqld/mysqld.pid
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max-connections = 1000
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max-connect-errors = 1000
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max-user-connections = 600
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interactive-timeout = 3600
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wait-timeout = 3600
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skip-name-resolve = 1
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lower-case-table-names = 1
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default-time-zone = '+08:00'
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character-set-server = utf8mb4
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sql-mode = NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
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bind-address = 0.0.0.0
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table-open-cache = 2048
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default-storage-engine = innodb
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innodb-autoinc-lock-mode = 2
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innodb-flush-log-at-trx-commit = 0
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# 建议物理内存一半
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innodb-buffer-pool-size = 8G
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innodb-buffer-pool-instances = 8
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max-allowed-packet = 512M
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query-cache-size = 0
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query-cache-type = 0
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# 建议点分 ip 的最后一个数字
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server-id = 123
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# bin log
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#binlog-format = ROW
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#log-bin = /var/lib/mysql/mysql-bin
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#expire-logs-days = 3
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# relay log
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#read-only = 1
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#replicate-wild-do-table = db1.%
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#relay-log = /var/lib/mysql/mysql-relay-bin
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#slave-parallel-type = logical-clock
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```
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```
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[mysqld]
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datadir = /db/mysql
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socket = /var/lib/mysql/mysql.sock
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symbolic-links = 0
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log-timestamps = SYSTEM
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slow-query-log = 1
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slow-query-log-file = /var/log/mysqld/slow.log
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long-query-time = 8
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#log-queries-not-using-indexes = 1
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log-error = /var/log/mysqld/error.log
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pid-file = /var/run/mysqld/mysqld.pid
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max-connections = 1000
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max-connect-errors = 1000
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max-user-connections = 600
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interactive-timeout = 3600
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wait-timeout = 3600
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skip-name-resolve = 1
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lower-case-table-names = 1
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default-time-zone = '+08:00'
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character-set-server = utf8mb4
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sql-mode = NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
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bind-address = 0.0.0.0
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table-open-cache = 2048
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default-storage-engine = innodb
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innodb-autoinc-lock-mode = 2
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innodb-flush-log-at-trx-commit = 0
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# 建议物理内存一半
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innodb-buffer-pool-size = 8G
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innodb-buffer-pool-instances = 8
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max-allowed-packet = 512M
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query-cache-size = 0
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query-cache-type = 0
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# 建议点分 ip 的最后一个数字
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server-id = 123
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# bin log
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#binlog-format = ROW
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#log-bin = /var/lib/mysql/mysql-bin
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#expire-logs-days = 3
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# relay log
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#read-only = 1
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#replicate-wild-do-table = db1.%
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#relay-log = /var/lib/mysql/mysql-relay-bin
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#slave-parallel-type = logical-clock
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```
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## 复制表结构
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```sql
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create table db1.t1 like db2.t2;
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create table db1.t1 select db2.t2 where 1=2;
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```
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```sql
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create table db1.t1 like db2.t2;
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create table db1.t1 select db2.t2 where 1=2;
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```
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## 复制表结构及其数据
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```sql
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create table db1.t1 select db2.t2 [where ...]
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```
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```sql
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create table db1.t1 select db2.t2 [where ...]
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```
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## 复制表数据
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```
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insert into db2.t2(column1, column2 ...)
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select column1, column2 ... from db1.t1 [where ...]
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```
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```
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insert into db2.t2(column1, column2 ...)
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select column1, column2 ... from db1.t1 [where ...]
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```
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## 通过复制表文件来复制表数据
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- 在db2中创建同结构表
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@@ -98,45 +98,45 @@ categories: ["database"]
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```
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## 设置一个表的空列自增
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```sql
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-- 删除可能存在的主键
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alter table 表名 drop primary key;
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alter table 表名 modify 列名 auto_increment primary key;
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```
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```sql
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-- 删除可能存在的主键
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alter table 表名 drop primary key;
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alter table 表名 modify 列名 auto_increment primary key;
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```
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## 查看数据库中每个表的全部列名
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```sql
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select table_name, column_name from
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information_schema.columns
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where table_schema = '数据库名';
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```
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```sql
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select table_name, column_name from
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information_schema.columns
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where table_schema = '数据库名';
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```
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## 查看数据库中每个表的行数
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```sql
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select table_name, table_rows
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from information_schema.tables
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where table_schema = '数据库名';
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```
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```sql
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select table_name, table_rows
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from information_schema.tables
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where table_schema = '数据库名';
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```
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## 查看数据库中每个表的索引
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```sql
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select table_name, column_name, index_name
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from INFORMATION_SCHEMA.STATISTICS
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where table_schema = '数据库名';
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```
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```sql
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select table_name, column_name, index_name
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from INFORMATION_SCHEMA.STATISTICS
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where table_schema = '数据库名';
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```
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## 表的部分列数据到另一个表
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```sql
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update db2.t2(column1, column2 ...) = (
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select column1, column2 from db1.t1
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where db1.t1.id = db2.t2.id);
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```
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```sql
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update db2.t2(column1, column2 ...) = (
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select column1, column2 from db1.t1
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where db1.t1.id = db2.t2.id);
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```
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## 把语句执行结果写到文件
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```bash
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mysql -uroot -p -hsever_ip -Ddb_name
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-Ne "select ... from table_name;" > file_name
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```
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```bash
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mysql -uroot -p -hsever_ip -Ddb_name
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-Ne "select ... from table_name;" > file_name
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```
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## 表分区
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- 查看表的分区情况
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@@ -210,47 +210,47 @@ categories: ["database"]
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```
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## MySQL 5.7 从库多线程同步
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```sql
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stop slave;
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set global slave_parallel_type='logical_clock';
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set global slave_parallel_workers=4;
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start slave;
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show processlist;
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```
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```sql
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stop slave;
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set global slave_parallel_type='logical_clock';
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set global slave_parallel_workers=4;
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start slave;
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show processlist;
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```
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## MySQL 5.7 提示密码复杂度不够
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```sql
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set global validate_password_policy=0;
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```
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```sql
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set global validate_password_policy=0;
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```
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## MySQL 5.7 从库复制失败跳过指定数量的事务
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```sql
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stop slave;
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-- 跳过一个事务
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SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
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start slave;
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-- 修改 my.cnf
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slave-skip-errors=1062,1053,1146,1032 #跳过指定error no类型的错误
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slave-skip-errors=all #跳过所有错误
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```
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```sql
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stop slave;
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-- 跳过一个事务
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SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
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start slave;
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-- 修改 my.cnf
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slave-skip-errors=1062,1053,1146,1032 #跳过指定error no类型的错误
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slave-skip-errors=all #跳过所有错误
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```
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## MySQL 5.7 查看全部任务
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```sql
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-- 分号换成 \G 显示完整 sql
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show processlist;
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show full processlist;
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SELECT command FROM information_schema.processlist;
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```
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```sql
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-- 分号换成 \G 显示完整 sql
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show processlist;
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show full processlist;
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SELECT command FROM information_schema.processlist;
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```
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## MySQL 5.7 ssl 连接
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```
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--ssl-mode=REQUIRED
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```
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```
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--ssl-mode=REQUIRED
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```
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## MariaDB 10.1 修改密码
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```sql
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UPDATE user SET password=password('newpassword') WHERE user='root';
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```
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```sql
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UPDATE user SET password=password('newpassword') WHERE user='root';
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```
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## MySQL 5.7 编码
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- 查看
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@@ -272,9 +272,9 @@ categories: ["database"]
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```
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## MySQL 5.7 升级数据库管理表结构
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```bash
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mysql_upgrade -u root -p
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```
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```bash
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mysql_upgrade -u root -p
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```
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## MySQL 5.7 误删 root 后恢复 root 账户
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- 停止 mysql 服务
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@@ -385,10 +385,10 @@ categories: ["database"]
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- Using Flesort 依靠索引顺序达不到排序效果，需额外排序
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## 统计 insert、delete、update 和 select 次数
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```sql
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show global status where Variable_name in
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('com_insert', 'com_delete', 'com_update', 'com_select');
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```
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```sql
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show global status where Variable_name in
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('com_insert', 'com_delete', 'com_update', 'com_select');
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```
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## csv 文件
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- 导出
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Reference in New Issue
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