Understanding the SecondaryDatabase

Question

Hi,
my conf:
berkeley db je 5.0.73
I use DPL
I have seen several exemples where you use SecondaryDatabase or not and I can't understand in wich case I need it. I ask the question because I have currently an exception : primary record contains a key that is not present in the secondary. It happens when I try to delete my Tab class wich I just have updated with a new class Url in it, here is some code.
I have 2 classes in my application, Tab wich can have one or more Urls in it.
@Entity
public class Tab implements GenericModel {
     @PrimaryKey(sequence = "tabSequenceId")
     private long id;
     @SecondaryKey(relate = Relationship.MANY_TO_ONE)
     private String userPicUniqueId;
     @SecondaryKey(relate = Relationship.ONE_TO_MANY, relatedEntity = Url.class, onRelatedEntityDelete = DeleteAction.NULLIFY)
     private Set<Long> urlIds = new HashSet<Long>();
     private String type;
     public Tab() {}
     public Tab(String userPicUniqueId, String type) {
          this.userPicUniqueId = userPicUniqueId;
          this.type = type;
@Entity
public class Url implements GenericModel{
     @PrimaryKey(sequence = "urlSequenceId")
     private long id;
     @SecondaryKey(relate = Relationship.MANY_TO_ONE, relatedEntity = Tab.class, onRelatedEntityDelete = DeleteAction.CASCADE)
     private long tabId;
     private String url;
     public Url() {}
     public Url(String url) {
          this.url = url;
etc..
I configured the environment and store exactly like this :
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setAllowCreate(true);
envConfig.setTransactional(true);
env = new Environment(dataDirectory, envConfig);
StoreConfig storeConfig = new StoreConfig();
storeConfig.setAllowCreate(true);
storeConfig.setTransactional(true);
store = new EntityStore(env, "MyStore", storeConfig);
So i have several questions.
1) Do I need to configure primary and secondary databases ?
2) If I have @SecondaryKey used as foreign keys, do I need to have secondary database ?
Edited by: dgoman on 4 avr. 2013 06:13

Answer 1

To resolve my problem I did as in this thred Re: Problem during deleting ....
(see the first response of Mark)
Edited by: dgoman on 4 avr. 2013 07:01