Vacuuming Firefox’s sqlite3 databases

Porges — Sun, 16 Nov 2008 23:56:39 +0000

Firefox 3 was running very slow for me, so I desperately tried this, thinking that it wouldn’t make much difference. I was wrong; there was a noticeable speed improvement. From a bash shell:

find ~/.mozilla -iname '*.sqlite' -execdir sqlite3 {} 'vacuum;' \;

object.Equals handles null values correctly

Porges — Thu, 27 Mar 2008 20:58:12 +0000

Here’s the source code, as disassembled by Reflector:

public static bool Equals(object objA, object objB)
{
    return ((objA == objB) || (((objA != null) && (objB != null)) && objA.Equals(objB)));
}

It seems that not even Microsoft knows this! I spotted this code, from ASP.NET’s MVC implementation, on Scott Hanselman’s blog:

return (other != null) &&
  (((other._first == null) && (_first == null)) ||
    ((other._first != null) && other._first.Equals(_first))) &&
  (((other._second == null) && (_second == null)) ||
    ((other._second != null) && other._second.Equals(_second)));

This can be rewritten as:

return (other != null) &&
  object.Equals(other._first, _first) &&
  object.Equals(other._second, _second);

Much nicer!

porges » snippets

Vacuuming Firefox’s sqlite3 databases

object.Equals handles null values correctly