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mysql blob大小配置介绍 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...理器（如数据库管理器）不去理会文件是什么，而是关心如何去处理它。但也有专家强调，这种处理大数据对象的方法是把双刃剑，它有可能引发一些问题，如存储的二进制文件过大，会使数据库的性能下降。在数据库中存放体...
PDOException SQLSTATE[HY000] [2002] No such file or directory
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The error message indicates that a MySQL connection via socket is tried (which is not supported).
In the context of Laravel (artisan), you probably want to use a different / the correct environment. Eg: php artisan migrate --env=production (or whatever enviro...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...综合考虑各种因素（是否满足高并发高性能，Session保持如何解决，负载均衡的算法如何，支持压缩，缓存的内存消耗）；下面基于几种常用的负载均衡软件做个介绍。
LVS，工作在4层，Linux实现的高性能高并发、可伸缩性、可靠...
How to shrink/purge ibdata1 file in MySQL
I am using MySQL in localhost as a "query tool" for performing statistics in R, that is, everytime I run a R script, I create a new database (A), create a new table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A.
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MySQL show status - active or total connections?
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Connections
The number of connection attempts (successful or not) to the MySQL server.
You can see the number of active connections either through the Threads_connected status variable:
Threads_connected
The number of currently open connections.
mysql> show status where `variable_name` = 'Th...
SQL中使用update inner join和delete inner join；Oracle delete join替代...
...here and table1.khid=table2.khid and FWDWID=8);
Oracle的delete与join如何使用
delete from A where sid in
(select a.sid from A a inner join B b on a.num2 = b.num1
where b.num2 not between '10'and '10000') 这段sql如何优化，不使用in？
1. 用exists 来替代 in
delete fr...
MySQL INNER JOIN select only one row from second table
I have a users table and a payments table, for each user, those of which have payments, may have multiple associated payments in the payments table. I would like to select all users who have payments, but only select their latest payment. I'm trying this SQL but i've never tried nested SQL sta...
How can I import a database with MySQL from terminal?
How can I import a database with mysql from terminal?
18 Answers
18
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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...于它对内存的贪得无厌，至于个中缘由，我先讲讲Linux是如何管理内存的，再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人，无不惊讶于它对内存的贪得无厌，至于个中缘由，我先讲讲Linux是如何管理内存的，再说说MongoD...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...于它对内存的贪得无厌，至于个中缘由，我先讲讲Linux是如何管理内存的，再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人，无不惊讶于它对内存的贪得无厌，至于个中缘由，我先讲讲Linux是如何管理内存的，再说说MongoD...