Hi Steve & list!
The problem you faced are related to two kinds of improvements of the 2.2.0 release : 1) the compressing features; 2) the output buffering feature.
There is only one way to lower memory usage IMHO: to display dump statements one by one. It means that we should stop output buffering while building dump (easy to do) and create a temporary text file on the server that will contain the dump statements before to be compressed if compression mode is required.
It means we have to setup a directory that is readable and writable by the script where to put these temporary files.
Loïc
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