V$DIAG_ALERT_EXT and equality conditions


I don’t know if this is a bug but something small took my attention. Codes below are run on 19.8 and 19.12 versions. Lately, I was working on alert log messages and to do that I use V$DIAG_ALERT_EXT view which is a row by row representation of alert log file. while I was looking for values in MESSAGE_GROUP first I got distinct values :

seems fine until now, then I wanted to list everything for message group value is “startup”

at first I though I type “startup” incorrectly but it was correct. then I though there might be some invisiable charanter at the end but there were none any! So I tried a “like” search:

so rows are there conditions are true but result is missing with an equality search.

then I tested this on others columns like host_id, organization_id etc and same behavior! I decided to create a table using CTAS and test it on it if there is something different on the data:

it worked! so there is nothing wrong with data. equality search is working on dummy table. Also if you check column data types you can see that they are VARCHAR2(67). As a last step I wanted to look at the data using DUMP function:

so data is exactly the same. either this is a small bug on V$DIAG_ALERT_EXT or it is a feature 🙂 I am not sure but just in case consider searching v$diag_Alert_ext with like conditions (using % sign at the end) not an equality.

wish you a healthy days.

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