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Questions on MySQL connections

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    Questions on MySQL connections

    I've been working with Alpha software for over 5 years. I am well versed in the application. Recently, I started looking into optimizing my database trying to make queries quicker. I run MariaDB 10, a popular and binary compatible fork of MySQL. But the following will apply to MySQL as well. (Alpha doesn't even know the difference between the two, uses the exact same connection string). Anyways, I turned on Query logging and took a look at some statistics of queries run. Over 50% of my queries are SET option queries.

    Code:
     5639 Connect    root@localhost as anonymous on baltimore
     5639 Query    SET character_set_results=utf8
     5639 Query    SET character_set_client=utf8
     5639 Query    SELECT DISTINCT name, id FROM cs_territories  WHERE id > 0  ORDER BY id, name
     5639 Quit
    It looks like there are at least 3 queries that are run on every single connection to the database:
    1) Sets character_set_results to utf8
    2) Sets character_set_client to utf8
    3...N) Runs selected queries and finally, closes the connection.

    First: utf8 is actually feature incomplete on MySQL. If you want utf8, then you should be using utf8mb4. (See: https://mathiasbynens.be/notes/mysql-utf8mb4). So if Alpha software is trying to get full utf8 support from MySQL, it's missing the mark.

    Second: If that is the case, a single query would suffice. SET character_set_results=utf8, character_set_client=utf8.

    Third: My database is already setup to properly support utf8. So these two queries don't actually change anything.

    Suggestion: Add something in the connection string that tells Alpha that my database is already encoded in utf8, then be able to skip those two queries in each connection.
    Second suggestion: If that can't be done, at least combine them into a single query.

    Caveat: I know we're talking about thousandth's of a second with the SET queries. Sure it adds up over millions of connections, probably to something insignificant, but it would lower I/O on my server. At the most, this might reduce the number of queries down 2/3rds.

    Thanks for listening

    #2
    Re: Questions on MySQL connections

    I'm certain Alpha would be interested in your observation you should report it. - Good job.
    Insanity: doing the same thing over and over again and expecting different results.
    Albert Einstein, (attributed)
    US (German-born) physicist (1879 - 1955)

    Comment


      #3
      Re: Questions on MySQL connections

      From Selwyn:

      thanks for the email. this is not something that we plan to address in the short term.

      i asked the lead developer on AlphaDAO for comments. here is what he told me

      We are using very old MySQL client driver code and need to support backward compatibility, so this is not as simple an issue as it sounds.
      o Without testing, I don’t know if multiple queries in the form he is suggesting are supported in the current driver client code.
      o I would have to confirm that the utf8mb4 support he is looking for is even supported on the client we are using. utf8mb4 was introduced in MySQL 5.5.3.
      o We also need to be sure that the 4 byte UTF format is supported in web pages.
      o At some point we can introduce support for newer clients, but will need create another driver linking to a separate DLL (and redistribute it as well) for newer clients.


      You might want to try using ADO.NET to connect to your MySQL database, or possibly even ODBC, rather than the built in MySQL driver to see if that gives you what you want.
      If I get a chance to do some testing with one of the other ways to connect to my database, I'll post back here.

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