Then shrink MsSQL db and now it is 500mb. What is the reason behind this huge difference? Why MsSQL db with same data has 2x more space in hdd? Subject Written By Posted MsSQL db has 2xMySQL size (even the datas are the same) ...
SELECT UUID();//c2cb8f66-351f-11e7-b3ed-00163e0429b6SELECT REPLACE(UUID(), '-', '');//将'-'替换掉 在MySQL 的 UUID() 函数中,前三组数字从时间戳中生成,第四组数字暂时保持时间戳的唯一性, 第五组数字是一个 IEEE 802 节点标点值,保证空间唯一。 使用UUID() 函数,可以生成时间、空间上都...
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Description: We run the following SQLs and we see inconsistent behaviors when some of column alias names, column names are the same: Output: mysql> drop table if exists t1; ate table t1(c1 int, c2 int); Query OK, 0 rows affected (0.01 sec) mysql> create table t1(c1 int, c2 int)...
* Clients wishing to avoid the aforementioned race condition MAY use new syntax that submits both connection ID and connect-timestamp, either as KILL STARTED AT or the equivalent mysql_kill_safe(MYSQL *, id, timestamp) * This will uniquely identify or current or historic connection throughout...
Error Code:1175. You areusingsafe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the optioninPreferences -> SQL Queries and reconnect. 这是因为MySQL运行在safe-updates模式下,该模式会导致非主键条件下无法执行update或者delete命令。
In MySQL 8.1 we have made some changes to prepare for the day that MySQL 10 is released. Have you verified thatyourapplications are ready for MySQL 10? Let's have a look at what we've done in MySQL Server to prepare for this, and what you can and should do to future proof your ap...
The features are enlisted below: MySQL is one of the first open-source databases. It is an RDBMS (RelationalDatabaseManagementSystem). Data can be stored and accessed across multiple storage engines. It supports SQL (StructuredQueryLanguage) commands and hence, there is no need to learn any lan...
MySQL 8.0.35, it run quickly as your case I think if the system has a large number of tables it may have problems. Another things, I check the explanation of query and I don't know why they are different between MySQL 8.0.20 and MySQL 8.0.35 (same query command, same database ...
parentID CHAR(1) NOT NULL, PRIMARY KEY(childID,parentID) ); How do I delete the edges entry when a node is deleted? Right now it yields errors. For example, doing a delete from nodes gives me: SQLSTATE[HY000]: General error: 1030 Got error -1 from storage engine.Navigate...