Re: [eclipselink-users] RE POST: Why does eclipselink consume the whole

[James Sutherland <jamesssss@xxxxxxxxx>]

By default EclipseLink (and JPA in general) uses a sequence pre-allocation
size of 50.  This will improve performance by avoiding accessing the
database on every insert.  You can use a id generator to set your
pre-allocation size to 1 if you desire.  This will have a very negative
impact on your applications performance.  I would always strongly recommend
using sequence pre-allocation.

See,
http://en.wikibooks.org/wiki/Java_Persistence/Identity_and_Sequencing#Sequencing



simpatico_qa wrote:
> 
> http://stackoverflow.com/questions/4037669/why-does-eclipselink-consume-the-whole-allocationsize-each-time-its-rebooted
> 
> Hello, I've just noticed that for my entity's id, eclipselink assigns an
> id
> 1 + the previously greated assigned IN THE SAME SESSION (1), as opposed to
> in the element table (2). This goes against my application expectations.
> 
> What's the easiest way to tell it to do 2?
> 
>  @Id
> @GeneratedValue(strategy = GenerationType.AUTO)
> private int objId;
> 
> 
> 
> ij> connect 'jdbc:derby:db';
> 
> ij> set schema memo; 0 Zeilen eingef?gt/aktualisiert/gel?scht ij> select *
> from meaning;
> OBJID |LASTPUBLI&|USR_EMAIL
> 
> 1 |NULL |NULL
> 2 |2010-10-27|NULL
> 51 |NULL |NULL
> 101 |NULL |NULL
> 
> 
> -- 
> Regards,
> K. Gabriele
> 
> --- unchanged since 20/9/10 ---
> P.S. If the subject contains "[LON]" or the addressee acknowledges the
> receipt within 48 hours then I don't resend the email.
> subject(this) ∈ L(LON*) ∨ ∃x. (x ∈ MyInbox ∧ Acknowledges(x, this) ∧
> time(x)
> < Now + 48h) ⇒ ¬resend(I, this).
> 
> If an email is sent by a sender that is not a trusted contact or the email
> does not contain a valid code then the email is not received. A valid code
> starts with a hyphen and ends with "X".
> ∀x. x ∈ MyInbox ⇒ from(x) ∈ MySafeSenderList ∨ (∃y. y ∈ subject(x) ∧ y ∈
> L(-[a-z]+[0-9]X)).
> 
> 


-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland 
http://www.eclipse.org/eclipselink/
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