About COUNT

issue

Use temporary files to enable very large transactions

We have transactions in which many objects are created. These objects are no longer needed in the current transaction after creation. Unfortunately, we will receive an OutOfMemory exception because the objects are kept in the first level cache of ObjectDB. In the forum thread http://www.objectdb.com/database/forum/921 on post #4 you wrote, that ObjectDB should support very large transactions in further version. Can you implement it that ObjectDB used temporary files? ... which are referenced by ObjectDB classes. The count of byte arrays grows after flush and clear, although we start the GC ...

 
release

2.5.2

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...

 
release

2.5.3

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...

 
release

2.5.4

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...

 
release

2.5.1

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...

 
forum_thread

Date field Index is corrupted due to time change

Hi, can you shed some light on why we cannot delete data from the attached DB file. A delete attempt with DB explorer results in the following exception: ... Query q = em. createQuery ( "SELECT COUNT(r) FROM DateTime AS r" ) ; em. getTransaction ... q = em. createQuery ( "SELECT COUNT(r) FROM DateTime AS r" ) ; em. getTransaction ...

 
forum_thread

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. #1 2012-04-26 12:56 We are running load testing against objectdb version 2.3.7_18. The performance is generally OK, however there are ...

 
page

ObjectDB Object Database Features

ObjectDB provides a rich set of features, many of them as the result of supporting the JPA and JDO APIs.... Aggregates (COUNT, SUM, AVG, MAX, MIN). ...

 
release

2.5.0

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...

 
release

2.4.7

... optional. Fixed the "Negative snapshot user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( ...