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IDS Forum

ER Shadow Columns, maxint issue?

Posted By: JEFFREY GENEGA
Date: Tuesday, 9 October 2012, at 8:47 a.m.

Hi All,

I have an Enterprise Replication environment using flexible grid so that when tables are created on the primary machine, they are also created on the backup.
This means that the shadow columns are automatically generated for the tables, as follows:

Column name Type Nulls
ifx_erkey_1 integer yes
ifx_erkey_2 integer yes
ifx_erkey_3 smallint yes

This is fine, but I have a lot of data being added to the database each day (about 26 million rows). The shadow column values for one of the rows is as follows:

ifx_erkey_1 ifx_erkey_2 ifx_erkey_3

85 26519045 50

I am wondering where these values come from. My sqlhosts file look like this:

myapp_server group - - i=50
myapptcp onsoctcp saturn 9005 g=myapp_server
myappalias onipcshm saturn myapp_saturn

myappbk_server group - - i=22
myapptcpbk onsoctcp spcgmttac01 9005 g=myappbk_server
myappaliasbk onipcshm spcgmttac01 myapp_spcgmttac01

I am guessing that ifx_erkey_3 is the group number of the primary server. I have no idea where the 85 value for ifx_erkey_1 comes from. And, from what I can tell, ifx_erkey_2 is unique across all of the replicated tables (about a hundred of them), and it looks like it is incremented by one each time a new row is added. I also noticed that ifx_erkey_1 and ifx_erkey_3 are the same for all rows in all of the replicated tables.

So, if the ifx_erkey_2 field is being incremented every time a new row is added, what will happen in about 80 days when this field reaches the maximum integer size? Will ifx_erkey_1 and/or ifx_erkey_3 change in order to allow ifx_erkey_2 to start again from 0?

This is IBM Informix Dynamic Server Version 11.70.FC5GE.

Thanks,
Jeff Genega

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