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  Why (offset, limit) is slow in database select?

Starting from a problem Five years ago when I was working at Tencent, I found that MySQL request speed was very slow in the pagination scenario. With only 100,000 data, a select query on a single machine took about 2-3 seconds. I asked my mentor why, and he asked in return, "In an indexing scenario, what is the time complexity to get the nth largest number in MySQL?" The pursuit of the answer Confirming the scenario Assuming there is an index on the "status" column, a query like "select * from t...

   SLOW,LIMIT,OFFSET,MYSQL     2023-03-12 05:21:02

  Install and use GSpace to install apps from Google Play on Huawei Harmony OS

Huawei has released its own branded mobile OS Harmony OS sometime back and some Huawei device models now support installing or upgrading to use Harmony OS. Since this OS is Huawei's own OS and it doesn't come with Google Play by default which most of the current Android apps are hosted on. In this case, how can someone install the apps from Google Play on Huawei Harmony OS or use GMS services like Google Play, Google Maps? The solution provided by Huawei is to install GSpace which is an APP cont...

   HUAWEI,GOOGLE PLAY,HARMONYOS     2021-08-01 04:23:58

  Certificate is invalid for localhost in Chrome

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   CHROME,LOCALHOST,HTTPS,CERTIFICATE,ELASTICSEARCH     2022-03-16 08:21:27

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