Hi,
Most of the updates are DELETE/INSERT queries, i.e
DELETE {?s ?p ?oldValue}
INSERT {?s ?p ?newValue}
WHERE {
OPTIONAL {?s ?p ?oldValue}
#derive ?newValue from somewhere
}
We also have some separate DELETE queries and INSERT queries.
I’ve tried HTTP POST /$/compact/db_name and as a result the files are
getting back to normal size. However, as far as I can tell the old files
are also kept. This is the folder structure I see:
- databases/db_name/Data-0001 - with the old large files
- databases/db_name/Data-0002 - presumably the result of the compact
operation with normal file sizes.
Is there also some operation (http or cli) that would keep only one (the
latest) data folder, i.e. delete the old files from Data-0001?
Gaspar
On 6 Jul 2022, at 12:52, Lorenz Buehmann <
[email protected]> wrote:
Ok, interesting
so
we have
- 150k triples, rather small dataset
- loaded into 10MB node table files
- 10 updates every 5s
- which makes up to 24 * 60 * 60 / 5 * 10 ~ 200k updates per day
- and leads to 10GB node table files
Can you share the shape of those update queries?
After doing a "compact" operation, the files are getting back to
"normal" size?
On 06.07.22 10:36, Bartalus Gáspár wrote:
Hi Lorenz,
Thanks for quick feedback and clarification on lucene indexes.
Here are my answers to your questions:
- We are uploading 7 ttl files to our dataset, where 1 is larger 6Mb,
the others are below 200Kb.
- The overall number of triples after data upload is ~150000.
- We have around 10 SPARQL UPDATE queries that are executed on a
regular and frequent basis, i.e. every 5 seconds. We also have 5 such
queries that are executed each minute. But most of the time they do not
produce any outcome, i.e. the dataset is not altered, and when they do,
there are just a couple of triples that are added to the dataset.
- These *.dat files start from ~10Mb in size, and after a day or so
some of them grow to ~10Gb.
We have ~300 blank nodes, and ~half of the triples have a literal in
the object position, so ~75000.
Best regards,
Gaspar
On 6 Jul 2022, at 10:55, Lorenz Buehmann <
[email protected]> wrote:
Hi and welcome Gaspar.
Those files do contain the node tables.
A Lucene index is never computed by default and would be contained in
Lucene specific index files.
Can you give some details about the
- size of the files
- the number of triples
- the number triples added/removed/changed
- the frequency of updates
- how much the files grow
- what kind of data you insert? Lots of blank nodes? Or literals?
Also, did you try a compact operation during time?
Lorenz
On 06.07.22 09:40, Bartalus Gáspár wrote:
Hi Jena support team,
We are experiencing an issue with Jena Fuseki databases. In the
databases folder we see some files called SPO.dat, OSP.dat, etc., and the
size of these files are growing quickly. From our understanding these files
are containing the Lucene indexes. We would have two questions:
1. Why are these files growing rapidly, although the underlying data
(triples) are not being changed, or only slightly changed?
2. Can we disable indexing easily, since we are not using full text
searches in our SPARQL queries?
Our usage of Jena Fuseki:
* Start the server with `fuseki-server —port 3030`
* Create databases with HTTP POST to
`/$/datasets?state=active&dbType=tdb2&dbName=db_name`
* Upload ttl files with HTTP POST to /db_name/data
Thanks in advance for your feedback, and if you’d require more input
from our side, please let me know.
Best regards,
Gaspar Bartalus
