We are running Apache 2.0 server on FreeBSD. All of our Perl code is running with SpeedyCGI with a MySQL database. We have noticed that sometimes a database entry may take up to 2 hours before it shows up in the database. What we found was that an employee gets anxious and closes out the web browser before the transaction is complete. It seems like the Perl script is just hanging in limbo and then at some unspecified time interval in the future it finishes and completes the database entries. Basically the script inserts some data into the table, performs a select to retrieve some data to present some info on the screen and inserts some more data into the database. The user Xs out of the browser during the select stage and then hours later the second sets of inserts get processed. It seems very odd but I can't find any information about the relation between Apache and Speedy that controls what happens in this situation. It's almost like Speedy is waiting until someone tries to connect to it before it finishes completing.
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A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads), installed and started the daemon, and had a console window open.
After an hour or two of playing at the command …
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
Learn how to navigate the file tree with the shell.
Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…