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After trying various things in various projects, here’s what has consistently worked best for me:   an SQLite database file, containing data stored in YAML format, all of which data is read-only.   (Modification is not allowed, because it would be impossible to keep all of the various persistent CGI-servers in sync.)

If you know that strings are likely to be used over and over again, especially in a persistent environment like mod_perl (or FastCGI), you might decide to maintain a small Cache (there are many flavors available, ready-made ...).  But the principle is the same:   most of the data is kept on disk, and demand-loaded, with a reasonable and adjustable cap on the number of entries that are allowed to be in memory at once.

I specified YAML because I have had “unexpected problems” that I could never quite explain with Storable.   (I’d store stuff and then be unable to get it back.)   So, I use this format, which also has the big advantage of being human-readable.   Note also that I am rarely dealing with “every microsecond counts” performance-laden situations, so Your Mileage May Vary.™


In reply to Re: Difference between a declared hash and stored one with storable. by sundialsvc4
in thread Difference between a declared hash and stored one with storable. by mohan2monks

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    [marto]: the ticketing system does not accept calls via email, nor has it a working API. It's tied into Active Directory for authentication and the Solaris boxes aren't on that domain
    [Corion]: The one thing I haven't figured out a solution to is how to get an edge-trigger instead of sending an email every 5 minutes if the usage is above 90%. I want one mail when it goes over 90% but no more emails as long as it stays between 90% and 95%.
    [Corion]: marto: Clever! ;)
    [Corion]: You can only reach me by pager
    [Corion]: Maybe the solution would be to launch a cron job every minute that takes two measurements a minute apart and sends a mail if the usage is below on the first and above threshold on the last measurement
    [marto]: that's essentially it :)
    [marto]: I think the long term solution would be to have sysadmins that do their job, so I don't have to do everything :P
    [marto]: they already have an entire BMC patrol system, which they disabled, because it was sending out spurious messages. So rather than fix the issue, or even find out what it was, they turned it off. No messages, can't be any problems, right?
    [Corion]: marto: But having open tickets / incidents increases the pressure on them ;) Of course, likely your contract / SLA specifies an upper limit for the number of incidents :-D
    [Corion]: marto: Ow ...

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