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#3680 sp_BlitzIndex stats sampling #3698

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Merged
merged 1 commit into from
Aug 28, 2025
Merged

#3680 sp_BlitzIndex stats sampling #3698

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48 changes: 28 additions & 20 deletions sp_BlitzIndex.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -175,6 +175,12 @@ BEGIN
RETURN;
END;

IF(@UsualStatisticsSamplingPercent <= 0 OR @UsualStatisticsSamplingPercent > 100)
BEGIN
RAISERROR('Invalid value for parameter @UsualStatisticsSamplingPercent. Expected: 1 to 100',12,1);
RETURN;
END;

IF(@OutputType = 'TABLE' AND NOT (@OutputTableName IS NULL AND @OutputSchemaName IS NULL AND @OutputDatabaseName IS NULL AND @OutputServerName IS NULL))
BEGIN
RAISERROR(N'One or more output parameters specified in combination with TABLE output, changing to NONE output mode', 0,1) WITH NOWAIT;
Expand Down Expand Up @@ -4555,26 +4561,6 @@ BEGIN
)
OPTION ( RECOMPILE );

RAISERROR(N'check_id 126: Persisted Sampling Rates (Expected)', 0,1) WITH NOWAIT;
INSERT #BlitzIndexResults ( check_id, Priority, findings_group, finding, [database_name], URL, details, index_definition,
secret_columns, index_usage_summary, index_size_summary )
SELECT 126 AS check_id,
200 AS Priority,
'Statistics Warnings' AS findings_group,
'Persisted Sampling Rates (Expected)',
s.database_name,
'https://www.youtube.com/watch?v=V5illj_KOJg&t=758s' AS URL,
CONVERT(NVARCHAR(100), COUNT(*)) + ' statistic(s) with a persisted sample rate matching your desired persisted sample rate, ' + CONVERT(NVARCHAR(100), @UsualStatisticsSamplingPercent) + N'%. Set @UsualStatisticsSamplingPercent to NULL if you want to see all of them in this result set. Its default value is 100.' AS details,
s.database_name + N' (Entire database)' AS index_definition,
'N/A' AS secret_columns,
'N/A' AS index_usage_summary,
'N/A' AS index_size_summary
FROM #Statistics AS s
WHERE ABS(@UsualStatisticsSamplingPercent - s.persisted_sample_percent) <= 0.1
AND @UsualStatisticsSamplingPercent IS NOT NULL
GROUP BY s.database_name
OPTION ( RECOMPILE );

RAISERROR(N'check_id 92: Statistics with NO RECOMPUTE', 0,1) WITH NOWAIT;
INSERT #BlitzIndexResults ( check_id, Priority, findings_group, finding, [database_name], URL, details, index_definition,
secret_columns, index_usage_summary, index_size_summary )
Expand Down Expand Up @@ -5666,6 +5652,28 @@ BEGIN



RAISERROR(N'check_id 126: Persisted Sampling Rates (Expected)', 0,1) WITH NOWAIT;
INSERT #BlitzIndexResults ( check_id, Priority, findings_group, finding, [database_name], URL, details, index_definition,
secret_columns, index_usage_summary, index_size_summary )
SELECT 126 AS check_id,
200 AS Priority,
'Statistics Warnings' AS findings_group,
'Persisted Sampling Rates (Expected)',
s.database_name,
'https://www.youtube.com/watch?v=V5illj_KOJg&t=758s' AS URL,
CONVERT(NVARCHAR(100), COUNT(*)) + ' statistic(s) with a persisted sample rate matching your desired persisted sample rate, ' + CONVERT(NVARCHAR(100), @UsualStatisticsSamplingPercent) + N'%. Set @UsualStatisticsSamplingPercent to NULL if you want to see all of them in this result set. Its default value is 100.' AS details,
s.database_name + N' (Entire database)' AS index_definition,
'N/A' AS secret_columns,
'N/A' AS index_usage_summary,
'N/A' AS index_size_summary
FROM #Statistics AS s
WHERE ABS(@UsualStatisticsSamplingPercent - s.persisted_sample_percent) <= 0.1
AND @UsualStatisticsSamplingPercent IS NOT NULL
GROUP BY s.database_name
OPTION ( RECOMPILE );



END /* IF @Mode = 4 */


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