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Improvement in the check for high serial values

I'm trying to check if a serial value has reached its upper limit. I noticed the following unpleasant behaviour.

In the sysmaster tables sysptnhdr and sysactptnhdr the currently used serial values are in three fields for the datatypes serial, serial8 and bigserial.

If my serial approaches the upper limit for integer data types, the easiest way is to change it to a serial8 or bigserial.

During the alter table, the current value from serial is now copied into the column of the new type. Unfortunately the value of serial is not reset to 0 or NULL.

This means that a value check still reports a dangerously high serial value, even though the table no longer has this data type.

Since you can have both types serial and serial8/BigSerial in a table in parallel, you must now also check the syscolumns of the affected database to suppress this message.

At least for databases with non-english locale this is even more difficult, because you cannot access directly from sysadmin or sysmaster.

My suggestion is that only the field of the data type that is used is filled with the current serial value and the others are reset to 0 or NULL.

A repro for this behaviour can be found in the support case TS002868693.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Aug 14 2020
  • Not Under Consideration
Who would benefit from this IDEA? All users who use the serial data type and check if they reach its upper limit to prevent production stopping when this happens.
How should it work?

Only the current serial data type should be used in the tables syspthhdr and syspactptnhdr. The others should be marked as unused with 0 or NULL.

Idea Priority Medium
Priority Justification There is a workaround as described above, but it is quite tricky.
Client Name CURSOR Software AG
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  • Admin
    Beate Porst commented
    11 Sep 08:56pm

    ok, closing this one

  • Avatar40.8f183f721a2c86cd98fddbbe6dc46ec9
    Guest commented
    17 Aug 10:48am

    Sorry, the platform must be Informix -> Informix-Server

    I duplicated this RFE to INFX-I-383


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