Home » Eclipse Projects » EclipseLink » JPA/Eclipselink poor performance batch update entity on ManyToOne relationship changes(JPA Batch-Writing)
| JPA/Eclipselink poor performance batch update entity on ManyToOne relationship changes [message #644316] |
Fri, 10 December 2010 14:06  |
 Andoko 
Messages: 4
Registered: December 2010 |
Junior Member |
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I have problem with batch writing in eclipselink when i update an entity properties which link to other entity.
I have a Cardholder entity with @ManyToOne relationship with Card Entity.
@Entity
@Table(name = "...")
@NamedQueries({...})
public class Cardholder implements Serializable {
...
@JoinColumn(name = "card_number", referencedColumnName = "...")
@ManyToOne(fetch=FetchType.LAZY)
private Card card;
}
and a Card with @OneToMany relationship with cardholder
@Entity
@Table(name = "cms_card")
@NamedQueries({...})
public class Card implements Serializable {
@OneToMany(mappedBy = "card")
private List<Cardholder> cardholderList;
}
I already have List of child (persisted cardholders). Now i want to add some card to them, so : // cardholderList is a managed entity list.
for (Cardholder cardholder : cardholderList) {
Card newCard = new Card();
...
cardholder.setCard(newCard);
List<Cardholder> cardCardholders = new ArrayList<Cardholder>();
cardCardholders.add(cardholder);
newCard.setCardholderList(cardCardholders);
cardsToBePersisted.add(newCard);
++i;
}
I configured my Persistence.xml to use batch-writing, but performance is horribly slow for +-15000 list update. Now, when i check into generated SQL, i found that Eclipselink is creating one batch for one query, its like :
FINER: Begin batch statements
FINE: INSERT IGNORE INTO cms_card (card_number, status, chip_serial_number, dwh_status, valid_until, card_holder_id, file_perso_history_id, feedback_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
FINE: bind => [9030002005890011, ACTIVE, null, false, 2015-12-10, null, 241, null]
FINER: End Batch Statements
FINER: Begin batch statements
FINE: UPDATE cms_cardholder SET card_number = ? WHERE (id = ?)
FINE: bind => [9030002005890011, 176075]
FINER: End Batch Statements
FINER: Begin batch statements
FINE: INSERT IGNORE INTO cms_card (card_number, status, chip_serial_number, dwh_status, valid_until, card_holder_id, file_perso_history_id, feedback_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
FINE: bind => [9030002005889908, ACTIVE, null, false, 2015-12-10, null, 241, null]
FINER: End Batch Statements
I think this is because i set a new parent property (card) to existing children.
I also try to play with reversing the parent - child relationship (cardholder->card instead of card->cardholder). Batch insert is correct after i reverse the relationship in entity and database, but still Eclipselink would query the database (SELECT * from card where cardholder.id = ?), so for 15000 record i got 15000 select statement. Better than above, but still very very slow.
Is there any mistake i made in setting up batch-writing? Thank you very much.
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