HP service Tags - what type of bar codes do they use?

Question

Hi there,
i have asset tracking software and a bar code scanner. I'm looking to know what type of bar code is on the HP service tags. As i want to be able to scan in the bar code to give me the serial number of the machine.
thanks,
Paul

Answer 1

Hi,
your problem is that you are trying to resolve a problem related to a specific statement by using instance-wide tools. You should look at performance stats for that particular statement.
1) Identify sql_id of the offending statement (e.g. select sql_id from v$sql where sql_fulltext like '%part_of_statement_text_here%', if it doesn't return results check case or look in
dba_hist_sqlstat)
2) Look for records with this sql_id in DBA_HIST_ACTIVE_SESS_HISTORY (use filter on sample_time). Compare performance indicators for the timeframe of the incident and outside it
3) You can also find performance stats for this statement in DBA_HIST_SQLSTAT, but you will have aggregates over snapshot duration
Given your symptoms, the most logical explanation is a plan flip. Check plan_hash_value in DBA_HIST_SQLSTAT -- if it changed around the time of the incident, that will confirm your suspicion.
Use dbms_stats.display_awr to display both "good" and "bad" plan. Try to understand the key difference, look at predicates for any hint that could explain it. If it doesn't give you results,
use format=>'advanced' to generate outlines for both plans, then you can set STATISTICS_LEVEL=ALL and run the statement with both plan, producing extended plan statistics. Use
dbms_xplan.display_cursor(..,..,format=>'allstats last') to display it. If having difficulty interpreting it, post it here to get the help from community.
Best regards,
Nikolay