alter table emp drop partition p1; 不可以删除hash或者key分区。 alter table emp drop partition p1,p2; 增加分区: alter table emp add partition (partition p3 values less than (4000)); alter table empl add partition (partition p3 values in (40)); 分解分区: Reorganizepartition关键字可以对表的部...
2、显示库中的数据表: use mysql; //打开库 show tables; 3、显示数据表的结构: describe 表名; 4、建库: create database 库名; 5、建表: use 库名; create table 表名(字段设定列表); 6、删库和删表: drop database 库名; drop table 表名; 7、将表中记录清空: delete from 表名; 8、显示...
RECORD LOCKS space id 28 page no 4 n bits 80 index num_index of table `test`.`dl` trx id 47631331 lock mode S waiting *** (2) TRANSACTION: TRANSACTION 47631326, ACTIVE 22 sec inserting, thread declared inside InnoDB 5000 mysql tables in use 1, locked 1 3 lock struct(s), heap siz...
1、导致崩溃的 SQL 语句为:SELECT DISTINCT T.CUST_NO FROM testDB.TABLE_TRANSACTION T WHERE EXISTS (SELECT 1 FROM testDB.Table1 T1 WHERE T.CUST_NO = T1.CUST_NO ) AND T.AGENT_CERT_NO IS NOT NULL 2、数据库发出的信号为 signal 11 ,即是 MySQL 访问到了一个错误的内存地址。 分析过程 1、...
(1).DDL语句(其中有truncate table)。 (2).隐式修改mysql数据库架构的操作:create user,drop user,grant,rename user,revoke,set password。 (3).管理语句:analyze table、cache index、check table、load index into cache、optimize table、repair table。
mysql tables inuse 1, locked 1 LOCK WAIT 2lock struct(s), heap size 360, 1 row lock(s) delete fromtest2 where id =20 --- TRX HASBEEN WAITING 2 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKSspace id 13379 page no 4 n bits 80 index `idx_id` of table `test`.`test2` trxid ...
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选择表的子菜单并右键单击它以选择 “Create Table” 选项。或者,你可以在创建schema菜单后从主工具栏创建一个新表。 MySQL 创建表 新表屏幕打开后,你必须填写所有详细信息。例如,在表中输入表名(PyDataStudio_authors),然后使用默认引擎和排序规则。 在中间窗口内单击,填写列详细信息。列名始终包含主键 (PK)、唯一...
For queries that use theSQL_SMALL_RESULTmodifier, MySQL uses an in-memory temporary table, unless the query also contains elements (described later) that require on-disk storage. To evaluateINSERT ... SELECTstatements that select from and insert into the same table, MySQL creates an internal te...
show open tables where In_use>0; #2.使用如下命令分析表锁。 show status like 'table%'; 主要注意两个变量的值: ①Table_locks_immediate:产生表级锁定的次数,表示可立即获取锁的查询次数,每立即获取锁一次该值加1。 ②Table_locks_waited:出现表级锁定争用而发生等待的次数(不能立即获取锁的次数,每等待...