Re: how to monitor the amount of bytes fetched in a executeQuery()
От | Oliver Jowett |
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Тема | Re: how to monitor the amount of bytes fetched in a executeQuery() |
Дата | |
Msg-id | 44B4846A.3010307@opencloud.com обсуждение исходный текст |
Ответ на | how to monitor the amount of bytes fetched in a executeQuery() ? (Albert Cardona <acardona@ini.phys.ethz.ch>) |
Ответы |
Re: how to monitor the amount of bytes fetched in a executeQuery()
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Список | pgsql-jdbc |
Albert Cardona wrote: > I have a system in which large (13Mb) images are stored in the database as > compressed bytea column entries. When fetching from the local computer it's > fast enough the lag is not noticeable. When fetching remotely at 1Mb LAN > speed, about 15 seconds elapse. > > After timing the executeQuery() and the getBinaryStream(), the first takes > about 15 seconds and the second about 3. So it looks like the executeQuery() > is actually downloading the image, and the getBinaryStream is merely copying > it from a local resource. Is that right? Yes. > Is there any way in which the number of bytes fetched in a query or for a > particular column can be monitored, so I can display a more accurate and > elaborated waiting dialog in my application? I can't see any way to do this, unfortunately. -O
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