Extended Events and Consumer/Subscriber Delays


i'm having trouble understanding when , why extended events taking long delivered. max_dispatch_latency 3 seconds can wait indefinitely longer receive extended events. seems events long-running transactions/connections on given database withheld until transaction commits or rolls back.

is there specific requirement open transaction completed before xevents sent out?  or unintentionally introducing requirement special predicates on selected events?

what i'm observing when dig deeper sql profiler gets see events matter of minutes before xe session gets see them.  happens xe events having active transactions/connections still underway.  if transactions short-lived difference in delay between sql profiler , xe sessions negligible (ie. less max_dispatch_latency).

here example of xe session definition:

create

eventsession[abc]onserver

add

eventsqlserver.login(

   

action(sqlserver.client_app_name,sqlserver.client_hostname,sqlserver.database_id,sqlserver.database_name,sqlserver.nt_username,sqlserver.session_id,sqlserver.session_nt_username,sqlserver.sql_text,sqlserver.transaction_id,sqlserver.username)

   

where ([package0].[equal_boolean]([sqlserver].[is_system],(0))and[package0].[equal_uint64]([sqlserver].[database_id],(54))and[package0].[equal_i_unicode_string]([sqlserver].[database_name],n'reporttracking')and[package0].[not_equal_i_unicode_string]([sqlserver].[client_app_name],n'self data profiling transscrit'))),

　

 


-- ...

　

with

(max_memory=100000 kb,event_retention_mode=allow_single_event_loss,max_dispatch_latency=3 seconds,max_event_size=0 kb,memory_partition_mode=none,track_causality=on,startup_state=off)

go

i stumped @ point.  unfortunate xe events supposed allow me troubleshoot locks , timeouts having own bad case of locks/timeouts.

in activity monitor can see when delays occurring because wait time wait type "xe_dispatcher_wait" keeps increasing.  typically returns 0 when events delivered xe stream readers.  behavior of "xe_dispatcher_wait" same when database quiet (no events of nature requested).

once transactions/connections closed, can assured events delivered again.  appreciated.  i'm using sql 2012.  can't find references these xe event delays anywhere on google/stackoverflow.

david beavon

i use file target behaves according buffer- & dispatching configuration , seems more predictable.

actually tested , not phenomena more (sql 2012 sp2). remember though. maybe pre-sp1.

if server patched, must else in .net code/library , opening connect item repro might help

andreas wolter (blog | twitter)
mcsm: microsoft certified solutions master data platform, mcm, mvp
www.sarpedonqualitylab.com | www.sql-server-master-class.com



SQL Server  >  SQL Server Database Engine



Comments

Post a Comment

Popular posts from this blog

Conditional formatting a graph vertical axis in SSRS 2012 charts

Image
hi, i have situation want color label on vertical axis of graph depending on condition. when values positive color black , when negative color red. i tried following condition but not working.   =iif(fields!myfield.value < 0 , "red", "black") i know there few threads mentioning feature not supported in ssrs 2008 wanted know if adddressed in ssrs 2012 or later? thanks , regards, oliver d'mello hi oliver, according description, want use expression specify different color axis labels based on values in chart. as tested in our environment, when apply condition in expression give dynamic color axis labels, color setting applies labels based on condition. issue happens in both sql server 2012 , 2014. please refer screenshots below: in scenario, recommend submit issue microsoft connect @ link https://connect.microsoft.com/sqlserver/feedback . connect site serve connecting point between , microsoft, , large community , microsoft intera
Read more

Register with Power BI failed

hi all, i've running local report server , want configure power bi integration. sign in azure active directory , registering power bi clientapp validated, fails following error: microsoft.reportingservices.wmiprovider.wmiproviderexception: unknown error has occurred in wmi provider. error code 80131500  ---> system.exception: exception of type 'system.exception' thrown.    --- end of inner exception stack trace ---    at microsoft.reportingservices.wmiprovider.rswmiadmin.throwonerror(managementbaseobject mo)    at microsoft.reportingservices.wmiprovider.rswmiadmin.savepowerbiinformation(string clientid, string clientsecret, string appobjectid, string tenantname, string tenantid, string resourceurl, string authurl, string tokenurl, string redirecturls)    at reportservicesconfigui.wmiprovider.rsreportserveradmin.savepowerbiinformation(powerbiappconfiguration appconfig) i tried sql server agent solution  ( https://social.msdn.microsoft.com/forums/en-us/58
Read more

SQL server replication error Cannot find the dbo or user defined function........

hi there, i ran problem while deploying sql 2008 transactional replication between 2 servers lets assume server , b. actually created  both distributor , publisher on server , after created subscriber pointed server b, launch replication monitor , found big red cross. when click on tab "distributor subscriber history" error says "cannot find either column "dbo" or user defined-function or aggregate "dbo.ufnleadingzeros", or name ambiguous". can body regarding issue. regards, ishuv hi, you need compare data , others reseved, index size, unused should not compared. differs. here server - data - 87896 kb server b - data - 78152 kb server data size includes publication tables, can't compare directly. need check article article know exact data size. SQL Server  > 
Read more