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add "smart stats" capability #580

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add "smart stats" capability #580

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18 changes: 16 additions & 2 deletions IndexOptimize.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -915,7 +915,7 @@ BEGIN

----------------------------------------------------------------------------------------------------

IF @StatisticsSample <= 0 OR @StatisticsSample > 100
IF @StatisticsSample <= -2 OR @StatisticsSample > 100
BEGIN
INSERT INTO @Errors ([Message], Severity, [State])
SELECT 'The value for the parameter @StatisticsSample is not supported.', 16, 1
Expand Down Expand Up @@ -2194,7 +2194,21 @@ BEGIN
SELECT 'FULLSCAN'
END

IF @CurrentStatisticsSample IS NOT NULL AND @CurrentStatisticsSample <> 100
IF @CurrentStatisticsSample IS NOT NULL AND @CurrentStatisticsSample = -1
BEGIN
INSERT INTO @CurrentUpdateStatisticsWithClauseArguments (Argument)
SELECT 'SAMPLE ' + CASE
WHEN @CurrentRowCount < 500000 THEN '100 PERCENT'
WHEN @CurrentRowCount < 1000000 THEN '50 PERCENT'
WHEN @CurrentRowCount < 5000000 THEN '25 PERCENT'
WHEN @CurrentRowCount < 10000000 THEN '10 PERCENT'
WHEN @CurrentRowCount < 50000000 THEN '2 PERCENT'
WHEN @CurrentRowCount < 100000000 THEN '1 PERCENT'
ELSE '3000000 ROWS '
END
END

IF @CurrentStatisticsSample IS NOT NULL AND @CurrentStatisticsSample BETWEEN 0 AND 99
BEGIN
INSERT INTO @CurrentUpdateStatisticsWithClauseArguments (Argument)
SELECT 'SAMPLE ' + CAST(@CurrentStatisticsSample AS nvarchar) + ' PERCENT'
Expand Down