Hi,
I have a cluster with 3 nodes: one Primary and two Secondaries. Two nodes have the same configuration (cpu, memory, sql server configurations) and they are used as primary (SQL1) and the first secondary (SQL2). When SQL2 is primary the server responds very
good, instead when SQL1 is primary the response times are 2-10 times greater. I checked the wait times. In top, on the first position is a wait type named XDESTSVERMGR. The query associated with this wait type is bellow.
Could I have some documentation (link, pdf) or could you explain me what means: XDESTSVERMGR, which kind of operations are the cause of this wait type?
Thank you
--(@_msparam_0 nvarchar(4000))SELECT *
INTO #tmpag_availability_groups
FROM master.sys.availability_groups
SELECT group_id,
replica_id,
replica_server_name,
create_date,
modify_date,
endpoint_url,
read_only_routing_url,
primary_role_allow_connections,
secondary_role_allow_connections,
availability_mode,
failover_mode,
session_timeout,
backup_priority,
owner_sid
INTO #tmpar_availability_replicas
FROM master.sys.availability_replicas
/* BEGIN ACTIVE SECTION (inserted by Ignite) */
SELECT group_id,
replica_id,
role,
operational_state,
recovery_health,
synchronization_health,
connected_state,
last_connect_error_number,
last_connect_error_description,
last_connect_error_timestamp
INTO #tmpar_availability_replica_states
FROM master.sys.dm_hadr_availability_replica_states
/* END ACTIVE SECTION (inserted by Ignite) */
SELECT replica_id,
join_state
INTO #tmpar_availability_replica_cluster_states
FROM master.sys.dm_hadr_availability_replica_cluster_states
SELECT arrc.replica_server_name,
COUNT(cm.member_name) AS node_count,
SUM(cm.member_state) AS member_state_sum,
SUM(cm.number_of_quorum_votes) AS quorum_vote_sum
INTO #tmpar_availability_replica_cluster_info
FROM
(
SELECT DISTINCT replica_server_name,
node_name
FROM master.sys.dm_hadr_availability_replica_cluster_nodes
) AS arrc
LEFT OUTER JOIN master.sys.dm_hadr_cluster_members AS cm
ON UPPER(arrc.node_name) = UPPER(cm.member_name)
GROUP BY arrc.replica_server_name
SELECT *
INTO #tmpar_ags
FROM master.sys.dm_hadr_availability_group_states
SELECT ar.group_id,
ar.replica_id,
ar.replica_server_name,
ar.availability_mode, (
CASE
WHEN UPPER(ags.primary_replica) = UPPER(ar.replica_server_name) THEN 1
ELSE 0
END) as role,
ars.synchronization_health
INTO #tmpar_availabilty_mode
FROM #tmpar_availability_replicas as ar
LEFT JOIN #tmpar_ags as ags
ON ags.group_id = ar.group_id
LEFT JOIN #tmpar_availability_replica_states as ars
ON ar.group_id = ars.group_id
AND ar.replica_id = ars.replica_id
SELECT am1.replica_id,
am1.role, (
CASE
WHEN (am1.synchronization_health is null) THEN 3
ELSE am1.synchronization_health
END) as sync_state, (
CASE
WHEN (am1.availability_mode is NULL)
OR (am3.availability_mode is NULL) THEN null
WHEN (am1.role = 1) THEN 1
WHEN (am1.availability_mode = 0
OR am3.availability_mode = 0) THEN 0
ELSE 1
END) as effective_availability_mode
INTO #tmpar_replica_rollupstate
FROM #tmpar_availabilty_mode as am1
LEFT JOIN
(
SELECT group_id,
role,
availability_mode
FROM #tmpar_availabilty_mode as am2
WHERE am2.role = 1
) as am3
ON am1.group_id = am3.group_id
DROP table #tmpar_availabilty_mode
DROP table #tmpar_ags
SELECT AR.replica_server_name AS [Name],
ISNULL(AR.availability_mode, 2) AS [AvailabilityMode],
ISNULL(AR.backup_priority, -1) AS [BackupPriority],
ISNULL(AR.primary_role_allow_connections, 4) AS [ConnectionModeInPrimaryRole],
ISNULL(AR.secondary_role_allow_connections, 3) AS [ConnectionModeInSecondaryRole],
ISNULL(arstates.connected_state, 2) AS [ConnectionState],
ISNULL(AR.create_date, 0) AS [CreateDate],
ISNULL(AR.modify_date, 0) AS [DateLastModified],
ISNULL(AR.endpoint_url, N'') AS [EndpointUrl],
ISNULL(AR.failover_mode, 2) AS [FailoverMode],
ISNULL(arcs.join_state, 99) AS [JoinState],
ISNULL(arstates.last_connect_error_description, N'') AS [LastConnectErrorDescription],
ISNULL(arstates.last_connect_error_number,-1) AS [LastConnectErrorNumber],
ISNULL(arstates.last_connect_error_timestamp, 0) AS [LastConnectErrorTimestamp],
CASE
WHEN arci.member_state_sum IS NULL
OR arci.node_count = 0 THEN 3
WHEN arci.member_state_sum = 0 THEN 0
WHEN arci.member_state_sum < arci.node_count THEN 2
WHEN arci.member_state_sum = arci.node_count THEN 1
ELSE 3
END AS [MemberState],
ISNULL(arstates.operational_state, 6) AS [OperationalState],
suser_sname(AR.owner_sid) AS [Owner],
ISNULL(arci.quorum_vote_sum, -1) AS [QuorumVoteCount],
ISNULL(AR.read_only_routing_url, '') AS [ReadonlyRoutingConnectionUrl],
ISNULL(arstates.role, 3) AS [Role],
ISNULL(arstates.recovery_health, 2) AS [RollupRecoveryState], (
CASE
WHEN arrollupstates.sync_state = 3 THEN 3
WHEN (arrollupstates.effective_availability_mode = 1
OR arrollupstates.role = 1) THEN arrollupstates.sync_state
WHEN arrollupstates.sync_state = 2 THEN 1
ELSE 0
END) AS [RollupSynchronizationState],
ISNULL(AR.session_timeout, -1) AS [SessionTimeout],
AR.replica_id AS [UniqueId]
FROM #tmpag_availability_groups AS AG
INNER JOIN #tmpar_availability_replicas AS AR
ON (AR.replica_server_name IS NOT NULL)
AND (AR.group_id=AG.group_id)
LEFT OUTER JOIN #tmpar_availability_replica_states AS arstates
ON AR.replica_id = arstates.replica_id
LEFT OUTER JOIN #tmpar_availability_replica_cluster_states AS arcs
ON AR.replica_id = arcs.replica_id
LEFT OUTER JOIN #tmpar_availability_replica_cluster_info AS arci
ON UPPER(AR.replica_server_name) = UPPER(arci.replica_server_name)
LEFT OUTER JOIN #tmpar_replica_rollupstate AS arrollupstates
ON AR.replica_id = arrollupstates.replica_id
--WHERE (AG.name=@_msparam_0)
ORDER BY [Name] ASC
DROP TABLE #tmpar_availability_replicas
DROP TABLE #tmpar_availability_replica_states
DROP TABLE #tmpar_availability_replica_cluster_states
DROP TABLE #tmpar_availability_replica_cluster_info
DROP TABLE #tmpar_replica_rollupstate
DROP table #tmpag_availability_groups