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Status Delivered
Workspace Informix
Components Informix Server
Created by Guest
Created on Jun 25, 2020

Clear Indication when RSS_FLOW_CONTROL or SDS_FLOW_CONTROL is actively applied

When RSS_FLOW_CONTROL or SDS_FLOW_CONTROL are set to a value other than -1 Informix will try to limit log activity on the primary server so that the secondary servers do not fall too far behind. There is no easy way to know or report on when this occurs.

For RS secondaries the only way to know if flow control is active is to look at the output of "onstat -g rss verbose".

For SD secondaries I see no documented method.

We have thousands (6,000) of users each with multiple sessions tending to our customers.

Our work around has been to disable RSS_FLOW_CONTROL to avoid performance issues on our production host and have noticed fewer complaints of slow downs since doing so.

A query was written to monitor if flow control was active but the sample rate would be to slow to always know when the issue was occuring.

The suggested corrective solution would be for the engine to clearly state when flow control is active.

Needed by Date Nov 20, 2020
  • Guest
    Jul 15, 2020

    This one was fixed in 14.10xC4. onstat -g rss verbose and onstat -g sds verbose now show these below details.

    Total number of delay(s)

    The total number of times the flow delay occurred.

    Time of last delay

    The time of last delay in flow control.