Tag：explain
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Time：2021-6-16
It’s a pity that the Wenchuan earthquake on May 12, 2008 took away a lot of lives. In order to express deep mourning for the victims, the State Council has decided that May 19-21, 2008 will be the national day of mourning. During this period, many websites changed their styles to “black, white and gray” […]
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Time：2021-3-9
brief introduction MySQL provides an explain command, which can analyze the select statement and output the detailed information of select execution for developers to optimize The use of the explain command is very simple. Just add explain before the select statement EXPLAIN SELECT * from user_info WHERE id < 300; get ready In order to […]
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Time：2020-7-13
In our daily work, we sometimes slow down the query to record some SQL statements that have been executed for a long time. Finding out these SQL statements does not mean that it is finished. Sometimes, we often use the command explain to check the execution plan of these SQL statements to see whether the […]
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Time：2020-4-16
Keyword Description: function management link can be explained in this add information website This time we’ll talk about WordPress link management. In every WordPress website, users will list some websites they often visit (mostly blogs). WordPress calls this blogroll, which is actually what we call friendship links. In the WordPress management background, blogroll is listed […]
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Time：2019-9-14
Install packages FreeBSD packages are currently packaged by. tgz. If you want to install a packages, you can use pkg_add, such as tgz for installing a joe: pkg_add joe-{version}.tgz Force installation of packagesBecause some packages have dependencies with other packages, those packages must be installed before they can be installed properly. If you need to […]
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Time：2019-9-13
Update INDEX Control Table 4.x is in / usr / ports / INDEX, 5.x is in / usr / ports / INDEX-5. INDEX is a control table comparing all dependent information of ports. If it is not updated for a long time, it will lead to the failure of ports control. Officials regularly update INDEX, […]
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Time：2019-8-29
Comparing OpenSSH with the new version of FreeBSD, we can’t record the password directly when connecting with SecureCRT as before. Instead, we need to verify it with key pairs. It’s more troublesome to input the password manually every time. Here’s a brief introduction to how to use SecureCRT to generate OpenSSH-approved keys. 1. Select Create […]
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Time：2019-6-20
Preface This article mainly introduces the relevant contents about index and explanation in MongoDB, and shares them for your reference and study. Let’s have a look at the detailed introduction. Mongodb index usage Effect Indexes can usually greatly improve queries. An index is a data structure that collects the values of a specific field of […]
