isamchk doesn't use any more memory than you define with
the -O options. The default is to use only about 2M to fix
things. By using bigger values you can get isamchk to operate faster.
Using -O sortbuffer=16M should probably be enough for most cases.
But isamchk uses temporary files in TMPDIR. If
TMPDIR points to a memory file system you may easily get out of
memory errors.
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