Databases Reference
In-Depth Information
- - keep this to force a new optimization
OPTION
(
RECOMPILE
)
GO
SELECT
*
INTO
after_query_transformation_stats
FROM
sys
.
dm_exec_query_transformation_stats
GO
SELECT
a
.
name
,
(
a
.
promised
-
b
.
promised
)
as
promised
FROM
before_query_transformation_stats b
JOIN
after_query_transformation_stats a
ON
b
.
name
=
a
.
name
WHERE
b
.
succeeded
<>
a
.
succeeded
DROP
TABLE
before_query_transformation_stats
DROP
TABLE
after_query_transformation_stats
Listing 5-5.
For example, testing with a very simple
AdventureWorks
query like the following, which
is already included in the code in Listing 5-5 ...
SELECT
*
FROM
dbo
.
DatabaseLog
Listing 5-6.
... will show that the following transformation rules are being used.
name
promised
GetIdxToRng
1
GetToTrivialScan
1
Table 5-5.
