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From Mike Matrigali <mikem_...@sbcglobal.net>
Subject Re: Database Size Limit
Date Tue, 11 Jan 2005 19:37:01 GMT
Note that derby uses 64 bit file addressing, so as jack says it is
limited by the files system support up to 64bit addressing.

If you need a database that is bigger than a single disk, if your OS
supports it you need to map multiple disks so that to the JVM it looks
like a single disk under the directory.  Derby provides no spreading of
a single table across disks (either striping or union).  The assumption
is that the OS/filesystem/disk controller can do this below derby.

So the derby architecture has few upper limits on size of data, but it
does not have features one might expect in a VLDB (ie. parallel thread
execution of a single query, parallel sort, offline indexing,
incremental backup, ...).

Jack Klebanoff wrote:

> Hong Ji wrote:
> 
>> Hi,
>>
>> Does Derby have any limit on the database size?
>>
>>  
>>
>> Thanks.
>>
>> Hong
>>
> A Derby database is stored in multiple files under one directory, so the
> database size is limited by the file system. The maximum database size
> is limited by the maximum that the file system allows in one partition.
> It is system dependent.
> 
> By default the log files are stored on the same partition as the data,
> further limiting the database size. However the log files can be stored
> on a separate partition.
> 
> Jack
> 

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