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Messages in a file - why? [message #7162]

Sat, 09 November 2002 00:59

KVentz

Messages: 65
Registered: November 2002
Location: Moscow, Russia

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I have found that FUD forum stores messages bodies separately from headers in a single text file and forum searches message by (start char, length) coordinates.

Why not to store messages bodies with headers in MySQL table? Was it made for productivity or something?

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Re: Messages in a file - why? [message #7163 is a reply to message #7162]

Sat, 09 November 2002 07:45

hackie

Messages: 177
Registered: January 2002

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Core Developer

KVentz wrote on Fri, 08 November 2002 19:59

It's a lot faster to store them in a file.. a WHOLE LOT faster...

cc intelligence.c -o intelligence
$ ./intelligence
Segmentation fault

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Re: Messages in a file - why? [message #7181 is a reply to message #7162]

Sat, 09 November 2002 20:21

Olliver

Messages: 443
Registered: March 2002

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KVentz schrieb am Sam, 09 November 2002 01:59

phpBB stores messages the way u described. The result is, that on high load the forum will become awfully slow, even if it would run with UNIX sockets. Saving messages into a file bypasses this restriction in favour of speed.
bye
Olliver

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Re: Messages in a file - why? [message #10768 is a reply to message #7181]

Mon, 09 June 2003 20:39

korebantic

Messages: 1
Registered: June 2003

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Junior Member

Olliver wrote on Sat, 09 November 2002 15:21

KVentz schrieb am Sam, 09 November 2002 01:59

Insanity...Insanity

Even so, going with flat files has some serious drawbacks. What happens if the file gets corrupted? I can see that is far more likely to happen than with MySQL, especially if the server were to crash in the middle of a write. Modern day RDBMS protect you somewhat from that sort of thing. What data do you have to prove that this approach runs faster than MySQL using domain sockets.

Also, we have a custom message board system. Using this flat file format makes conversion for us far more difficult. It's quite unfortunate you made this decision. PhpBB all of a sudden looks a whole lot more appealing...

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Re: Messages in a file - why? [message #10769 is a reply to message #10768]

Mon, 09 June 2003 20:59

Ilia

Messages: 13241
Registered: January 2002

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Senior Member
Administrator
Core Developer

Here you are wrong, MySQL in a default setup is fast because it does not sync data to disk right away and rather stores it in memory. A sudden system failure will result in a data loss.
The entire file is unlikely to be corrupted unless you start manually tinkering with it, at worse you could risk loosing a single message.

The data to proves it comes from numerous benchmarks conducted at the time of implementation of this solution. As far as conversion, I fail to see how this would cause any difficulties. As long as you use the fud_msg_edit->add() or fud_msg_edit->add_reply() methods the actual message creation & writing of the body will be handled by the forum internally.

FUDforum Core Developer

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