Re: [Pytables-users] ordering and binding questions

2008-05-12 Thread Nick Bower
> > Well, I think that the HDF5 case is similar than the NetCDF for this > scenario: if you need to efficiently retrieve measurements that are > near in time, the best would be to save them in that order. However, in > order to take advantage of this (disk-sorted) arrangement, you will > need to

Re: [Pytables-users] ordering and binding questions

2008-05-12 Thread Francesc Alted
A Monday 12 May 2008, Nick Bower escrigué: > > 2. Has anyone contended with managing schema differences between > > sources? In other words, if I have say 500 loggers, each logging > > slightly different schemas (ie 100 different columns and so > > different table definitions), the suggested Pytabl

Re: [Pytables-users] ordering and binding questions

2008-05-12 Thread Francesc Alted
A Monday 12 May 2008, Nick Bower escrigué: > Hi - just investigating pytables from storing data from many > distributed remote logging stations, each logging about 100 channels > at 1 second frequency (a fair bit). > > My questions; > > 1. How does one handle ordering timeseries data within a table

Re: [Pytables-users] ordering and binding questions

2008-05-12 Thread Nick Bower
> 2. Has anyone contended with managing schema differences between sources? > In other words, if I have say 500 loggers, each logging slightly different > schemas (ie 100 different columns and so different table definitions), the > suggested Pytables way of binding static data definitions for each

[Pytables-users] ordering and binding questions

2008-05-11 Thread Nick Bower
Hi - just investigating pytables from storing data from many distributed remote logging stations, each logging about 100 channels at 1 second frequency (a fair bit). My questions; 1. How does one handle ordering timeseries data within a table? *Does* one actually order on the way in (eg re-sh