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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.
We are trying to increase the usage of SP in our system environment. Migrating business code from 4GL to the database.But this process becomes very painful for our developers since the support for SPL is limited. Mainly the inexistence of a native...
Modernize dbexport/dbimport and control them from HQ
dbexport and dbimport are useful tools, very easy to use and straight forward. but as the database are growing exponentially, the tool is showing its limitations and a workaroud must be generally be applied, which are kind of time consuming to wr...
Many times a DBA is called to check upon a slow process. Most of the times those processes are running a slow query.Sometimes it's hard to know if the query is using the best query plan or not. A DBA can reproduce the query, but it it was prepared...
Informix has a rows/page limit of 255 rows/page.Perhaps this was not a problem originally but over time we have seen new features:larger page sizes (up to 16 kB against 2 kB or 4 kB previously, dependent on operating system).compression option.Thi...
Allow Informix to accept Non PAM aware clients to connect when using PAM PASSWORD mode
Standard Informix Authentication on unix will perform a getpwnam() call to retrieve the encrypted shadow password from the OS, it will then compare an encrypted version of the password supplied by the client against this, and if they match, authe...
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...
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...
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 ...
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