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CMS-XML Check For Concurrency Error when validating a workflow transition
Check For Concurrency Error when validating a workflow transition
CMS-XML Transaction was deadlocked... during concurrency actions: Copy Dimension and modifying of Financial Details.
Transaction was deadlocked... during concurrency actions: Copy Dimension and modifying of Financial Details.
CMS-XML Inconsistent behaviour of cross appl concurrent checkout between ISPF and batch requests
However, if any type of batch checkout is attempted (i.e. using the ISPF Checkout Mode 2 or an XML request) then cross application checkouts also fail for concurrency reasons: CHECKOUT DISALLOWED/CMN2450A - Concurrent checkout disallowed - <comp.type> is in <package>. This consistency issue is a defect.
CMS-XML Orchestrations seem to are blocking each other since upgrade to from 2008 R2 to 2009 R1
SET READ_COMMITTED_SNAPSHOT ON MS SQL server isolation level by default is Read Committed (No Dirty Read) but it poses stricter pessimistic concurrency model (meaning share lock on every read operation, which results in deadlock behavior in heavy transactional cases). By changing it to Read Committed Snapshot ON read operations are more optimistic by using readonly (tempdb) database for versioning (no shared lock used).

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