On 2010-03-08 11:17 +0200, Pierre C wrote:
> - index skip scans (well, MySQL doesn't really do index skip scans, but
> since it can do index-only scans, it's an approximation)
As far as I can tell, we already do index skip scans:
=> create index foo_a_b_idx on foo(a,b);
CREATE INDEX
=> explain analyze select * from foo where b = 2;
QUERY PLAN
---------------------------------------------------------------------------
Index Scan using foo_a_b_idx on foo (cost=0.00..20.30 rows=5 width=8)
(actual time=0.027..0.057 rows=1 loops=1)
Index Cond: (b = 2)
Total runtime: 0.075 ms
(3 rows)
Regards,
Marko Tiikkaja
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