IBM Data and AI Ideas Portal for Clients

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We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

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IIDR CDC : PostgreSQL source, Provide microseconds precision to DM_TIMESTAMP

IIDRCDC for PostgreSQL Source is relatively new IBM product that replicates data from PostgreSQL database. In this particular scenario, source is PostgreSQL and target is flat file using IIDR CDC Datastage product.

IIDRCDC generates source commit timestamp from PostgreSQL WAL in the IIDR metadata variable "DM_TIMESTAMP" . IIDRCDC usually gets it from PostgreSQL WAL file. Currently IIDRCDC can get this timestamp only up to millisecond precisions instead of microsecond precision. Below is example of both values.

  • IIDRCDC PostgreSQL source : current Support.

  • milliseconds precision for DM_TIMESTAMP => 2020-08-31 10:10:42.466

  • IIDRCDC PostgreSQL source : Requested feature thru this request.

  • microsecond precision for DM_TIMESTAMP=> 2020-08-31 10:10:42.466137

Per IBM support, this is due to CDC for PostgreSQL is written in Java and there is a Java engine limitation for JCF &TIMSTAMP up-to millisecond only. This functionality is supported for CDC z source, where Engine is written in C programming language.

This is very useful timestamp to identify CDC patterns and exact transcations order in the source database and very useful in fraud detections and analytics. If source database has more than one DML transactions within few microseconds apart, IIDRCDC output would not able to differentiate it. As Most of OLTP or batch workload in the source databases are usually fractions of microseconds, this is very crucial functionality for IIDRCDC to have.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Oct 8 2020
  • Future consideration
Who would benefit from this IDEA? CDC use for Analytics and Fraud detections
How should it work?

This would be relatively easy to implement as PostgreSQL is already exposing microseconds timestamp in the WAL , IIDR CDC needs to update Java program to accommodate microseconds.

Idea Priority High
Priority Justification This is very crucial feature for fraud and analytics support.
Client Name Social Security Administration (SSA)
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