Query OK, 0 rows affected (0.15 sec) mysql> insert into t11(name) values('Jack'),('Tom'),('Mark'),('Black'); Query OK, 4 rows affected (0.06 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> create table t12(id int primary key auto_increment,name char(20)); Query OK, 0 ro...
--需要归档的数据量mysql admin@192.168.58.3:employees>selectcount(*)fromemployeeswherefirst_name='Anneke';+---+|count(*)|+---+|225|+---+1rowinsetTime:0.025s--执行归档操作# pt-archiver--source h=192.168.58.3,P=3306,u=admin,D=employees,t=employees,A=utf8 --dest h=192.168.58.3,P=3...
Query OK, 0 rows affected (0.00 sec) ---TRANSACTION 146831, ACTIVE 24 sec 2 lock struct(s), heap size 360, 1 row lock(s) MySQL thread id 1, OS thread handle 0x7f61ab1c7700, query id 881 localhost msandbox cleaning up TABLE LOCK table `test`.`tu` trx id 146831 lock mode IX ...
This deletes all rows from the table namedtbl_namein the database nameddb_name. It is exactly equivalent to executingTRUNCATEdb_name.tbl_namein MySQL. Options that can be used withndb_delete_allare shown in the following table. Additional descriptions follow the table. ...
我们发现union all 的所用的 type【type为显示连接使用了何种类型】 为ref 而or和in为range【ref连接类型优于range,相差不了多少】,而查询行数都一样【看rows字段都是为3】。 从整个的过程来看,在索引列使用常数or及in和union all查询相差不了多少。
I want to delete row in 'Play Table' by Id, and want to update 'Game Table' by the GameId of 'Play Table' I can do this with seperate queries, but I want to do it at once. I tried but no luck. How can I do it?
mysql> select table_schema, -> table_name,ENGINE, -> round(DATA_LENGTH/1024/1024+ INDEX_LENGTH/1024/1024) total_mb,TABLE_ROWS, -> round(DATA_LENGTH/1024/1024) data_mb, round(INDEX_LENGTH/1024/1024) index_mb, round(DATA_FREE/1024/1024) free_mb, round(DATA_FREE/DATA_LENGTH*100,2)...
mysql>create tableundo_demo(->id int notnull,->key1varchar(100),->colvarchar(100),->primarykey(id),->keyidx_key1(key1)->);QueryOK,0rowsaffected(0.05sec) 表中id主键,key1是二级索引,col是普通列。我们前面说过每个表都有一个唯一的table id,在information_Shcema中的innodb_sys_tables。
TRANSACTION 272174, ACTIVE 0 sec fetching rows mysql tables in use 1, locked 1 LOCK WAIT 18 lock struct(s), heap size 1136, 58 row lock(s), undo log entries 41 MySQL thread id 298, OS thread handle 140425685493504, query id 5479767 172.18.70.114 root updating ...
mysql> show table status like 't_user'G *** 1. row *** Name: t_user Engine: InnoDB Version: 10 Row_format: Dynamic Rows: 4333 Avg_row_length: 589 Data_length: 2555904 Max_data_length: 0 Index_length: 2719744 Data_free: 4194304 Auto_increment: NULL Create_time: 2021-11-19 ...