A Tuesday 04 September 2007, Gabriel Beckers escrigué: > Hi, > > A question about ptrepack: if one copies Tables and/or VLArrays from > one file to a new one, does it calculate new chunkshapes on the basis > of the dimensions of these objects in the original file?
Yes, it does. > The thing is that I create pytables files, but do not always know > beforehand how many rows I will have. So I make a guess in setting > the expectedrows / expectedsizeinMB parameters when creating tables / > arrays. If that guess turns out to be off-the-mark, can I then use > ptrepack to create new and better files, or should I write a routine > that recreates tables / arrays with the (now known) expectedrows / > expectedsizeinMB parameters. (Off-the-mark here is something like: I > said it would be 200000 rows, but it turns out to be 500000.) Ptrepack (or a plain Leaf.copy() operation) should have in account the optimal sizes for copied leaves, so there is no need for you to recreate the tables/arrays manually. Cheers, -- >0,0< Francesc Altet http://www.carabos.com/ V V Cárabos Coop. V. Enjoy Data "-" ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Pytables-users mailing list Pytables-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pytables-users
