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Add top blocking query finding to sp_HumanEventsBlockViewer #760

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Merged
erikdarlingdata merged 1 commit into from
Apr 10, 2026
Merged

Add top blocking query finding to sp_HumanEventsBlockViewer #760

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227 changes: 227 additions & 0 deletions sp_HumanEvents/sp_HumanEventsBlockViewer.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -3555,6 +3555,233 @@ BEGIN
b.host_name
OPTION(RECOMPILE);

IF @debug = 1
BEGIN
RAISERROR('Inserting #block_findings, check_id 9', 0, 1) WITH NOWAIT;
END;

WITH
blocker_waits AS
(
SELECT
b.database_name,
query_text_pre =
b.query_text_pre,
b.transaction_id,
sql_handle =
CONVERT
(
varbinary(64),
b.blocked_process_report.value
(
'(/event/data/value/blocked-process-report/blocking-process/process/executionStack/frame[not(@sqlhandle = "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")]/@sqlhandle)[1]',
'varchar(130)'
),
1
),
stmtstart =
ISNULL
(
b.blocked_process_report.value
(
'(/event/data/value/blocked-process-report/blocking-process/process/executionStack/frame[not(@sqlhandle = "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")]/@stmtstart)[1]',
'integer'
),
0
),
stmtend =
ISNULL
(
b.blocked_process_report.value
(
'(/event/data/value/blocked-process-report/blocking-process/process/executionStack/frame[not(@sqlhandle = "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")]/@stmtend)[1]',
'integer'
),
-1
),
wait_time_ms =
ISNULL
(
b.blocked_process_report.value
(
'(/event/data/value/blocked-process-report/blocked-process/process/@waittime)[1]',
'bigint'
),
0
)
FROM #blocks AS b
WHERE b.activity = 'blocking'
AND (b.database_name = @database_name
OR @database_name IS NULL)
AND (b.contentious_object = @object_name
OR @object_name IS NULL)
),
blocker_per_victim AS
(
SELECT
bw.database_name,
bw.sql_handle,
bw.stmtstart,
bw.stmtend,
bw.query_text_pre,
bw.transaction_id,
wait_time_ms =
MAX(bw.wait_time_ms)
FROM blocker_waits AS bw
WHERE bw.sql_handle IS NOT NULL
GROUP BY
bw.database_name,
bw.sql_handle,
bw.stmtstart,
bw.stmtend,
bw.query_text_pre,
bw.transaction_id
)
INSERT
#block_findings
(
check_id,
database_name,
object_name,
finding_group,
finding,
sort_order
)
SELECT
check_id =
9,
bpv.database_name,
object_name =
LEFT
(
REPLACE
(
REPLACE
(
ISNULL
(
MAX(bpv.query_text_pre),
N'[Unknown]'
),
NCHAR(13),
N' '
),
NCHAR(10),
N' '
),
200
),
finding_group =
N'Top Blocking Query',
finding =
N'This query caused ' +
CONVERT
(
nvarchar(30),
(
SUM
(
CONVERT
(
bigint,
bpv.wait_time_ms
)
) / 1000 / 86400
)
) +
N' ' +
CONVERT
(
nvarchar(30),
DATEADD
(
SECOND,
(
SUM
(
CONVERT
(
bigint,
bpv.wait_time_ms
)
) / 1000 % 86400
),
'19000101'
),
14
) +
N' of blocking wait time (' +
ISNULL
(
CONVERT
(
nvarchar(10),
CONVERT
(
decimal(5, 1),
100.0 *
SUM
(
CONVERT
(
bigint,
bpv.wait_time_ms
)
) /
NULLIF
(
SUM
(
SUM
(
CONVERT
(
bigint,
bpv.wait_time_ms
)
)
) OVER (),
0
)
)
),
N'0.0'
) +
N'% of total) across ' +
CONVERT
(
nvarchar(20),
COUNT_BIG(DISTINCT bpv.transaction_id)
) +
N' blocked sessions.',
sort_order =
ROW_NUMBER() OVER
(
ORDER BY
SUM
(
CONVERT
(
bigint,
bpv.wait_time_ms
)
) DESC
)
FROM blocker_per_victim AS bpv
GROUP BY
bpv.database_name,
bpv.sql_handle,
bpv.stmtstart,
bpv.stmtend
HAVING
SUM(CONVERT(bigint, bpv.wait_time_ms)) * 10 >=
(
SELECT
SUM(CONVERT(bigint, bpv2.wait_time_ms))
FROM blocker_per_victim AS bpv2
)
OPTION(RECOMPILE);

IF @debug = 1
BEGIN
RAISERROR('Inserting #block_findings, check_id 1000', 0, 1) WITH NOWAIT;
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