diff options
Diffstat (limited to 'sql/sql_const.h')
| -rw-r--r-- | sql/sql_const.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sql/sql_const.h b/sql/sql_const.h index b3412af31fe..1f9353cdef3 100644 --- a/sql/sql_const.h +++ b/sql/sql_const.h @@ -204,7 +204,11 @@ instead of reading with keys. The number says how many evaluation of the WHERE clause is comparable to reading one extra row from a table. */ -#define TIME_FOR_COMPARE 5 // 5 compares == one read +#define TIME_FOR_COMPARE 5 // 5 compares == one read +#define TIME_FOR_COMPARE_IDX 20 + +#define IDX_BLOCK_COPY_COST ((double) 1 / TIME_FOR_COMPARE) +#define IDX_LOOKUP_COST ((double) 1 / 8) /** Number of comparisons of table rowids equivalent to reading one row from a |