I am not going to rehash what has already been said although these high level points are worth noting to resolve them:ġ) Examine known Parallelism (where you have parallelized jobs)Ģ) Examine unknown Parallelism (unknown jobs or users interfere with your jobs in parallel)ģ) Arrange order of tables doing DML to be the same across all code. If you need a refresher, I recommend this good article. We know what deadlocks are and some of the common reasons they happen. Unfortunately, I don’t have the deadlock graph to show. The difference from what I understand in this StackExchange question is that the former is caused by intra-query parallelism. Notice that this is slightly different from a similar error belowĮrror 1205 : Transaction (Process ID) was deadlocked on resources with another process and has been chosen as the deadlock victim. Transaction (Process ID) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. Recently, the job kept failing with the below error: As it runs, it maintains the fetch status/result of every operation in database tables which can be consulted if something were to go wrong. It is actually a PowerShell job that runs every night in parallel to collect the data from hundreds of instances (both SQL Server and Oracle). 1 (X64)ĭeveloper Edition (64-bit) on Windows Server 2019 Datacenter 10.I have a nightly SQL Agent job that aggregates backup information from system views to power a Power BI dashboard that the DBA’s review periodically for database backup failures. Some extra environment information: Microsoft SQL Server 2019 (RTM-CU18) (KB5017593). We have double-checked the database configuration settings of the application to ensure that no specific settings related to deadlocks were enabled. We are unsure of how to approach this issue, since the cause is unknown to us, but we can definitively confirm that it is specific to our application. Its cpu_time keeps growing a by a couple of milliseconds every 10 seconds.įinally, here is the result of running sp_who2 for the affected database: There are 3 differences, but they are only in the waittime values:Īdditionally, from the sys.dm_exec_requests, we see that the deadlock victim (spid = 223) is never actually stopped. The deadlock graph XML: int)SELECT t2.ID, t2.BAT_RUNTIME_SECONDS, t2.BATCH_ID, t2.READS, t2.CUTOFF, t2.CREATION_DATE, t2.DATA_HASH, t2.ENDTIME, t2.ENABLED, t2.DATA_ID, t2.ANALYSIS_DATA, t2.LAST_CHANGE, t2.NAME, t2.REF_ID, t2.UNIQUE_ID, t2.CONV_DATA, t2.PREVIOUS_GROUP_ID, t2.ANALYSIS_ID, t2.GROUP_ID FROM BAT_DATA_TASK t2 LEFT OUTER JOIN (BAT_DATA_COMPONENT t3 JOIN BAT_DATA_TASK_STATE t4 ON (t4.ID = t3.ID)) ON (t3.ID = t2.PREVIOUS_GROUP_ID), BAT_DATA t5, BAT_DATA_TASK_STATE t1, BAT_DATA_COMPONENT t0 WHERE ((((((t2.GROUP_ID = AND (t2.ANALYSIS_ID = AND (t2.BATCH_ID IS NULL)) AND (t2.ENABLED = AND ((t2.CUTOFF IS NULL) OR ((t2.CUTOFF IS NOT NULL) AND (t2.CUTOFF < AND (((t0.ID = t2.GROUP_ID) AND ((t1.ID = t0.ID) AND (t0.COMPONENT_TYPE = AND (t5.ID = t2.ANALYSIS_ID))) ORDER BY COALESCE(t2.ENDTIME, ASC, t2.LAST_CHANGE ASC OFFSET ROWS int)SELECT t2.ID, t2.BAT_RUNTIME_SECONDS, t2.BATCH_ID, t2.READS, t2.CUTOFF, t2.CREATION_DATE, t2.DATA_HASH, t2.ENDTIME, t2.ENABLED, t2.DATA_ID, t2.ANALYSIS_DATA, t2.LAST_CHANGE, t2.NAME, t2.REF_ID, t2.UNIQUE_ID, t2.CONV_DATA, t2.PREVIOUS_GROUP_ID, t2.ANALYSIS_ID, t2.GROUP_ID FROM BAT_DATA_TASK t2 LEFT OUTER JOIN (BAT_DATA_COMPONENT t3 JOIN BAT_DATA_TASK_STATE t4 ON (t4.ID = t3.ID)) ON (t3.ID = t2.PREVIOUS_GROUP_ID), BAT_DATA t5, BAT_DATA_TASK_STATE t1, BAT_DATA_COMPONENT t0 WHERE ((((((t2.GROUP_ID = AND (t2.ANALYSIS_ID = AND (t2.BATCH_ID IS NULL)) AND (t2.ENABLED = AND ((t2.CUTOFF IS NULL) OR ((t2.CUTOFF IS NOT NULL) AND (t2.CUTOFF < AND (((t0.ID = t2.GROUP_ID) AND ((t1.ID = t0.ID) AND (t0.COMPONENT_TYPE = AND (t5.ID = t2.ANALYSIS_ID))) ORDER BY COALESCE(t2.ENDTIME, ASC, t2.LAST_CHANGE ASC OFFSET ROWS int)DELETE FROM BAT_DATA_TASK WHERE (ID IN is a comparison of 3 deadlocks at: We are unsure what is causing this, and don’t understand why the transaction for the deadlock victim spid isn’t being rolled back? It selects the same spid as deadlock victim every time, but even the selected spid keeps running as well and holds many locks. It logs a deadlock about every 5 seconds, but unexpectedly, all spids involved in the deadlock keep running indefinitely. We are experiencing an issue with Microsoft SQL Server where every few days of running our application against the database, it goes into a state where it keeps deadlocking.
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