应用程序会向MySQL发起SELECT、UPDATE等操作,处理这些请求花费多久很关键,甚至还想知道具体是哪个SQL最慢,这样就可以有针对性地调优。 1.1.1 采集延迟数据 在客户端埋点 上层业务程序在请求MySQL的时候,记录每个SQL请求耗时,把这些数据统一推给监控系统,监控系统就可以计算出平均延迟、95分位、99分位的延迟数据了。要...
Mysql doesn't return number of affected rows as a return value from insert. Basically you know that the number of rows is exactly as many as you did try to insert in case if insert is a success. If not zero rows are affected. elhigu closed this as completed Feb 5, 2019 patrick-m...
mysql> update test set a1=10, a2=3.33333, a3=now(), a4=now(), a5='abcde', a6='a', a7='s' where a1=1; Query OK, 1 row affected (0.06 sec) Rows matched:1 Changed: 1 Warnings: 0 mysql> delete from test; Query OK, 1 row affected (0.04 sec) mysql> drop table test; Query...
mysql>update mysql.usersetpassword=password('123456')where User='root';Query OK,4rows affected(0.00sec)Rows matched:4Changed:4Warnings:0mysql>flush privileges;Query OK,0rows affected(0.00sec) 1. 2. 3. 4. 5. 6. 7. 上面就为root用户创建了密码`123456`。 执行完之后再查看一下当前的账户信息...
{$sql= "UPDATE users SET PASSWORD='$pass' where username='$username' and password='$curr_pass'";$res=mysql_query($sql) ordie('You tried to be smart, Try harder!!! :( ');$row=mysql_affected_rows();echo'';echo'';if($row==1) {echo"Password successfully updated"; } 修改密码...
MariaDB>CREATEUSER'tux'@'localhost'IDENTIFIED BY'Example123';Query OK,0rows affected(0.012sec) If you're still logged in as root, typeexitto leave the MariaDB prompt. Now that you have a user identity with the database, you can access it as a regular user, but only locally. The synt...
Description:Output: === mysql> create table t1(c1 bigint unsigned); rt into t1 values(-2); Query OK, 0 rows affected (0.01 sec) mysql> insert into t1 values(-2); ERROR 1264 (22003): Out of range value for column 'c1' at row 1 mysql> show warnings; +---+---+---+ | Lev...
sec) mysql> alter table foo drop index `xjk`; Query OK, 640 rows affected (0.01 sec) Records: 640 Duplicates: 0 Warnings: 0 mysql> alter table foo add index `xjk` (`j`,`k`) using btree; Query OK, 640 rows affected (0.00 sec) Records: 640 Duplicates: 0 Warnings: 0 mysql> ...
mysql_affected_rows() mysql_autocommit() mysql_change_user() mysql_character_set_name() mysql_client_find_plugin() mysql_client_register_plugin() mysql_close() mysql_commit() mysql_connect() mysql_create_db() mysql_data_seek() mysql_debug() mysql_drop_db() mysql_dump_debug_info() mysq...
Query OK, 0 rows affected mysql> select * from user where id=1 lock in share mode;; +---+---+---+---+ | id | name | age | registerTime | +---+---+---+---+ | 1 | jack | 23 | NULL | +---+---+---+