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 (https://ideas.ibm.com).


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Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.

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Status Not under consideration
Workspace Replication: Change Data Capture
Created by Guest
Created on May 11, 2017

RELATED IDEAS

CDC should be able to read Oracle logs with asynchronous read-ahead method

Oracle archive log reading needs improving.
This customer has to process around 2.4TB / day of Redo Logs.
Due to a number of reasons there are occasional replication stops/restarts. This makes the log readers to go back in time, forcing the read of archived logs from several hours back in time.
These files are obviously not in the file system cache. an AIX PMR (15361,999,822) was opened and I/O was analyzed and measured. The I/O operations were being processed in 1-2ms (we're using a 128KB block size in CDC)
So, assuming 1ms per I/O operation, we take 32s just to read a 4GB REDO log archive. This is synchronous, so we need to add the time to actually process the log.
The same system is able to create these logs in 30s or even less at peak times. So it's easy to understand we loose ground, and it gives a very narrow margin to recover from stops.

The request is to implement asynchronous read-ahead in CDC. This would allow the I/O to be done in parallel with the log processing, so the 32s mentioned above wouldn't be "waiting time", but instead would occur simultaneously with the log processing

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