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4answers
247 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 ...
2
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3answers
763 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 ?
0
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2answers
226 views

Please recommend changes for my.cnf

I am not having any performance problems per se but want to improve my sites' performance if possible. Would appreciate any advice for how I can improve my.cnf. I have just one server, not ...
1
vote
1answer
109 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: ...
3
votes
0answers
87 views

Sort operation SQL Server 2012

I am trying to optimize a query and the sort operation (91% cost) is the costliest operation. Any help will be appreciated. Query is : SELECT TOP 1 ArchiveType, CONVERT(NVARCHAR(30), A....
1
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0answers
15 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 ...
1
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0answers
1k 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 ...
0
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0answers
21 views

Example Database for tunning

I've been searching for so long and I've still have not found what I'm looking for ,is there any database or similar resource that people uses for tuning a database, or optimize queries?. I would be ...
0
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0answers
66 views

Postgresql configuration for tiny server and append-only data

Currently my database is runing on tiny-sized hardware (digital ocean 5$) and I want to keep this hardware. It is: 512M memory 1 CPU My database works with these conditions: Data is never ...
0
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0answers
166 views

Tuning MySQL with InnoDB engine for my application

I've read through a lot of answers, and I realize this is mostly application specific, so I wanted to give some background as to what I'm doing with the database and hopefully get some tips on tuning ...
0
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0answers
300 views

No query cache efficiency mairaDB

I'm totally new to database tuning, and even though I've done well so far, I'm stuck with my database cache query efficiency 0%. Any help with this would much appreciated I've tried increasing ...
0
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0answers
92 views

Optimization of an old query multiple unioned subqueries

I am currently in the process of optimizing a large query that was written for oracle 8i. My company currently uses oracle 10g which gives us a lot of options for optimization. Please Reference the ...
0
votes
0answers
606 views

Low Query cache efficiency after mariadb 5.5 migration

We change from Percona MySQL server 5.5 to MariaDB but performance is not as good as we think. This graph is from a day in MariaDB. You can see the low performance in terms of cache_hits: We have ...
0
votes
0answers
139 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 ...
0
votes
0answers
110 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. http://dev.mysql.com/doc/refman/5.1/en/estimating-...
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votes
0answers
505 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 ...