i'm trying to run this query:
SELECT COUNT(1) FROM MSGS m, MBOARD b WHERE b.BaseType = 0 AND m.BoardID
= b.BoardID;
MSGS has 9.5 million rows, and is indexed on BoardID
MBOARD has 69K rows and is indexed on BaseType
EXPLAIN shows:
mysql> explain SELECT COUNT(1) FROM MSGS m, MBOARD b WHERE b.BaseType =
0 AND m.BoardID = b.BoardID;
+-------+------+------------------+------------+---------+-----------+-------+-------------+
| table | type | possible_keys | key | key_len | ref |
rows | Extra |
+-------+------+------------------+------------+---------+-----------+-------+-------------+
| b | ref | PRIMARY,BaseType | BaseType | 1 | const |
48614 | |
| m | ref | BoardIndex | BoardIndex | 4 | b.BoardID |
277 | Using index |
+-------+------+------------------+------------+---------+-----------+-------+-------------+
the query takes several minutes to run. shouldn't this be a simple case
of doing some math on index values?
-jsd-
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