Hi,
MA wrote:
Hi ,
I wanted to know the best setting for performance.
I have a Table A and a table B (1:n) with the n side relationship having
potentially large data.
So if i use ObjectCacheTwoLevel and forceProxies=true will the n side be a
collection proxy?
yep!
The problem i have is if i make this property
forceProxies=true every relationship of the main object looked up is a
proxy(and i don't want this behaviour for 1:1). Does this setting improve
performance? or if i defined proxy classes or collection proxy in my
repository_user will be behaviour be same?
Instead of using the cache forceProxies=true setting you can manage the
the proxy creation more fine grained using the "proxy" attribute in
reference-descriptor and collection-descriptor.
That is
if in Class A - Class B(1:n) ,A is looked up from cache, I want to know ifl
the objects in relationship "rel" be materialized,?
if I use
forceProxies=false and the definition in repository_user.xml is something
like below
<class-descriptor class="ClassA">
<field-descriptor...../>
.....
<collection-descriptor name="rel" collection-class="ManageableArrayList"
element-class-ref="ClassB" proxy="true">
<inverse-foreign field-ref="bpk"/>
</collection-descriptor>
</class-descriptor>
No, in this case the proxy is used too. The "forceProxies=true"
attribute only forces the use of proxies, if 'false' the settings in
reference/collection-descriptor is used.
http://db.apache.org/ojb/docu/guides/objectcache.html#ObjectCacheTwoLevelImpl
regards,
Armin
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