SQL> create table system.test(name char(10)); Table created. SQL> insert into test values(‘scott’); 1 row created. SQL> insert into system.test values(‘system’); 1 row created. SQL> commit; Commit complete. SQL> conn system/manager Connected. SQL> select * from test; NAME ——...
细分了每个表的增删改查的执行次数,总等待时间,最小、最大、平均等待时间,甚至精细到某个索引的增删改查的等待时间,表IO等待和锁等待事件instruments(wait/io/table/sql/handler和wait/lock/table/sql/handler )默认开启,在setup_consumers表中无具体的对应配置,默认表IO等待和锁等待事件统计表中就会统计相关事件...
information_schema.STATISTICS 对应于show index from table_name 查看线程 information_schema.PROCESSLIST 对应于 show processlist 二.MySQL 库表简介 在mysql数据库中,有mysql_install_db脚本初始化权限表,存储权限的表有:1、user表: 用户列、权限列、安全列、资源控制列2、db表 : 用户列、权限列3、host表4、t...
1在标准SQL中,建立视图的命令是___。 A.CREATE SCHEMA命令B.CREATE TABLE命令C.CREATE VIEW命令D.CREATE INDEX命令 2在标准SQL中,建立视图的命令是___。 A.CREATESCHEMA命令B.CREATETABLE命令C.CREATEVIEW命令D.CREATEINDEX命令 3在标准SQL中,建立视图的命令是 ___。 A.CREATE SCHEMA命令B.CREATE TABLE命令...
SELECT CONCAT("mysqldump -uroot -p123 ",table_schema," ",table_name," >/tmp/",table_schema,"_",table_name,".sql") FROM information_schema.tables WHERE table_schema NOT IN('sys','performance','information_schema') INTO OUTFILE '/tmp/bak.sh'; ...
WHERE table_schema = 'University' AND table_name = 'Student' ) as table_exist; MySQL adheres to the ANSI Standard by storing the database name in thetable_schemacolumn withininformation_schema.tables.Similar to PostgreSQL and SQL Server, the outcome of the above query depends on user permi...
在SQL中,删除视图用___。 A. DROP SCHEMA命令 B. CREATE TABLE命令 C. DROP VIEW命令 D. DROP INDEX命令 相关知识点: 试题来源: 解析 C 正确答案:C 解析:本题的正确答案是C,命令是DROP VIEW。选项A中命令的含义是删除某个模式;选项B中的命令含义是创建表;选项D中命令的含义是删除某个表上建立的索引。
SQL> create user storm identified by storm; User created. SQL> create user penguin identified by penguin; User created. 第二步,赋予一些基本的权限给新建的用户storm和penguin: SQL> grant connect,create table,resource to storm,penguin; Grant succeeded. ...
For queries that refer to certainINFORMATION_SCHEMAtable columns, several optimizations are available that minimize the number of table files that must be opened. Example: In this case, after the server has scanned the database directory to determine the names of the tables in the database, th...
dictionary. Traditionally, you would get this type of information using the techniques fromSection 17.17, “InnoDB Monitors”, setting upInnoDBmonitors and parsing the output from theSHOW ENGINE INNODB STATUSstatement. TheInnoDBINFORMATION_SCHEMAtable interface allows you to query this data using SQL. ...