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IBM Data and AI Ideas Portal for Customers

This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (

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Status Not under consideration
Workspace Db2
Components Serviceability
Created by Guest
Created on Feb 9, 2015

Oracle-style isolation level 3 (multi-version read consistency) locking.(RIMS)

A description of Oracle's 'multi-version read consistency' can be found here: Even DB2's most liberal CS isolation is more strict then this. [update 04-27-2009]: Support for isolation level 3 queries that do not require a table-level lock or readers blocking writers - Oracle style reads from logs. This feature is not whats coming in Cobra (v97). IBM is providing a concurrency semantics in Cobra (v97) but not a RR consistent read because data can change after the query starts; today we use a combination of replication and lock table fast due to no row locks; new version of MS SQL, PostgreSQL also support this required for CRM; SAP uses its own internal lock manager because they use UR; (follow-up with greater detail on spec)
  • Guest
    Nov 27, 2019

    For sure this will bring a huge concurrence improvement and thus performance gain for DB2.