About PESSIMISTIC_WRITE

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Data migration from SQLServer to ObjectDB

Hi, could someone recommend a good tool to use for data migration from SQLServer to ObjectDB. Unfortunately there is currently no such automatic tool. Using a JPA ORM library (e.g. Hibernate or EclipseLink) you can write your own conversion program that retrieves data from the SQLServer database as
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Data portability

from ObjectDB to another database requires writing a conversion program that: Retrieves all the entity
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Database access error , Doctor hanging on trying to repair, production shutdown at our biggest customer

the system is permanently under heavy load. Recording affects the performance significantly, right ? If you write
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DB Doctor sets type to "unknown" for new fields

the workaround of writing several lines of code to update the database after adding a new field. prolancer
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DB Explorer and Doctor unable to open DB file

Hi, one of my DB files can not be open by neither DB explorer, nor the DB Doctor. Both are writing same mistake : ObjectDB Doctor [version 2.5.6_05] Copyright (c) 2014, ObjectDB Software. All rights reserved. ------------------------- No errors have been found ------------------------- com
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Deadlock in Doctor

Hi, Doctor from latest build has some kind of deadlock when writing new version of database file: [378554] pl.hplxtool.model.Product(6):8936610 Referenced by:   - pl.hplxtool.model.Offer(46):8936608 [378555] pl.hplxtool.model.Product(6):8936616 Referenced by:   - pl.hplxtool.model.Offer(46
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Degrading performance overtime

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Delete object from collection versus delete from JPQL

I'm a newbie, so this is a pretty fundamental question. I'm not sure if there is a bi-directional relationship between the objects in memory and ObjectDB.  I know I can modify the objects and use persist() to write them to the database.  But does running a JPQL update or delete alter the in-memory
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em.flush(); em.clear(); loosing data and not persisting managed objects

and defects are stored in a database. Each table has hundreds of thousands of entries. I'm trying to write
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Embedded in JDO metadata not working in objectDB 2.x ?

you will have to write a small program that retrieves all the relevant containing entity objects