Re: New command suggestion (was Re: Modifying databasesmanually)

This WebDNA talk-list message is from

1997

It keeps the original formatting. numero = 13829
interpreted = N
texte = >Changing out databases has become a problem for us, since we generally have>20 or more connections at any given time. I hate to deny users access to>our site by quitting Webstar or Refusing Connections for ANY amount of>time, so I have a proposal.>>A new command called $Reload with the argument db=file.db. This command>would cause Webcat to throw away the database in RAM and reload the data>from disk.In other words, what you really would like to have is a new tag thatpurges the xxx.db data from RAM *without* writing it to disk. Yes,that would make it possible to do everything you need, automatically,in a single template like this:[CloseDatabase xxx.db][AppleScript]Move the xxx.db file to the trash and rename the xxx.db copy fileto xxx.db[/AppleScript][PurgeDatabase xxx.db]It won't make any difference how many people are searching thexxx.db while the AppleScript is working, because they will beworking off a RAM-cached version of the original database anyways, atleast until WebCat receives an [append] or [closedatabase] or[flushdatabases] or [PurgeDatabase] command.And once the AppleScript is done working and the data is purged fromRAM with the [PurgeDatabase] command, you really don't have to worryabout loading the new xxx.db into RAM, because it will be loadedautomatically into RAM the first time one of your templates needs todeal with that database again.And if you're really in a hurry to reload the new xxx.db file*before* one of your users has a chance to reload it, you can easilyput a [search] or a [lookup] after the [PurgeDatabase] tag, whichwill make the database reload immediately after being purged from RAM.It seems the critical function of this proposed tag should be simplyto purge the RAM without writing it to disk (thus my suggestedPurgeDatabase name). Everything else can be done with WebDNA'sexisting capabilities and with AppleScript.Sincerely, Ken GromeWebDNA Solutions808-737-6499http://www.hui.net/dna/webdna.html Associated Messages, from the most recent to the oldest:

>Changing out databases has become a problem for us, since we generally have>20 or more connections at any given time. I hate to deny users access to>our site by quitting Webstar or Refusing Connections for ANY amount of>time, so I have a proposal.>>A new command called $Reload with the argument db=file.db. This command>would cause Webcat to throw away the database in RAM and reload the data>from disk.In other words, what you really would like to have is a new tag thatpurges the xxx.db data from RAM *without* writing it to disk. Yes,that would make it possible to do everything you need, automatically,in a single template like this:[CloseDatabase xxx.db][AppleScript]Move the xxx.db file to the trash and rename the xxx.db copy fileto xxx.db[/AppleScript][PurgeDatabase xxx.db]It won't make any difference how many people are searching thexxx.db while the AppleScript is working, because they will beworking off a RAM-cached version of the original database anyways, atleast until WebCat receives an [append] or [closedatabase] or[flushdatabases] or [PurgeDatabase] command.And once the AppleScript is done working and the data is purged fromRAM with the [PurgeDatabase] command, you really don't have to worryabout loading the new xxx.db into RAM, because it will be loadedautomatically into RAM the first time one of your templates needs todeal with that database again.And if you're really in a hurry to reload the new xxx.db file*before* one of your users has a chance to reload it, you can easilyput a [search] or a [lookup] after the [PurgeDatabase] tag, whichwill make the database reload immediately after being purged from RAM.It seems the critical function of this proposed tag should be simplyto purge the RAM without writing it to disk (thus my suggestedPurgeDatabase name). Everything else can be done with WebDNA'sexisting capabilities and with AppleScript.Sincerely, Ken GromeWebDNA Solutions808-737-6499http://www.hui.net/dna/webdna.html Kenneth Grome

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