Jon Clements wrote: > Hi All. > > I'm using psycopg2 to retrieve results from a rather large query (it > returns 22m records); unsurprisingly this doesn't fit in memory all at > once. What I'd like to achieve is something similar to a .NET data > provider I have which allows you to set a 'FetchSize' property; it > then retrieves 'n' many rows at a time, and fetches the next 'chunk' > after you read past the end of the current chunk. I suppose I could > use Python for .NET or IronPython but I'd rather stick with CPython > 2.5 if possible.
psycopg2 is DB-API 2.0 [1]_ compliant, so you can use ``fetchmany`` method and set ``cursor.arraysize`` accordingly. [1] .. http://www.python.org/dev/peps/pep-0249/ -- HTH, Rob -- http://mail.python.org/mailman/listinfo/python-list
