At this point, the backup utility can backup an memFS database, but the
restore utility is failing to work going from a backup file to a memFS
database.
Given Backup being run like on a memFS database, a file is created:
> Backup.execute("D:\\h2\\test.mv.db", "memFS:test", "", true);
>
Is there a way to get Restore to work from a backup to a memFS database? If
so how, if not can I request this feature? The use case being, I want to
open a populated memFS database on a different jvm at a later time with h2
in embedded mode.
> Restore.execute(X, Y, null);
>
On Wednesday, 23 April 2014 02:50:09 UTC-4, Thomas Mueller wrote:
>
> Hi,
>
> You need to read the documentation (javadocs) about backup and restore
> more closely. The parameter values don't make much sense to me.
>
> Regards,
> Thomas
>
>
>
> On Tue, Apr 22, 2014 at 8:20 PM, Carl Desautels
> <[email protected]<javascript:>
> > wrote:
>
>> Hi,
>>
>>
>> > Yes, this is documented. I would start with the in-memory file system.
>> Instead of using regular file names, use "memFS:test". So the database URL
>> would be "jdbc:h2:memFS:test". Then you can backup and restore the file
>> using H2 tools using the file name "memFS:test.mv.db".
>>
>> I'm trying to apply this and I have a sample available here:
>> https://gist.github.com/cwdesautels/11188409
>>
>> I would expect
>> ln53<https://gist.github.com/cwdesautels/11188409#file-h2backuprestore-java-L53>to
>> backup the memFS database and
>> ln64<https://gist.github.com/cwdesautels/11188409#file-h2backuprestore-java-L64>to
>> restore it, however this isn't the case, could you tell me what I'm
>> doing wrong and how to get the expected results.
>>
>>
>> On Tuesday, 22 April 2014 14:03:45 UTC-4, Thomas Mueller wrote:
>>
>>> Hi,
>>>
>>> > BTW: If you run a recent Linux, there is a default in memory
>>> filesystem named /dev/shm
>>>
>>> OK, I didn't know this. I didn't test it, but my guess is that the
>>> in-memory file system "memFS:" is faster than /dev/shm, as it doesn't need
>>> any operating system or other native calls.
>>>
>>> Regards,
>>> Thomas
>>>
>>>
>>>
>>> On Tue, Apr 22, 2014 at 8:00 AM, Christoph Läubrich <
>>> [email protected]> wrote:
>>>
>>>> BTW: If you run a recent Linux, there is a default in memory
>>>> filesystem named /dev/shm
>>>>
>>>> Am 21.04.2014 22:00, schrieb Carl Desautels:
>>>>
>>>> Is there a complete sample for how to use offheap, or another file
>>>> system?
>>>>
>>>> And just quickly looking over the code in OffHeapStore it is my
>>>> assumption that between readFully(), offHeap's TreeMap memory, and
>>>> ByteBuffer.duplicate() I could have access to the current database.
>>>>
>>>> Thanks,
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