About ram
General Settings and Logging
Describes general configuration and logging of the ObjectDB Java object database for JPA and JDO. the ObjectDB General configuration section.... temporary path, as demonstrated above. Using RAM is much faster than using temporary files. Therefore, temporary files are ...
in-memory and on-disk support?
I've had a quick read through the features/FAQ and haven't been able to find a clear answer. I'm looking at replacing a setup of H2 where I have 40GB in-memory backed by 800GB on-disk, the 40GB in memory represents the first 40GB of the 800GB on-disk for super-fast recent entry searching, the records at the end continuously purge as the new ones come in(duplicate write, one to in-memory and one to on-disk). ... The small database (40GB) will be managed on a RAM disk / RAM drive . Both databases can be managed in embedded (in ...
Memory leak with OutOfMemoryError exception
Hi, I'm new to using object databases. Currently I'm experience the following error: ... default ObjectDB settings: Temporary data RAM threshold . Page cache size Query ...
Occasionally slow requests in load testing
We are running load testing against objectdb version 2.3.7_18. The performance is generally OK, however there are quite a few "spikes" in the performance where we are getting a lot of very slow response times from the DB, around 10 - 15 seconds. Looking at the DB server process with AppDynamics we can see that most of the requests get stuck in one of 2 places: com.objectdb.o.PGC:w: line number 232 com.objectdb.o.LFL:U: line number 1068 Please see the attached callgraph examples for full stack trace examples. ... processing => cache value. More RAM on the machine. Using a dedicated disk only for the odb file ... but when the database becomes larger than the available RAM a natural decrease in performance is expected. ...
Run out of memory
Hi, I've been looking into ObjectDB for our use, where everything has been great apart from I'm stuck on the following problem. I am trying to load a large file (> 1GB), process certain information and store it back in the database to access / modify later. I require to be able to rollback changes as well, where there can be massive amount of changes. ... flush followed by clear the uncommitted changes persist in RAM (not the file db), hence I am getting out of memory exceptions. ...
One transaction or two?
If I have a large number of objects to delete and then add to a PersistenceManager is it more efficient to do everything in one transaction or two? Currently my code looks like this: ... transaction eliminates some overhead but may require more RAM if you have many large objects, and that may also affect performance. ...
Doctor - high memory usage
Hi, Is it possible to reduce Doctor memory usage? Right now for recovering 67MB database, I need to set heap space to at least 450MB. Even then whole process takes ages. Optimal setting for this database is about 650MB. It's about ten times of size of database. ... Since new computers today have at least 2GB RAM, I don't think that running the Doctor with 512MB max heap size should be a ...
query.getResultList() throws ClassCastException
I modified the example code to include an index on the Point class like so: @Index(members={"x","y"}) Then when I run the following query: TypedQuery<Point> query = em.createQuery("SELECT p FROM Point p where p.x <= :x and p.y >= :y", Point.class); I get the exception at the end. I do not get an exception if I: ... of one million objects (because it would consume less RAM). You can improve query performance by retrieving field ...
