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2answers
100 views

mysql need help optimizing query

I have a table containing servers logs, and another table containing rules to match certain and drop them. The logs tables contains around 1 million rows, and there are about 20-30 rules. The ...
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1answer
30 views

Oracle Compatible Parameter to set

Is there any difference in setting the Compatible Parameter to 11.2.0.0 vs 11.2.0.4 ? Are there any advantages / dis-advantages ?
1
vote
1answer
75 views

tuning feed item's table query with multiple condition

I have a query like this: SELECT * FROM `rss_item` WHERE `feed_id` = 1 and `timestamp` < 1350698635 ORDER BY `rss_item`.`timestamp` ASC MySQL: 5.1; table engine: innodb Explain result: ...
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0answers
35 views

DB2 LUW Query Optimization - IXSCAN timerons greater than total timerons

Sorry - I feel like this is a newb question, but I can't find anything on it. In optimizing a query, I was able to apparently reduce the total timerons from 3,700 to 38. However, on closer examination ...
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0answers
13 views

MySQL: index statistics dropped when table dropped?

When a table is dropped, are its index statistics also removed? The reason I ask is that I was hoping to 'prep' the stats by running log playback via the percona-playback tool prior to cutting over ...
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0answers
39 views

Low Query cache efficiency after mariadb 5.5 migration

First of all, many thanks in advance for your creating this nice site/place where people can find help to our "big" issues/problems. I usually use every day and you dont know how many times I fix my ...
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0answers
105 views

InnoDB tuning with 1G of ram limit

I am trying to calculate variable moving averages crossover with variable dates. That is: I want to prompt the user for 3 values and 1 option. The input is through a web front end so I can build/edit ...
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0answers
56 views

mysql: how many disk seeks were made for a select query

I will fire a select query. I want to know how many disk seeks does that query take. mysql documentation has given formula for full table scan. ...
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0answers
130 views

PostgreSQL can't start after tuning some options

I'm having some issues with "too many clients" and I tried to change the max_connections param (currently 100). I tried to set some value like 300, but when I restart the service, I got this ...
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0answers
493 views

Oracle 10g - Sudden change in execution time for specific query

After the DBAs fiddled with some parameters in our Oracle 10g Production Environment, most queries became a little faster. But a single query (a quite complex one) became dramaticaly slower - it went ...