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From "Haroldo Nascimento" <haroldo.ara...@gmail.com>
Subject Re: RAMDirectory vs FSDirectory
Date Tue, 27 Nov 2007 14:36:03 GMT
You can serialize this object RAMDirectory em disk. When start the
application , it read the file .ser and load the object in memory.
The time of load of file .ser is much fast.
You need change any classes of Lucece: Add the "implements Serialzable" in
any classes.



On Nov 27, 2007 4:28 AM, Chhabra, Kapil <kchhabra@akamai.com> wrote:

> > one can improve search performance by using a RAMDirectory created
> from an underlying FSDirectory using one of the parameterised
> constructors. Is this correct?
> Absolutly
>
> > Will a FSDirectory not automatically load the index into memory
> provided enough RAM is available?
> Not all index files are loaded in the RAM if you are using the
> FSDirectory. Though at the same time, queries are cached.
>
> > Do I have to explicitly use a RAMDirectory?
> If you want to load the comeplte index in the memory, yes. This increase
> the performance a lot as it drastically reduces the number of disk IO.
> Obviously at the cost of the RAM. If you have enough RAM available to
> accommodate the complete index, you can go ahead with this.
>
> Regards,
> kapilChhabra
>
> -----Original Message-----
> From: Hardy Ferentschik [mailto:hardy@ferentschik.de]
> Sent: Tuesday, November 27, 2007 12:25 PM
> To: java-user@lucene.apache.org
> Subject: RAMDirectory vs FSDirectory
>
> Hi there,
>
> I am using currently a FSDirectory to build my index. The reason for
> using a file system based index is that a full index rebuild takes
> around 30 minutes and I want to keep a persistent index.
> In 'Lucene in Action' I've read that one can improve search performance
> by using a RAMDirectory created from an underlying FSDirectory using one
> of the parameterised constructors. Is this correct? Will a FSDirectory
> not automatically load the index into memory provided enough RAM is
> available?
> Do I have to explicitly use a RAMDirectory?
>
> --Hardy
>
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