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0
votes
2answers
124 views

Database is slow once in a while

I am executing a web service for 100 times. The average response time of this service is 1.5 seconds. But when I look at the response time of each execution individually, there are a few executions ...
2
votes
1answer
92 views

High I/O for part of query

I have a large query that I'm trying to tune. I write lots of queries but haven't done a lot of tuning. I've included a screenshot from SQL Sentry Plan Explorer Free (SSPEF): In the above part of ...
2
votes
1answer
108 views

poor and/or unreliable InnoDB performance

I recognize that there are a ton of posts like this, but after reading up on InnoDB performance problems, nothing I tried has helped. I have a database containing four InnoDB tables. The largest ...
0
votes
1answer
44 views

Tuning Mysql and Monitoring

I would like to know if anybody can point me towards a tool/way for MySQL database tuning ... Actualy the tunning of my.cnf is like below My database is in MyISAM | Mysql 5.1.73 key_buffer = 500M ...
0
votes
1answer
37 views

MySQL: How turning off the logging affect the performance?

OS: RHEL5 DB: MySQL 5.1.73 community edition DB size: ~1GB I have setup a testing environment and turned off all logging - general logs, binary logs, slow query logs etc. I am using Oracle ...
0
votes
1answer
101 views

How to optimize query

using SQLite3 and the following query, it seems like there should be a better performing way to write this query? Is there? Select Name, Sum(Case When Used Is ...
0
votes
1answer
931 views

How to change page size in an existing sybase database

I have an existing database with 1 kb page size i want to increase that to 16kb and increase cache to take advantage of my memory for best performance. sybase documentations said you can't change page ...
-1
votes
1answer
42 views

Very Slow MySql Stored Procedure

I'm working with a web app running on MySQL. It uses stored procedures for all database-related tasks. The original web app and the database were designed by another developer; I'm only maintaining it ...
2
votes
0answers
135 views

High Cardinality, Time Series Data.. what DB should I use?

I have a system that I'm building based on ElasticSearch. It works great, except I'm having trouble with one of my facets. I've got about 10 million documents, and each document has 1 to 200 ...
1
vote
0answers
40 views

DB Design: Looking for Performance improvement with a Column used in all SQL Queries

I recently got added to a new ASP .NET Project(A web application) .There were recent performance issues with the application, and I am in a team with their current task to Optimize some slow running ...
1
vote
0answers
9 views

Tuning MySQL On Azure Windows Server Setup

I have a MySQL 5.5 running on Azure VM Windows Server 2012. Once per second the log db gets about 2K inserts through LOAD DATA INFILE... once a day I need to run stats and when the stats are crunching ...
1
vote
0answers
46 views

MongoDB read performance

I have an ingestion process which loads data into a specific collection at a very high rate. Some of these documents have to be loaded into another system in batches of 100K . Means as soon as I find ...
1
vote
0answers
125 views

Optimization Tips For MYSQL Tuner/Primer

So I have a site that has a crap ton of traffic. I see a decent amount of latency when the site has over 1,000 active visitors on it. I have new relic installed and it seems Im only using 10% of the ...
1
vote
0answers
118 views

What to do with unused RAM on a MySQL database server?

For years I have been running dedicated servers with more or less limited ressources, resulting in unsatisfying performance of the web application (Drupal). Tools like Matthew Montgomery's MySQL ...
1
vote
0answers
68 views

MySQL query with order by decreased performance

Here is my schema: CREATE TABLE `UserMst` ( `UserID` mediumint(8) unsigned NOT NULL AUTO_INCREMENT, `EMailID` varchar(50) DEFAULT NULL, `UserName` varchar(20) DEFAULT NULL, `FullName` ...
1
vote
0answers
51 views

Help with Mysql with 100K+ Table

Hi im trying to develop a database design in which its gonna have 100K+ tables residing in it. My major concern here is will Mysql be able to hold that much amount of tables with no performance ...
1
vote
0answers
63 views

Performance of database with transactional data

There are lots of row modifications (several thousands of rows per minute) in our PostgreSQL database that stores transactional data. We have a problem because PostgreSQL runs vacuuming process and ...
1
vote
0answers
521 views

SQL Server Database Engine Tuning Advisor vs DMV queries

What is the best way to tune the indexes on my production database? I normally use the following query : SELECT user_seeks * avg_total_user_cost * (avg_user_impact * 0.01) AS [index_advantage], ...
0
votes
0answers
12 views

Multiple Trace Files or Replay

I am just wondering how useful the replay functionality of SQL profiler is. The issue I have is that I can capture a workload from production with little overhead, however I would not be able to ...
0
votes
0answers
47 views

same query different servers,different execution plan and time

I have this query and it runs less than 2 minutes on Test but on Prod it takes 10 minutes. Both are the same version,CPU,RAM,OS the same. I have four tempdb files on Prod but one one Test. I ...
0
votes
0answers
56 views

Big Mysql table optimization

I have a table that I use to cache google translate API answers. Table structure is orig_string and group are indexes Now it has more that 1million rows with 35000 distinct values in group field. ...
0
votes
0answers
18 views

Performance One Row With Total Vs Multiple Rows with Seperate Values?

Not 100% sure how to explain this situation but here it goes: I am building an Inventory Database that all items received are entered into and a label is created for each Container, that is going to ...
0
votes
0answers
102 views

Remote scan in OpenXMl

I'm looking for some advice on OPENXML. Specifically, the performance. I am seeing very slow performance on a very small piece of XML. Something about this is causing a Remote Scan. Any ideas on how ...
0
votes
0answers
34 views

performance improvement - left join

How do I rewrite to improve performance of the below query. select S.col1, S.col2, MaxDDate from s_tbl s left join (select col1, MAX(DDate) MaxDDate from F_tbl group by col1 ...
0
votes
0answers
16 views

MySQL: How logging is useful in performance improvement

My application is facing performance hit. Its a MySQL-5.1.55 version. I am using Windows 2008 dedicated server with 8 GB for the database. There is only one database in this whole system. Till now, I ...
0
votes
0answers
183 views

MySQL: How to get locked tables list at a time

Is there any way or any query exist in mysql which list down all the locked tables at a time. I have dedicated Windows 2008 DB server with 8GB memory. In my MySQL5.1 based application, suddenly we get ...
0
votes
0answers
160 views

MySQl: slow query is not using index in joining

Below is the configuration of my DB server: Apache version : Apache/2.2.22 (Win32) mod_ssl/2.2.22 OpenSSL/0.9.8 PHP version : 5.3.13 MySQL version : mysqlnd 5.1.11 Windows Server 2008 Standard ...
0
votes
0answers
65 views

Percona cluster performance issue

We have 3 servers running in a percona mysql cluster. Two of the servers in the cluster are running on older hardware specs. The third is a real monster with a lot of RAM and SSD hard drives and so ...
0
votes
0answers
117 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 ...