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tablespace - MySQL從5.5升級到5.7后innodb_file_per_table默認開啟問題

最近將數(shù)據(jù)庫從庫從5.5升級到5.7,發(fā)現(xiàn)儲存MySQL磁盤空間一下子占用變大了很多，排查了一下發(fā)現(xiàn)是升級后MySQL的系統(tǒng)表空間(ibdata1)很大[原本就很大],單個innodb表的表空間也變得很大[升級后變大]，...

From [MySQLdiscussion group] 2017-04-17 15:30:18 0  1  858

Python/MySQL cannot persist integer data correctly

No code is required here. I want to save a very long number because I'm making a game and need to save scores....

From [MySQLdiscussion group] 2024-04-04 19:09:44 0  1  857

How can I adjust the timeout for a MySQL query run by PowerShell to allow more than 30 seconds to run?

I have a MySQLSELECT query that takes a few minutes when run in SQLyog (the GUI I use). When I try to run the ...

From [MySQLdiscussion group] 2023-09-10 13:18:46 0  1  857

mysql - sql動態(tài)列的問題？

如下表province_name province_code city_name city_code country_name contry_code北京 110000 北京 110000 東城 110101天津 120...

From [MySQLdiscussion group] 2017-04-17 13:23:50 0  1  857

mysql - 數(shù)據(jù)庫命名規(guī)范？

看老師給的文檔，數(shù)據(jù)庫命名很亂，有sname這樣的，又有t_sex這樣的。在網(wǎng)上查數(shù)據(jù)庫的命名規(guī)范，有說要用Pascal命名法的，有說用下劃線的，還有的說列名一律采用“TeacherName”“TeacherID”這種，...

From [MySQLdiscussion group] 2017-04-17 13:02:39 0  2  857

How to change records to system time in MySQL?

How to change Zhang San’s time to system time?

From [MySQLdiscussion group] 2017-05-19 10:07:26 0  1  856

MySQL - Trigger to update the same table after insert operation

Here's what I'm trying to do: When there is a new INSERT into table ACCOUNTS, I need to update the row in ACCO...

From [MySQLdiscussion group] 2023-10-16 20:01:46 0  2  855

Does anyone know how to modify data in multiple rows and columns in MySql? Please give me some advice.

Does anyone know how to modify data in multiple rows and columns in MySql?

From [MySQLdiscussion group] 2017-06-06 09:51:59 0  5  855

mysql - Why does the database need a lock mechanism?

Why does the database need a lock mechanism? Can you give a detailed example using code? Thank you!

From [MySQLdiscussion group] 2017-05-18 10:54:59 0  3  855

The rephrased title is: MySQL table name using double quotes

I'm executing a mysql query like this: Select*from "User"; it returns: There is an error in your SQL...

From [MySQLdiscussion group] 2023-10-24 22:39:00 0  1  854

Undefined constant 'text' in /home/jokebo/public_html/index.php:23

I have a PHP project that connects to a SQL database. The problem is that I cannot access the value of text in...

From [MySQLdiscussion group] 2023-09-16 16:33:51 0  1  854

數(shù)據(jù)庫設(shè)計 - web項目，mysql數(shù)據(jù)庫只會增刪改查，應(yīng)該怎樣提高？有沒有書籍推薦？

感覺就會將數(shù)據(jù)通過php來進行增刪改查，不知道在一個web項目中具體怎樣來設(shè)計數(shù)據(jù)庫，根據(jù)網(wǎng)站的功能，應(yīng)該設(shè)計多少個表這樣的。比如我要實現(xiàn)對于一篇文章添加標簽這樣的功能（像本站這樣的），應(yīng)該怎樣設(shè)計數(shù)據(jù)...

From [MySQLdiscussion group] 2017-04-17 11:55:28 0  2  854

Mysql 更新數(shù)據(jù)時間不穩(wěn)定

如圖，一條同樣的SQL語句，有些執(zhí)行160多ms，有些執(zhí)行50ms。 有什么因素會造成這么不穩(wěn)定的查詢時間呢？ID 是主鍵。 查詢和更新的頻率為2：1。沒有鎖表的語句。

From [MySQLdiscussion group] 2016-11-07 14:37:44 0  1  854

MySQL multi-expression if statement

I want to execute multiple expressions in an if statement in a select statement like this: SELECTt.id,IF(id>...

From [MySQLdiscussion group] 2023-09-19 16:06:52 0  1  853

Arrangement problem after mysql query

There are two tables, table1 and table2. The questions are as follows: {Code...} Maybe my description is not c...

From [MySQLdiscussion group] 2017-06-28 09:23:42 0  3  853