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MySQL Conference Liveblogging: Optimizing MySQL For High Volume Data Logging Applications (Thursday 2:50PM)


Posted by Artem Russakovskii on April 17th, 2008 in Databases

  • the database
  • CPU
  • memory
  • IO
    • disk latency
    • network latency
  • slow queries
  • media size deployment example
    • 300 platforms (300 remote agents collecting data)
    • 2,100 servers
    • 21,000 services (10 services per server), sounds feasible
    • 468,000 metrics (20 metrics per service)
    • 28,800,000 metric data rows per day
    • larger deployments have a lot more of these (sounds crazy)
  • data
    • measurement_id
    • timestamp
    • value
    • primary key (timestamp, measurement_id)
  • data flow
    • 0

    MySQL Conference Liveblogging: MySQL Hidden Treasures (Thursday 11:55PM)


    Posted by Artem Russakovskii on April 17th, 2008 in Databases

    • Damien Seguy of Nexen Services presents
    • easiest session of all (phew, that's a relief)
    • clever SQL recipes
    • tweaking SQL queries
    • shows an example where SELECT is ORDERED by a column that is actually an enum.
    • an enum is both a string and a number
    • sorted by number
    • displayed as string
    • can be sorted by string if it's cast as string
  • compact column
    • compacts storage
    • faster to search
    • if (var)char is turned into enum, some space can be saved, shows example
  • random order
    • order by rand(1) – obviously
    • the integer parameter is actually a seed
    • really slow, also obviously, especially for larger tables because it has to order first, then apply rand() to the list
    • another solution is to add an

      • …

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