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À
26/06/2007 09:06:53
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Titre:
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Network:
Windows 2000 Server
Database:
Visual FoxPro
Divers
Thread ID:
01235494
Message ID:
01235639
Vues:
12
One query is for example:
SELECT	ti.tiKey, ;
	ti.tiNumber, ;
	ti.tiTickNr, ;
	ti.tittKey, ;
	ti.tiValue, ;
	ti.tiBBOPerc, ;
	ac.acDate, ;
	ac.acTime, ;
	ac.acCreateT, ;
	ac.acMovieNam, ;
	ac.acmoKey, ;
	ac.acPrice, ;
	ac.acTyKey, ;
	ac.acRaKey, ;
	ac.acThKey, ;
	ac.actekey ;
	FROM Tickets ti ;
	LEFT OUTER JOIN ActShows ac ;
		ON ti.tiackey = ac.acKey ;
	WHERE ti.tiTrkey = tnBatchNr ;
	INTO CURSOR cuPrint1 NOFILTER
and that could return for example 4 records (if you bought four tickets)

>Are you using SELECT statements for your queries?
>
>
>
>>In very simplified form:
>>
>>USE actshows
>>=SEEK(lnCurrentShow,"ActShows","acKey")
>>Select * from ActShows WHERE acDate = DATE() INTO CURSOR cuTodayShows
>>
>>etc.
>>
>>When updating records, I also do record locks where necessary.
>>
>>Usually updating like this:
>>Insert into Tickets (tiKey, tinumber etc) VALUE (1,1, etc)
>>FLUSH IN Tickets
>>
>>=RLOCK("ActShows")
>>REPLACE acSold WITH acSold + 1 IN ActShows
>>UNLOCK RECORD xx IN ActShows
>>FLUSH IN ActShows
>>
>>There are lots of these relatively small things going on, but monitoring the network shows that the queries take most of the bandwidth, the updating much less.
>>
>>There are lots of smaller queries where I want to see the status of the shows, sold out shows etc, but the indexes are all there. Perhaps too many indexes?
>>
>>>What method are you employing to read/write to/from the vfp tables?
>>>
>>>
>>>>Hello,
>>>>
>>>>We installed a ticket software on a remote location that has a 10 Mbps link to the main server. The software uses VFP tables and does some usual queries and record locks, but nothing to extravagant.
>>>>
>>>>However, we see that the network utilization often spikes up to 4 Mbps when doing a ticket sale for example.
>>>>
>>>>That causes the system to slow down dramatically when 2 or more computers are processing simultaneously.
>>>>
>>>>Before I am going to try to change the software to use less bandwidth, does a usage of 4Mbps sound particularly huge for VFP tables, or is this in the "normal" range of bandwidth usage? Because if I cannot hope to decrease the bandwidth to let's say only 1 Mbps maximum, I would have to consider rewriting the software to a client / server application.
>>>>
>>>>So I would like to know if somebody can give me some figures about what to expect. I am of course aware of the fact that it largely depends on the queries and size of data that gets transferred, but nevertheleless I do need a kind of a starting point to come to a final conclusion.
Christian Isberner
Software Consultant
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