[HACKERS] send()/receive() and on-disk storage
Hi, Currently, there's a discussion on the pljava list, and we're confused about a small detail: Does PostgreSQL call the datatypes' defined send() function before storing the tuple data in the table, on disk, and call receive() when reading it again? My position was that send()/receive() are only used for client communication in the V3 protocol binary mode, and COPY in binary mode, but the backend stores them in the tables as_is (modulo compression/ TOASTing). Is my assumption correct? Btw, I'm going to triple-check this in the source and via tests, too. Thanks, Markus -- Markus Schaber | Logical TrackingTracing International AG Dipl. Inf. | Software Development GIS Fight against software patents in Europe! www.ffii.org www.nosoftwarepatents.org signature.asc Description: OpenPGP digital signature
Re: [HACKERS] send()/receive() and on-disk storage
On Fri, Sep 29, 2006 at 03:44:07PM +0200, Markus Schaber wrote: Does PostgreSQL call the datatypes' defined send() function before storing the tuple data in the table, on disk, and call receive() when reading it again? No. My position was that send()/receive() are only used for client communication in the V3 protocol binary mode, and COPY in binary mode, but the backend stores them in the tables as_is (modulo compression/ TOASTing). Yes. It would be terribly inefficient to call those functions for each read/write. The disk has the internal format, send/receive deal with a portable not-host-dependant representation of the data. Have a nice day, -- Martijn van Oosterhout kleptog@svana.org http://svana.org/kleptog/ From each according to his ability. To each according to his ability to litigate. signature.asc Description: Digital signature
Re: [HACKERS] send()/receive() and on-disk storage
Hi, Martijn, Martijn van Oosterhout wrote: It would be terribly inefficient to call those functions for each read/write. The disk has the internal format, send/receive deal with a portable not-host-dependant representation of the data. Thanks. Markus -- Markus Schaber | Logical TrackingTracing International AG Dipl. Inf. | Software Development GIS Fight against software patents in Europe! www.ffii.org www.nosoftwarepatents.org signature.asc Description: OpenPGP digital signature
