Dhaval Shah wrote:
I do know that WAL files taken from a 64 bit OS will not work on a 32
bit OS. However I have to prepare a technical answer to this.
That is, questions like - why a WAL file from 64 bit will not work in
32 bit. Also does the WAL file differ for same architecture but
different kind of partitions?
The WAL files track on-disk changes. That is, they represent the bytes
changed in individual blocks. So - both machines will need to have
*identical* on-disk formats for the WAL transfer to work.
It can be something as small as a configuration option chosen when
compiling PostgreSQL. For example - you can change between
floating-point and integer date-times at ./configure time and if you use
different settings on two identical machines then the WAL files will be
incompatible.
The obvious incompatibility I'd expect in a 32 to 64-bit changeover
would be alignment of data fields to 32 or 64-bit boundaries. I've not
checked, but I'd be surprised if there wasn't some difference there.
--
Richard Huxton
Archonet Ltd
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