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MySQL versions, for the Add index processing is different, there are three main types: (1) Copy table methodThis is the earliest supported way to create an index INNODB. As the name suggests, creating indexes is done through temporary table copies.

The first requirement is to do a display of online user nicknames and online numbers. Then the personal idea is to make a field in the user table to mark the user online (1) or not online (0), when the user logs on the setting of this field is 1,

Many new users are following the online shopping spree and are constantly switching online, but they do not have a clear idea of their future development path. In the end, I only get some rebates, some of them don't get any rebates, and I don't

1. My dad helped me with online banking. When I used it, I found that the verification information was "Daughter, please work hard !"　　2. Mom said, "when I miss you, I will go shopping alone, imagining what the beautiful clothes look like on my

I believe that every Webmaster will never understand the website, and a lot of knowledge will be available from nothing, and the traffic on your website will also be less to more, and the website theme will not remain unchanged, I also believe that

Principles and Application of pt-online-schema-change, ptonlinechangeschema If it is reprinted, please indicate the source of the blog: www.cnblogs.com/xinysu/. The copyright belongs to xiaoradish in the blog garden. Thank you for your

Business 0 Impact! How to skillfully use MySQL traditional replication technology in online environmentThis article I will not describe how to deploy a MySQL replication environment or keepalived+ dual-host environment, because this kind of

How can php read PDF files online? I am working on a small website, where I want to read PDF files (magazines) online. the file sizes are different. some have around 15 MB and some have around 4 MB. how can I achieve this? Could you please give me