On Aug 7, 1:33 am, Nick Johnson (Google) nick.john...@google.com
wrote:
Queries fetch the entities in parallel - as do bulk gets. Thus, the
time taken for the entity-fetching part of a query or a bulk get is
proportional to the time required to fetch the slowest entity (plus
some overhead
On Aug 7, 1:33 pm, Alkis Evlogimenos ('Αλκης Ευλογημένος)
evlogime...@gmail.com wrote:
Oh I see you time only the last db.get() call. Nevertheless you are still
not comparing apples to apples. In the db.get case you fetch entities and in
the query case you fetch keys only.
There is a
On Aug 7, 1:33 pm, Alkis Evlogimenos ('Αλκης Ευλογημένος)
evlogime...@gmail.com wrote:
Oh I see you time only the last db.get() call. Nevertheless you are still
not comparing apples to apples. In the db.get case you fetch entities and in
the query case you fetch keys only.
There is a
http://benchmaker.appspot.com/benchmark/bench/
See get 20 vs query 20. I must be doing something wrong here. The data
in the datastore is about 1000 objects created with its ID
autogenerated. There are no other objects, so these objects have
sequentially incremental IDs.
What is wrong with my
On Aug 6, 5:27 pm, Alkis Evlogimenos ('Αλκης Ευλογημένος)
evlogime...@gmail.com wrote:
You are doing multiple db.get calls while you do a single Query.fetch.
But isn't the point of db.get for multiples a direct real-time (i.e.
constant time) grab? Where as a query searches through an index
it will not
be a problem.
For n=3 it should work. ( I might remember reading the number 300
sometime in this list for db.get() )
2009/8/4 Oliver Zheng goo...@oliverzheng.com:
I have run into a request too large for db.get (not db.put). It
appears that sometimes I may need to request for thousands
I have run into a request too large for db.get (not db.put). It
appears that sometimes I may need to request for thousands of tiny
objects, and this is hitting a barrier. What is the limit and what is
it determined by?
Thanks,
Oliver
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You
For a model, I have a ListProperty of Keys, and whenever I access it,
it's a list of keys. Great. How can I access a ReferenceProperty of a
model and have it return a Key instead of the actual instance (which
has to be retrieved from datastore)? I've setup my models by putting a
lot of info into
I am currently using app-engine-patch, but now that Django 1.0 has
been released on GAE, I'd like to port my app over. App-engine-patch
zipimports Django and patches a lot of things to make it work out of
the box, for example the User model is modified to use GAE models, and
memcache is used for
Is it a hash function in that the resulting string is randomly
distributed among its range? It seems like in a distributed hash table
like BigTable, this would be how it's implemented.
The reason I'm asking is, I want to do a random query. I want to
select a random entity from an entity group. I
I forgot to include this question:
What is the overhead of querying like this for just the first result,
vs just getting with the key? What is the magnitude of difference in
time?
On Jun 12, 4:22 pm, Oliver Zheng goo...@oliverzheng.com wrote:
Is it a hash function in that the resulting string
the specific members of a
polymodel
You probably need to put together a PolyModel aware version of
ReferenceProperty
T
On Jun 2, 9:31 am, Oliver Zheng goo...@oliverzheng.com wrote:
I am noticing this behaviour (which I think is a bug):
class A(PolyModel):
pass
class B
using a regular db.Model parent class.
db.PolyModel adds a listproperty of parent classes to each stored entity,
which adds extra indexing overhead, and will in some cases require indexes
for queries that otherwise wouldn't.
-Nick Johnson
On Mon, Jun 1, 2009 at 6:33 PM, Oliver Zheng goo
auto_now=True is very handy for most modified timestamp properties. Is
it possible to override this behaviour on certain occasions?
Thanks,
Oliver
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= db.get(h1)
h1.parents.fetch(5)
h1.children.fetch(5)
I'm guessing the above would be OK if it is acceptable that the
Child's reference to House is called 'home' instead of the parent
classes 'house'.
Thank you,
Jeff
On May 22, 11:19 am, Oliver Zheng goo...@oliverzheng.com wrote:
I'm
I am noticing this behaviour (which I think is a bug):
class A(PolyModel):
pass
class B(B):
a = ReferenceProperty(A, collection_name='b')
class C(A):
a = ReferenceProperty(A, collection_name='c')
a = A()
a.put()
b = B()
b.a = a
b.put()
c = C()
c.a = a
c.put()
Now, a.b returns b
A lot of my models have things like modified_time and created_time. I
currently have them setup so they inherit this from a PolyModel class.
Is this a smart idea? I see that they are grouped together in the
admin page. Performance wise, does this mean they will have to be
located on the same
Perfect. Thanks.
I realized that for my needs, logarithmic scaling might suit better.
In that case, to calculate frequency distribution, I can pretty much
use a fixed number of buckets, since the maximum number is probably
only 20 magnitudes larger than the smallest.
Cheers,
Oliver
For aggregate functions like sum or average, it has been recommended
that they be calculated at the time of saving each new or old entry. But
how would one go about calculating percentile?
Is it mathematically possible to spread out the calculation of
percentiles over new entries as they come
Also, how would the calculation of frequency distribution be amortized
as new values come in?
On May 25, 3:25 pm, Oliver Zheng goo...@oliverzheng.com wrote:
For aggregate functions like sum or average, it has been recommended
that they be calculated at the time of saving each new or old entry
Hi Jason,
On May 12, 5:12 pm, Jason (Google) apija...@google.com wrote:
[...] thereby improving the performance of your application [...]
What is the extent of this? I suppose you mean that if you know the
key, you can construct an object and save it to datastore by
overwriting it, without
I'm trying to create a hierchy of kinds, the obvious reason of which
is that kinds can share model fields. However, for
ReferenceProperties, collection_name is fixed to when the model field
is declared in the model class. If this is declared in the parent
class, then all the children will have
I have been looking at the stored data of some apps, and noticed those
3 columns. Key appears to be a hash/string of some sort. ID is usually
empty. Key name looks like an actual readable identifier, but it's
usually just key_ + username or something that already exists.
What is the use for any
I have been looking at the stored data of some apps, and noticed those
3 columns. Key appears to be a hash/string of some sort. ID is usually
empty. Key name looks like an actual readable identifier, but it's
usually just key_ + username or something that already exists.
What is the use for any
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