DJTB wrote at 2005-5-21 13:00 +0200:
...
I'm having problems storing large amounts of objects in a ZODB.
After committing changes to the database, elements are not cleared from
memory.
You can control how many objects the ZODB cache may contain.
Note, however, that the objects are usually
Currently, the ZODB cache can only be controlled via the maximal number
of objects. This makes configuration complex as the actual limiting
factor is the amount of available RAM and it is very difficult to
estimate the size of the objects in the cache.
I therefore propose the implementation of
Tim Peters wrote at 2005-6-21 14:56 -0400:
...
[Dieter Maurer]
If you happen to run your application on Linux (and use the GDB), I
can provide detailed instructions on how to find out where your code
hangs...
That would be helpful!
Also you already solved the main problem, I will share
how I
During high availability cluster checks we observed that
ZEOClientStorage's approach to detect connection loss to its
server is unrealiable.
It relies on the fact that the operating system reports
a lost connection. However, by default, TCP does not garantee
any notice for broken connections.
Tim Peters wrote at 2005-6-28 17:09 -0400:
As before, I'd run a different ZEO server for each database. I'm not sure
that what you're doing here will be supported for much longer (or really
even _is_ supported anymore -- see my last msg).
I do not know whether it is supported but it works
Jens Vagelpohl wrote at 2005-7-12 21:49 +0100:
[Lennart]
If it is the majoritys agreement that this answer is the best one, and
that the refresh functionality should be looked at as something that
may or may not work purely on luck, then I'll mark it as deprecated
and up for removal in 2.10.
Jens Vagelpohl wrote at 2005-7-12 18:46 +0100:
...
Due to the nastiness Refresh has to perform under the cover even
Shane has to admit that it simply is not some make development
faster panacea.
Shane might (perhaps) admit it but I do not :-)
There is not much nastiness that Refresh does:
Victor Safronovich wrote at 2005-7-12 18:17 +0600:
My product has 'Auto refresh mode' option checked.
I changed some source code of my product, after that autorefresh have
been
occured.
And after autorefresh I got strange several errors:
...
self._store_objects(ObjectWriter(obj),
Jeremy Hylton wrote at 2005-7-11 18:37 -0700:
IIRC, the old implementation of savepoints kept a copy of the index at
the time the savepoint was taken so that you could rollback to it
multiple times. I don't think there's any way to avoid such a copy.
Maybe, we keep the original implementation (a
Lennart Regebro wrote at 2005-7-12 19:17 +0200:
...
The refresh functionality has been unstable since it became a part of
Zope core, and I have ended up not using it since it since then
I never used auto refresh but always use the manual refresh
and I am very happy with it.
Recently, I
Lennart Regebro wrote at 2005-7-12 20:22 +0200:
...
well, if it happens to work for you, then
good luck, but it is actually a piece of unsupported crap that hasn't
worked for years and that nobody is bothered to fix bugs in.
I have the feeling that we have an easy tendency to say such things:
Tim Peters wrote at 2005-7-14 19:20 -0400:
...
[Dieter]
If we do, we can (usually) create a one with the state after the
restore.
[Tim]
Sorry, I couldn't follow that sentence.
After I have restored to a savepoint s, then the current state is
the one saved in s, thus the sequence:
Tim Peters wrote at 2005-7-15 16:06 -0400:
...
Anyway, for reasons explained before, making a savepoint would still need to
copy the index, so I don't see that this would save anything worth saving.
It might allow skipping an index copy when a _rollback_ is done (at the cost
of clumsier coding
Arthur Peters wrote at 2005-7-31 23:07 -0500:
I am working on a non-Zope app that needs to be notified when objects in
the database change (to update the GUI). How can I get this notification
in all cases including when the object is ghosted? I would really like
to avoid polling.
The ZODB informs
Jim Fulton wrote at 2005-8-23 14:22 -0400:
...
For example, you could have gotten to the same end here
with the old method, by registering your actions with an object of your own
creation, and registering just one commit hook with the transaction, where
that one hook looked at the actions you
Jim Fulton wrote at 2005-8-24 16:08 -0400:
...
I have a *package* (similar to Archetypes SQLStorage) that
wants to go after everything that might possibly change attributes
whether those changes are done by another component from me
or any package developped by someone else.
So again, you
Tim Peters wrote at 2005-8-26 14:59 -0400:
...
Doing
obj._p_changed = True
when obj is a ghost appears to be senseless (what could a user possibly
intend by doing this?)
I met this strange behaviour and considered it a bug.
What I wanted to do: use a ZODB object to synchronize
Tim Peters wrote at 2005-8-26 14:59 -0400:
...
I would like to make it an error (raise a ValueError exception) to attempt
to set obj._p_changed to a true value when obj is a ghost. Does anyone
object?
I came along an argument against this change:
Assume, you have a persistent object o with a
Paolo Linux wrote at 2005-9-21 11:23 +0200:
...
I had zodb hanging when It had to solve Conflict situations.
It turned out to be that it tried to import some modules that
tried to instantiate ClientStorage...
I easily fixed the hurting code...
Lesson learned:
- never automatically register in
Florent Guillaume wrote at 2005-9-24 10:10 +0200:
Dieter Maurer [EMAIL PROTECTED] wrote:
Thus, promiss the user that any persistent changes he may try
will be lost: Put the afterCommit in its own transaction and abort
it afterwards.
I should have added will be lost, unless he itself
We have the need to mount dozens, if not hundreds of ZODBs in a single
Zope instance.
With the current implementation, each ZODB connection has its own
independent cache. This makes it very difficult to use the
available memory efficiently for caching. As the caches are independent,
a heavily
Toby Dickenson wrote at 2005-9-30 16:40 +0100:
On Friday 30 September 2005 11:40, Dieter Maurer wrote:
We have the need to mount dozens, if not hundreds of ZODBs in a single
Zope instance.
With the current implementation, each ZODB connection has its own
independent cache. This makes it very
Chris McDonough wrote at 2005-10-5 09:58 -0400:
... savepoint difficulty ...
Sure. BlobStorage is a wrapper around an existing storage. The
wrapped storage's connections might support savepoints, which implies
that they support rollback. But supporting rollback for a
BlobDataManager is
Victor Safronovich wrote at 2005-10-18 13:18 +0600:
...
May be usefull to add some simple workflow to Persistent class with
states:
GHOST
UPTODATE
CHANGED
STICKY
transitions:
Most of the transitions are there (though through strange names)
activate
--
Chris Withers wrote at 2005-10-19 13:53 +0100:
...
from binascii import unhexlify
def oid_unrepr(oidr):
if oidr.startswith('0x'):
oidr = oidr[2:]
h = unhexlify(oidr)
return '\x00'*(8-len(h))+h
def oidr2obj(app,oidr):
return app._p_jar[oid_unrepr(oidr)]
First
Erik A. Dahl wrote at 2005-10-21 08:56 -0400:
I just upgraded a client site from zope 2.6.2 to 2.8.1 (which I think
has ZODB 3.4.1). After the upgrade I'm seeing very slow initial load
times for objects from the zeo server (much slower than before). I
understand that the objects need to be
Victor Safronovich wrote at 2005-10-21 14:54 +0600:
...
app = Zope.bobo_application()
try:
self.running = True
while self.running:
get_transaction().begin()
try:
scheduler = app.unrestrictedTraverse(
Erik A. Dahl wrote at 2005-10-21 15:43 -0400:
The ZODB cache lives in RAM and is a Python object cache.
It is a per connection cache.
The ZEO client cache lives on disk and is a pickle cache (it
caches the object states not the objects themselves).
It is shared by all connections to a single
Paul Winkler wrote at 2005-10-21 16:24 -0400:
...
Why do you want to use the same zope.conf, and how can that possibly work
anyway?
You can't run two servers on the same port!
He might use the same configuration file on different hosts.
And I posted a ZConfig extension that allows to read the
Daniel wrote at 2005-10-31 09:52 +0100:
...
It seems that the restrictedTraverse method changes the request, doesn't it?
It uses locally its own request object. You will see it only
in __bobo_traverse__ methods during the restrictedTraverse.
All objects (in the standard acquisition context)
Andre Meyer wrote at 2005-10-25 23:12 +0200:
I am not sure whether ZODB is the right thing to use for my needs. So,
what do I want?
I have a number of threaded objects that have a context as a separate
entity. The object and context need to be separated to allow for the
threads to run
Chris Withers wrote at 2005-10-25 13:11 +0100:
...
The alias I suggested is purely to mirror that of the oid_repr function,
and I would include it directly above of below the oid_repr function
with bigger documentation clues for blind people like me ;-)
Does anyone have any non-pedantic
Chris Withers wrote at 2005-10-25 12:29 +0100:
Dieter Maurer wrote:
And I posted a ZConfig extension that allows to read the environment
(thus using environment variables in the configuration file).
Did you talk to the ZConfig maintainer about merging this?
I announced it and I think I have
Tim Peters wrote at 2005-11-1 15:00 -0500:
...
I don't want to see any renaming, or aliasing, until the docs (comments
docstrings) are clear.
Usually, I am convinced that well chosen names form the largest part
of the required documentation.
That's why I sometimes call things bugs (do not
Tim Peters wrote at 2005-11-3 12:31 -0500:
...
But those details are all artifacts of exactly how your test case is
written. As a general rule, if you do a rollback _beyond_ the creation of a
new persistent object P, you shouldn't expect P to be in a useful state
anymore (and, as you've seen,
Jim Fulton wrote at 2005-11-6 11:22 -0500:
Dieter Maurer wrote:
You should file a bug report: http://www.zope.org/Collectors/Zope;,
category database. This way, Tim can fix the hole in the
ConnectionStateError check.
It's a mistake to rely on Tim alone to fix bugs.
Maybe, it is a mistake
Tarek Ziadé wrote at 2005-11-14 17:59 +0100:
...
I am trying to create my own mount point container type,
do I just have to base it on ZODBMountPoint.Mount.MountPoint,
MountPoint is not a mount point container but the actual mount point.
In what way should your new mount point container be
Paolo Linux wrote at 2005-11-17 10:23 +0100:
...
I suspect that in some cases we do not manage Conflict
Error (we retry for 3 times but then we give up...).
Could this be connected with POSKeyErrors?
It should not. Because giving up should mean you abort the
transaction and your transaction
Tim Peters wrote at 2005-11-18 10:02 -0500:
[Margie Watkins CONT]
The issue http://www.zope.org/Collectors/Zope/1695 asks for a statement
from users who are affected by the missing modules.
Unfortunately, that's become out of sight, out of mind since then -- the
issue was opened 9 months ago,
Alex Couper wrote at 2005-11-25 16:30 +:
I am having trouble creating connections from different threads to my zodb.
In the main thread, I create/get the database using this:
storage=FileStorage('my.fs')
db=DB(storage)
The main thread subsequently creates other threads, and I would like
Chris Withers wrote at 2005-11-29 14:33 +:
Hot on the heals of my posts about Shouldn't load state for comes the
eagerly awaited sequel Couldn't load state for ;-)
...
File lib/python/ZEO/zrpc/connection.py, line
531, in call
r_flags, r_args = self.wait(msgid)
File
Chris Spencer wrote at 2005-12-4 16:32 -0500:
Is there an existing way to search for objects in ZODB based on
criteria?
The ZODB by itself does not provide searching facilities.
There are applications on top of the ZODB that do:
* Andreas already told you about Zope's ZCatalog
* there
Victor Safronovich wrote at 2005-12-9 14:33 +0500:
...
But when T2
still not commiting its transaction, dispatcher not see new element :(.
Any transaction will only see committed changes.
Only at transaction boundaries will a connection cache be updated
for modifications by other transactions.
Victor Safronovich wrote at 2005-12-9 12:05 +0500:
Hello zodb-dev!
Is this a correct behaviour?
from BTrees.IIBTree import IIBTree
t = IIBTree(map(None,range(5),range(5)))
list(t.keys())
[0, 1, 2, 3, 4]
k = t.keys()
list(k)
[0, 1, 2, 3, 4]
del t[0]
list(k)
[]
BUT
i = iter(t.keys())
del
Tim Peters wrote at 2005-12-9 10:46 -0500:
...
I'm not sure where the
code actually relies on stringness
The cPickleCache explicitely checks for stringness.
Not, that this were necessary. It just does.
--
Dieter
___
For more information about ZODB,
Victor Safronovich wrote at 2005-12-10 13:37 +0500:
...
Have you some situations, when you need to know if transaction
of
thread1 commited, but you are in thread2? In other words How can i receive
the
signal that transaction in another thread commited( or aborted, but
Tim Peters wrote at 2005-12-14 12:05 -0500:
...
return self.rpc.call('tpc_begin', id, user, descr, ext, tid, status)
File lib/python/ZEO/zrpc/connection.py, line 536, in call
raise inst # error raised by server
StorageTransactionError: Multiple simultaneous tpc_begin requests
Dennis Allison wrote at 2005-12-14 12:58 -0800:
...
_p_resolveConflict(self, oldState, savedState, newState)
returns the state of the object after resolving different changes. The
arguments are:
oldState -- state of the object at the beginning of the current
transaction
Tim Peters wrote at 2005-12-29 11:28 -0500:
...
Or there are no strong reference to `obj`, but `obj` is part of cyclic
garbage so _continues to exist_ until a round of Python's cyclic garbage
collection runs.
And this is *VERY* likely as any persistent object in the cache
has a (strong, I
Monica chopra wrote at 2005-12-29 18:17 -0800:
I have recently jumped into python and ZODB . I am quiet familar to syntax
and everything but there is one Issue . when we create a .fs file or say
data.fs and saves in it some objects.If we open this file in notepad or other
editior. It shows
Tim Peters wrote at 2005-12-29 12:59 -0500:
...
[Tim Peters]
It means that _ConnectionPool no longer has a reason to remember
anything about that Connection. Application code can continue
keeping it alive forever, though.
[Denis Markov]
But what about RDB-Connection what stay in cache
Please always stay on the list!
Monica chopra wrote at 2005-12-30 19:22 -0800:
...
Thanks for responding but can clarify more about how to do that. How can i
make an ecrypted file.
...
Dieter Maurer [EMAIL PROTECTED] wrote:
Monica chopra wrote at 2005-12-29 18:17 -0800:
...
It would
Tim Peters wrote at 2005-12-30 14:51 -0500:
[Dieter Maurer]
They did not tell us about their application. But, Zope's database
adapters work like this. They use the ZODB cache (and its pool) as an RDB
connection pool. Thus, if the ZODB caches are not released, the RDB
connections won't.
I
David Rushby wrote at 2005-12-30 11:14 -0800:
...
Since ZODB doesn't know whether the connection it's releasing from the
pool is still in use, I don't know whether resetting the connection's
cache is appropriate as a general solution. But it fixes a definite
problem with Zope's behavior as a
José Carlos Senciales wrote at 2006-1-3 12:28 +0100:
I´m wondering if i can use ZODB without files ´Data.fs´ and use a ralational
database like Mysql to save the objects...
is this possible??
Maybe, you can look at APE?
--
Dieter
___
For more
Tim Peters wrote at 2006-1-2 15:05 -0500:
I'm still baffled by how you get into this state to begin with. Florent
explained why earlier, and I didn't see a reply to this part:
[Florent Guillaume]
By itself Zope never uses more than one connection per thread, and the
number of thread is
Tamas Hegedus wrote at 2006-1-4 14:38 -0500:
You have released the ZODB/ZEO as a stand alone package. But there is no
stand alone searching possibility. Why? This just does not make any sense.
Yous suggested and I tried Kevin Dangoor's stand alone ZCatalog. It uses
the Zope source just remove
Jim Fulton wrote at 2006-1-13 17:54 -0500:
...
This means that interrupting ZEO while it is sending invalidation messages
can cause inconsitent states in the ZODB caches of its clients.
What do you mean by inconsistent states? Do you mean inconsistent
between clients?
The inconsistent ZEO
Chris Withers wrote at 2006-1-24 13:41 +:
Okay, now that we have 2.8.4 in place, we get proper reporting of
ConflictErrors and today we started seeing one happening over and over
again which looked roughly as follows:
Traceback (most recent call last):
File
Jürgen Herrmann wrote at 2006-1-25 11:00 +0100:
hi!
after upgrading to zope 2.9 i receeive the following errors for about
20-30s after restart:
2006-01-25 10:54:16 ERROR ZODB.lock_file Error locking file
/home/bliss/zope/var/bliss_data.fs.lock
Traceback (most recent call last):
File
Mihai Ilinca wrote at 2006-1-26 15:10 +0200:
...
Trough 'slave' I only do read operations at the moment. If I make changes to
the stored data trough the 'main' client, the 'slave' clients don't see it.
They only see the data as it was when the ClientStorage was constructed. If I
restart a
Jeff Bauer wrote at 2006-2-8 08:59 -0600:
Where are the runzero.py options documented?
At the top of the source file .../ZEO/runzeo.py
--
Dieter
___
For more information about ZODB, see the ZODB Wiki:
http://www.zope.org/Wikis/ZODB/
ZODB-Dev
Chris McDonough wrote at 2006-3-2 22:03 -0500:
...
The ZODB egg
might include both ZODB and ZEO (these are linked inextricably) which
depends on the persistence distribution. Transaction should be
dependency-free (but probably isn't, I haven't gotten that far yet).
While ZEO is of no use
Matt Hahnfeld wrote at 2006-3-13 14:33 -0500:
...
I found your code a while back and actually looked it over quit a bit
before I started coding the solution I attached. Would you be able to
explain how it works?
It works through a special HistoryJar (for some unknown reason,
the ZODB uses jar
Thomas Güttler wrote at 2006-3-15 11:30 +0100:
...
But I would like to know,
why the __import__ does not raise an ImportError, but instead returns a
half imported module.
A buglet in Python, fixed from version 2.4 on.
--
Dieter
___
For more
Chris McDonough wrote at 2006-3-18 20:58 -0500:
If yaml (or pysyck) supports all of the features of pickle, it's
theoretically possible. You would need to track down all of the
places in ZODB where the code serializes and deserializes data from
pickle format and write alternate
Antonio Beamud Montero wrote at 2006-3-22 10:56 +0100:
...
If I exectue a .minimizeCache(), then the output is:
[['request.Request', 504]]
But I can't minimize more the cache...
Looks as if your application keeps references to your request.Request
objects. Check where and get rid of them.
--
Antonio Beamud Montero wrote at 2006-3-23 09:26 +0100:
...
But my server doesn't free any memory, now it uses 55Mb of resident
size... How I can debug this references?
It has no chance -- and this is neither the fault of Python nor
of the ZODB but of C's standard memory management:
C does
Stoons - Headnet wrote at 2006-3-29 13:06 +0200:
...
Of cause I have tried to del / manage_delObjects it, but both times
ZODB.POSException.POSKeyError: 0x06f21b was returned in both cases
I ran the following:
===
o = app['kristendom']['medier']['billeder']['image.2006-03-19.5540330656']
Hi Tim,
Tim Peters wrote at 2006-3-31 18:48 -0500:
...
What is the motivation to request synchronized transaction completion
by default?
Primarily so we could stop seeing endless threads on zodb-dev asking
why ZEO clients that didn't happen to modify any objects never saw
current data. From
Chris Withers wrote at 2006-4-18 08:34 +0100:
...
If having two isn't acceptable, then why do we have an I and O BTree's,
not to mention the special ones used for in-memory ZODB indexes? Surely
we should just have one BTree class?
Using I versus O BTrees makes a huge difference for mass
Arve Knudsen wrote at 2006-4-23 22:44 +0300:
I already use ZODB as a local persistency service for my Python
application, now I'm considering ZEO as a distributed data source. The
thing is I don't want to keep my local object cache synchronized at all
times with the remote database, my
John Belmonte wrote at 2006-4-22 19:13 -0400:
...
I'm attempting to dust off my old high-write ZODB/ZEO app, and am having
a hard time tracking down a problem. Something goes very wrong in the
case where I catch a write conflict, abort the transaction, and attempt
a retry. Frequently it appears
Jim Fulton wrote at 2006-4-24 10:48 -0400:
...
I would like to have this. I can't find a proposal for it, so I
guess we should start with that, I'll note that I'd like to have an
interface like:
oidIterator(class_glob='*')
Returns an iterable of object ids whose dotted class names
Arve Knudsen wrote at 2006-4-25 17:32 +0300:
...
How should I ensure local
ownership of objects from the ClientStorage, by deep copying them?
The ZODB does not have any ownership concept.
Zope, on the other hand has two: executable ownership
and local role ownership.
Executable ownership
Arve Knudsen wrote at 2006-4-25 22:07 +0300:
I must say I'm not an expert on all things ZODB/ZEO, but what I meant by
ownership is the management of persistent objects. The cache management
logic of ZODB can the way I understand it ghostify objects, what happens
if I insert an object from
Arve Knudsen wrote at 2006-4-26 21:53 +0300:
...
Well, this is pretty obvious if I deep copy the objects of course. What
happens if I insert references to objects contained in the ZEO-served
database into another database, though, will they be controlled by this
second database (or the
Michael Havard wrote at 2006-5-1 06:57 -0500:
Python 2.3.5, Zope 2.8.4, Plone 2.1.2, and a host of other products. ZEO
configuration. Persistent disk caching is on.
Yesterday everything was fine. All the content was there and accessible.
Today I try to log in and the server doesn't respond. I go
Chris Withers wrote at 2006-5-1 11:34 +0100:
...
...well, there are .zec files in the var directory, so I guess I must
be. What controls whether a persistent or temporary client cache is used?
Your Zope configuration file, of course ;-)
It is the client option of the zeoclient section.
You
Pedro Werneck wrote at 2006-5-23 20:24 -0300:
...
The problem is... I can't see the committed changes from the main
thread, unless I do a commit there too, which seems strange.
You see modifications only after crossing a transaction boundary.
In the same transaction, you see only the
Pascal Peregrina wrote at 2006-5-24 09:57 +0100:
...
I have a question regarding what triggers the reloading of an object
state from ZODB (in order to set the most up to date one).
There is only one reason: that it is not in the cache or a ghost.
At transaction boundaries (and only there!)
Please stay on the mailing list -- readded.
Pedro Werneck wrote at 2006-5-25 21:33 -0300:
...
You see modifications only after crossing a transaction boundary.
In the same transaction, you see only the modification made by
this transaction (not by others, even committed).
OK... so, how can I
Hi Sidnei,
Sidnei da Silva wrote at 2006-5-26 13:37 -0300:
On Thu, May 25, 2006 at 02:41:32AM -0300, Sidnei da Silva wrote:
| Anyone experienced this? Any clues about what to do to get more
| information?
/me still expecting Dieter Maurer's I've fixed this in my private
copy of Zope by doing X,
[EMAIL PROTECTED] wrote at 2006-5-30 15:17 -0700:
I would be very helpful if someone could summarize what needs to be done to
get this to work. I don't have any experience with the ZEO server so any input
would be greatly appreciated.
There is a standard FileStorage documentation which tells
I fear we may get a ZODB cache inconsistency after a client disconnect.
The current reconnection protocol essentially works as follows:
* ClientStorage detects a broken ZEO connection
and starts a reconnect thread
* The reconnect thread tries to reconnect to the ZEO server
and
Florent Guillaume wrote at 2006-6-20 16:35 +0200:
Is it ok if I add the following comments to Connection's docstring?
I do not think they should become part of the class' docstring.
Having comments at the place where the attributes are introduced
(which are used for other attributes) would be
Chris Withers wrote at 2006-6-20 07:31 +0100:
...
But, there also seems to be (to my untrained eye) random periods of
slowness from then onwards, again, without any apparent signs of excess
load, memory usage or disk i/o.
I'm somewhat flumoxed as to where to go from here on the debugging
Eino Mäkitalo wrote at 2006-6-22 13:06 +0300:
What is the best document about ZODB internals?
Questions with respect to the best are always very difficult...
I can and will read code but are there any good documentation to
understand ideas why it's implemented that way.
There are the
Jean Jordaan wrote at 2006-6-23 16:24 +0200:
... write conflicts by large transactions ...
To mitigate this, we want to create a savepoint and then commit more often
while iterating and changing workflow, rolling back to the savepoint if
necessary.
I fear this will not work -- at least not when
Roché Compaan wrote at 2006-6-22 21:53 +0200:
...
What overhead does undo add to performance?
Very few -- apart from a fast growing storage file.
However, the log behaviour of FileStorage means that
you get a very different notion of locallity.
In a relational database, records in the same
Adam Groszer wrote at 2006-6-23 14:27 +0200:
...
Some fears they are having and I can't find unambiguous information:
- Is ZODB a good choice for this app?
It depends...
At least careful design is necessary!
The most problematic aspects of the ZODB are write conflicts.
When two concurrent
Roché Compaan wrote at 2006-6-24 08:53 +0200:
...
I am curious what other strategies besides QueueCatalog you employ?
Careful design with respect to the granularity and locality
of persistent objects:
Move groups of large and rarely used attributes out
into persistent subobjects.
Move
Roché Compaan wrote at 2006-6-23 19:04 +0200:
...
In a test where one commits an instance of a Persistent
subclass that have only 2 string attributes, 300 objects per second are
created on average. Writing the exact same strings to a two column table
in an RDBMS, yields more than 3000 records per
Roché Compaan wrote at 2006-6-25 11:13 +0200:
...
Careful design with respect to the granularity and locality
of persistent objects:
Move groups of large and rarely used attributes out
into persistent subobjects.
Will this lead to smaller transaction sizes for objects that store large
Hallo Florent,
Florent Guillaume wrote at 2006-6-26 00:53 +0200:
Dieter Maurer wrote:
Chris Withers wrote at 2005-12-14 16:23 +:
...
File lib/python/ZODB/Connection.py, line
788, in _setstate_noncurrent
assert end is not None
AssertionError
This means that the latest
Chris Withers wrote at 2006-6-27 09:56 +0100:
Dieter Maurer wrote:
PostGres does use looks, lots of them and for different purposes.
Could ZODB use locks to gain a similar performance boost?
Maybe, but it would be a really big change...
However, as I explained in an earlier message, the major
[EMAIL PROTECTED] wrote at 2006-6-29 11:05 -0400:
...
2006-06-28T17:18:38 INFO ZODB.Conflict database conflict error (oid 0x0300bc,
class BTrees._OOBTree.OOBTree, serial this txn started with 0x036671be9feda500
2006-06-28 21:18:37.483195, serial currently committed 0x036671bea30a9dee
Christian Theune wrote at 2006-7-13 17:13 +0200:
...
Is there any ability in ZODB to retroactively wrap objects in a
persistence mechanism instead of having to rewrite an entire library
to use the Persistent class?
You can always persist (almost) any object, even if it does not subclass
from
Chris S wrote at 2006-7-25 23:40 -0400:
The problem is the only objects I need to grab are the ones loaded by
other connections. I use Python's garbage collector to track
references to instances of classes that have been updated.
Use a customized ZODB.Conntection.Connection class instead.
Chris S wrote at 2006-7-26 16:03 -0400:
...
When a file containing source code is modified, I want to reload it
using Python's reload() function, then update classes with the new
definitions. I have application-level logic to ensure the objects are
in a sane-state during update. The only problem
1 - 100 of 250 matches
Mail list logo
