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Add metrics for reverse index scans and number of retries.
As per APAR IT37120: CONCURRENT QUERIES USING REVERSE SCAN OF INDEX WITH MANY DELETEDENTRIES MAY ENCOUNTER POOR PERFORMANCE
reverse index scans can require a retry.
Add metrics for number of reverse scans per partition and number of retries.
Enhance availability of readahead performance details
With the ubiquity of intelligent storage, the value of readahead in the Informix server is reduced and excessive readahead can be detrimental to performance. However, since the introduction of the AUTO_READAHEAD parameter and the associated change...
When we create a view using a sensible-looking query, the database converts it into a version that has lots of extra parentheses and odd-looking table names. Below is an example of one of these converted queries. This is a relatively simple exampl...
Implement CREATE OR REPLACE option for triggers/views/synonyms/row types
Since a similar option for stored procedures is available starting with version 14.10 it would be handy if this syntax could also be introduced for triggers, views, synonyms and row types.Currently you first have to drop a trigger/view/synonym or ...
Informix documentation for oncheck command should be crystal clear
Informix documentation for oncheck command does not explain clearly that this command should be run only during a maintenance window or during an off-hours period because the oncheck utility places a shared lock on system catalog tables when the ...
Every query which need to group by and concat few columns is impossible with informix. For example for this SQL :select t.tabname, c.constrname
from sysconstraints c, systables t , outer syschecks k
where t.tabname = '...
over 1 year ago
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, seri...
Developers have the Informix Client SDK installed on their workstations / application development machines.
There is the need to be able to dump the Informix databases schemas definitions, but the SDK does not provide any such tool.
To work arou...
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