Mark Leith wrote:
And in practice, a 32bit binary is actually limited to around ~2.5-2.7G,
rather than a full 4G.

What are the practical memory limits for 64-bit binaries? I have heard that MySQL's indexing code is only 32-bit safe anyway, and I assume for example the MyISAM key buffers can still only be 4 GiB in a 64-bit version. Is this true of all storage engines? Are there any other gotchas trying to use lots of memory in 64-bit systems?

Thanks
Baron

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