Hi,
Disk space is re-used after 45 seconds (the default retention time). Disk
space should stabilise at some point, unless if you add more and more data.
"checkpoint" should reduce disk space usage, but you may need to call it a
few times.
Regards,
Thomas
On Friday, February 6, 2015, Damien Coraboeuf <damien.corabo...@gmail.com>
wrote:
> FYI, we were using 1.4.184 together with a JDK 1.8.0u11, on a CentOS 6,
> and the database kept growing by chunks of ~ 10 MB. We have upgraded to JDK
> 1.8.0u31, and although the file keeps growing, it is now by tiny chunks of
> kilobytes. So much better. I just hope there is some kind of runtime
> cleanup going on, because it would still go over 1.0 GB in 30 days :(
>
> Is there a way to launch some SQL commands at runtime to make the database
> shrink?
>
> Damien.
>
> On Wednesday, 4 February 2015 23:01:07 UTC+1, Max Lord wrote:
>>
>> I also had problems with an mvstore db growing out of control (about 3GB
>> for 1M rows). I updated to 1.4.184, reimported, and it was much smaller
>> (100MB).
>>
>> So the recent changes have had a very positive effect.
>>
>> Unfortunately, I was using 1.4.178 because that was the current jar
>> bundled with the jdbc-h2 ruby gem. That version doesn't seem like such a
>> good default.
>>
>> On Monday, February 2, 2015 at 2:42:28 PM UTC-5, Damien Coraboeuf wrote:
>>>
>>> I have replaced by BLOB columns by BINARY(32000) ones (more than enough
>>> in our case). After exporting the database in SQL ('script' command),
>>> recreating a blank database and reimporting the SQL ('runscript'), I went
>>> from 1.7 Gb to 17 Mb.
>>>
>>> I'll monitor the database in the next days to see if the inflation
>>> starts again.
>>>
>>> Damien.
>>>
>>> On Monday, 2 February 2015 17:40:49 UTC+1, Damien Coraboeuf wrote:
>>>>
>>>> Hi,
>>>>
>>>> Speaking of real world example - we are using H2 1.4.x to hold results
>>>> for a continuous delivery chain. With 1.4.177, our database was > 600 Mb,
>>>> and after a 'shutdown defrag', we went down to... 11 Mb. We switched to
>>>> 1.4.184 but now, the database has grown up to 1.7 Gb. That's a serious
>>>> issue for us :(
>>>>
>>>> The URL we use is:
>>>>
>>>> jdbc:h2:/opt/ontrack/database/data;MODE=MYSQL
>>>>
>>>> Damien.
>>>>
>>>> On Monday, 5 January 2015 18:15:56 UTC+1, Thomas Mueller wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> OK, that's nice! There is still quite a lot of room for improvements,
>>>>> and I don't consider this completely fixed, but will not work on it with
>>>>> very high priority any longer.
>>>>>
>>>>> Regards,
>>>>> Thomas
>>>>>
>>>>>
>>>>> On Sunday, December 21, 2014, Steve McLeod <steve....@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi Thomas,
>>>>>>
>>>>>> The database file size in 1.4.184 is much, much better than in
>>>>>> earlier 1.4.x releases.
>>>>>>
>>>>>> I've done some trials and these are my findings:
>>>>>>
>>>>>> 1.3.176: Fully loaded database after shutdown is 317 Mb
>>>>>> 1.4.184: Fully loaded database after shutdown is 380 Mb
>>>>>>
>>>>>> This seems reasonable.
>>>>>>
>>>>>>
>>>>>> On Friday, 19 December 2014 17:15:29 UTC+8, Thomas Mueller wrote:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> Version 1.4.184 should produce smaller database files than previous
>>>>>>> version (1.4.x - 1.4.182), maybe half or a third of the old file size.
>>>>>>> It
>>>>>>> would be great to get some real-world results!
>>>>>>>
>>>>>>> Regards,
>>>>>>> Thomas
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Tue, May 6, 2014 at 6:24 PM, Thomas Mueller <
>>>>>>> thomas.to...@gmail.com> wrote:
>>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> Some initial results: you can shrink the database by running
>>>>>>>> "shutdown compact" or "shutdown defrag". Each time this is run, it
>>>>>>>> shrinks
>>>>>>>> a few MB (up to some point, of course). This works, but it's relatively
>>>>>>>> slow. Now the task is to make it faster. There are two ways: shrink it
>>>>>>>> fully to the minimum size, and shrink it incrementally (like now) but
>>>>>>>> faster. I'm working on that now.
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Thomas
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, May 6, 2014 at 11:39 AM, Steve McLeod <steve....@gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Hi Thomas,
>>>>>>>>>
>>>>>>>>> I've sent you a private email with a link to the new database
>>>>>>>>> file, made with H2 1.4.178
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>>
>>>>>>>>> Steve
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Monday, 5 May 2014 07:46:16 UTC+2, Thomas Mueller wrote:
>>>>>>>>>
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> The database file should shrink if you run "shutdown defrag".
>>>>>>>>>>
>>>>>>>>>> The current compact algorithm is quite inefficient, that means
>>>>>>>>>> the databases file is quite big on average. The highest priority is
>>>>>>>>>> still
>>>>>>>>>> to ensure it always works correctly, and when that's done I will
>>>>>>>>>> work on
>>>>>>>>>> more efficiently re-using disk space and specially compact the file
>>>>>>>>>> faster
>>>>>>>>>> when closing the database.
>>>>>>>>>>
>>>>>>>>>> Could you send me the new database file? It would be nice to have
>>>>>>>>>> a real-world database file to test this. The last file you sent
>>>>>>>>>> helped a
>>>>>>>>>> lot, thanks to it I found some problems that completely prevented
>>>>>>>>>> the file
>>>>>>>>>> to shrink.
>>>>>>>>>>
>>>>>>>>>> Regards,
>>>>>>>>>> Thomas
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Sunday, May 4, 2014, Steve McLeod <steve....@gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi Thomas,
>>>>>>>>>>>
>>>>>>>>>>> I tested the same large data import with H2 1.4.178, and there
>>>>>>>>>>> is no improvement over H2 1.4.177.
>>>>>>>>>>>
>>>>>>>>>>> Here are the file sizes, in both cases after the app has stopped:
>>>>>>>>>>>
>>>>>>>>>>> H2 1.3.176: pokercopilot.h2.db 301,669,352 bytes
>>>>>>>>>>> H2 1.4.178: pokercopilot.mv.db 1,023,037,440 bytes
>>>>>>>>>>>
>>>>>>>>>>> Let me know what I can do to help.
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>>
>>>>>>>>>>> Steve
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Saturday, 19 April 2014 11:44:05 UTC+2, Steve McLeod wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi Thomas,
>>>>>>>>>>>
>>>>>>>>>>> Great! Glad I could help make your superb product even better.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Friday, 18 April 2014 21:38:27 UTC+2, Thomas Mueller wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi,
>>>>>>>>>>>
>>>>>>>>>>> Thanks a lot for the database! I know what the problem is now,
>>>>>>>>>>> but I couldn't fix it yet. The database file (pokercopilot2.mv.db)
>>>>>>>>>>> has
>>>>>>>>>>> about 181 MB of "live" data, the rest (about 78%) is not used. The
>>>>>>>>>>> mechanism to get rid of the unused space is not working as it
>>>>>>>>>>> should for
>>>>>>>>>>> this case (I think the problem is that b-tree nodes are not
>>>>>>>>>>> processed
>>>>>>>>>>> correctly). This will be fixed in the next release.
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>> Thomas
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Fri, Apr 18, 2014 at 5:29 PM, Steve McLeod <
>>>>>>>>>>> steve....@gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi Thomas,
>>>>>>>>>>>
>>>>>>>>>>> I've sent a link to file privately to your email address.
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>>
>>>>>>>>>>> Steve
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Friday, 18 April 2014 14:04:37 UTC+2, Thomas Mueller wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi,
>>>>>>>>>>>
>>>>>>>>>>> Hm, that didn't help much. Could you send me the (compressed)
>>>>>>>>>>> database files please? If it's too big, what is the compressed size
>>>>>>>>>>> of the
>>>>>>>>>>> files?
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>> Thomas
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Fri, Apr 18, 2014 at 1:07 PM, Steve McLeod <
>>>>>>>>>>> steve....@gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi Thomas,
>>>>>>>>>>>
>>>>>>>>>>> Thanks for the suggestion. I tried adding ";retention_time=1000"
>>>>>>>>>>> to the URL, and this resulted in a small improvement.
>>>>>>>>>>>
>>>>>>>>>>> pokercopilot.h2.db 302,018,560 bytes
>>>>>>>>>>> pokercopilot.mv.db 999,120,896 bytes
>>>>>>>>>>> pokercopilot.mv.db with RETENTION_TIME=1000: 811,728,896 bytes
>>>>>>>>>>>
>>>>>>>>>>> These numbers all reflect a loading of data in a newly created
>>>>>>>>>>> database that consisted of roughly 2,400,000 INSERTS and
>>>>>>>>>>> UPDATES with plenty of SELECTS and almost no DELETES. After the
>>>>>>>>>>> loading was
>>>>>>>>>>> complete, I let the application keep running with the database open
>>>>>>>>>>> for a
>>>>>>>>>>> few minutes, then close the application and therefore the database.
>>>>>>>>>>>
>>>>>>>>>>> Here is the full JDBC url I'm using:
>>>>>>>>>>> jdbc:h2:/Users/steve/Library/Application
>>>>>>>>>>> Support/com.barbarysoftware.pokercopilot/database/pokercopil
>>>>>>>>>>> ot;DATABASE_EVENT_LISTENER='com.barbarysoftware.pokercopilot
>>>>>>>>>>> .database.DatabaseListener';COMPRESS_LOB=DEFLATE;CACHE_SIZE=
>>>>>>>>>>> 65536;RETENTION_TIME=1000
>>>>>>>>>>>
>>>>>>>>>>> Let me know if there is anything else I can do to help diagnose
>>>>>>>>>>> this.
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>>
>>>>>>>>>>> Steve
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Thursday, 17 April 2014 17:15:50 UTC+2, Thomas Muel
>>>>>>>>>>>
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