An evaluation of whether a system works well enough to be fit for purpose. Normally performance refers to the speed with which a system completes an operation or set of operations over time.

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1answer
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GO After every T-SQL statement

What is the reasoning behind using the GO statement after every SQL statement? I understand that GO signals the end of batch and/or allows the reputation of statements but what advantage does it have ...
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5answers
17k views

SQL Server 2012 slower than 2008

I migrated a large website and database from an older server (Windows 2008 / SQL Server 2008 / 16 GB RAM / 2 x 2.5 GHz Quad Core / SAS disks) to a newer, much better server (Windows 2008 R2 / SQL ...
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2answers
3k views

Is the overhead of frequent query cache invalidation ever worth it?

I'm currently working on a MySQL database where we are seeing a large number of invalidations from the query cache, primarily because of the high number of INSERT, DELETE and UPDATE statements that ...
12
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4answers
9k views

SQL Server statements intermittently slow on SQL Server 2008 R2

On one of our customers, we've been having some performance issues on our application. It's a .NET 3.5 web app that is consuming and updating data on a SQL Server database. Currently our production ...
12
votes
1answer
220 views

What are the performance implications of polymodels versus normal BigTable models in google app engine?

What produces the best performance in regular google app engine use, a polymodel or a normal "BigTable" model? The polymodel, effectively, creates a column in the parent table called "class" which ...
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10answers
888 views

What are the top 3 performance Issues that you encounter with your SQL Servers?

I am a student from Fontys University in Eindhoven, and I am currently carrying out a series of interviews to help with the development of a SQL Server tool and I would like to get feedback from the ...
11
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3answers
4k views

SQL Server - Temporary vs. Physical Tables

A movement is afoot in my place of employ to move away from using #temp tables and instead to use permanent physical tables with SPIDs. Whenever one would have previously INSERTed INTO a #temp table, ...
11
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3answers
4k views

How do indices impact query performance?

Obviously keeping several different indices has a negative impact on insert and delete performance. How about query performance: Does it make sense at all keeping too many indices on a table? Will the ...
11
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4answers
10k views

Mysql int vs varchar as primary key (InnoDB Storage Engine?

I am build a web application (project management system) and I have been wondering about this when it come to performance. I have an Issues table an inside it there are 12 foreign keys linking to ...
11
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2answers
411 views

To maximize DB performance, which commands should be run after loading large amounts of data into SQL Server 2008 via SSIS

I have written an SSIS package to load test data into an empty database. Some of the tables are very large (~700 million rows). Once the SSIS package has completed are there any commands I should run ...
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8answers
11k views

Tools to monitor Oracle Database Performance on Standard Edition

Here is what I am looking for: Works on Standard Edition i.e. No Diagnostic Pack. Provides both current and historical performance data. Good visuals for easy spotting of trends and presentation ...
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2answers
4k views

Reasons for occasionally slow queries?

We are running MySQL 5.1 on Windows Server 2008 R2. We have been doing some diagnostics on our database of late and have found some disturbing artifacts which we can't explain. We added some code to ...
11
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1answer
328 views

Should NOT IN be avoided?

Among SQL Server developers, it's a widely held belief that NOT IN is terribly slow, and queries should be rewritten so that they return the same result but do not use the "evil" keywords. (Example) ...
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2answers
148 views

A question on SARGability

I just need to confirm that I understand something correctly: I recently viewed an SO question in which a user posted an answer in Linq like: from p in db.table where p.column.AddMinutes(1) > ...
11
votes
3answers
5k views

How to optimization database for heavy I/O from updates (software and hardware)

The situation I have a postgresql 9.2 database which is quite heavily updated all the time. The system is hence I/O bound, and I'm currently considering making another upgrade, I just need some ...
11
votes
4answers
6k views

What's better for large changes to a table: DELETE and INSERT every time or UPDATE existing?

I am making a project where I need to change around 36K records in one table daily. I'm wondering what will perform better: delete rows and insert new ones, or update already existing rows For me ...
11
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1answer
3k views

SQL Server Cache Flush and Disk I/O

We're busy load testing an OLTP system we've developed in .NET 4.0 and runs SQL Server 2008 R2 in the back. The system uses SQL Server Service Broker queues, which are very performant, but we are ...
11
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2answers
3k views

Placing Transaction Log on Separate Volume [solid state]?

Transaction logs are often isolated on a separate volume. The rationale for this practice, as I understand it, is that the transaction log's data is written sequentially -- and hard drives can execute ...
11
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2answers
1k views

SQL Server: Has anyone used the large-page allocations tuning option?

Has anyone used the tuning option of using TF834 large page allocations. I was just reading an MS article on it and was wondering if anybody had used it and seen performance gains. Are there any ...
10
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4answers
13k views

Methods of speeding up a huge DELETE FROM <table> with no clauses

Using SQL Server 2005. I am performing a huge DELETE FROM with no where clauses. It's basically equivalent to a TRUNCATE TABLE statement - except I'm not allowed to use TRUNCATE. The problem is ...
10
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4answers
12k views

Aggressive Autovacuum on PostgreSQL

I'm trying to get PostgreSQL to aggressively auto vacuum my database. I've currently configured auto vacuum as follows: autovacuum_vacuum_cost_delay = 0 #Turn off cost based vacuum ...
10
votes
3answers
2k views

How is LIKE implemented?

Can anyone explain how the LIKE operator is implemented in current database systems (e.g. MySQL or Postgres)? or point me to some references that explain it? The naive approach would be to inspect ...
10
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3answers
6k views

general memory requirements for sql server 2008 r2

I'm not experienced with DBA work, but I'm trying to make a case for requesting additional resources for our sql server and was hoping I could get some smart folks to provide a rough rough estimate of ...
10
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2answers
549 views

Postgres query plan of a UDF invocation written in pgpsql

It's possible when using the pgadmin or plsql to get a hold of a query plan for a sql statement executed via a UDF (using EXPLAIN). So, how do I get a hold of the query plan for a particular ...
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4answers
4k views

Help me choose a RAID level combination for a SQL Server 2008 instance

I am going to rebuild one IBM 3400 server from scratch. This server is dedicated to a SQL Server 2008 instance running on Windows 2008 R2. I am going to make new RAID configuration. I have 6 SCSI ...
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3answers
5k views

SQL Server performance sudden degradation

I have a SQL Server 2005 that has become unpredictable of late, and I'm scratching my head as to why. Queries that executed in seconds are changing plans and taking minutes (taking the time in full ...
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2answers
5k views

How to create an index to speed up an aggregate LIKE query on an expression?

I may be asking the wrong question in the title. Here are the facts: My customer service folk have been complaining about slow response times when doing customer lookups on the administration ...
10
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2answers
415 views

@table_variable or #temp_table

I have a big user defined table type variable that has 129 columns. I will store around 2000-3000 records in this table variable at a time and pass it to various stored procedures and functions to get ...
10
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2answers
2k views

Is there a way to force an index to stay in memory with SQL Server 2008?

I've got a table with several millions rows, from which I need to run some queries from time to time. First query will usually be quite slow (around 10s), and subsequent queries are usually way faster ...
10
votes
1answer
7k views

Order by column should have index or not?

I have added indexes to table which are used for searching result. I am showing results by ASC or DESC order. So that column should have index or not? I have 2 more indexes on that table. How ...
10
votes
1answer
2k views

Optimising BCP performance for BLOB data

I'm the process of planning the live migration of a 2TB database to partitioned tables. The system is broadly speaking a document store, the majority of the space being allocated to LOBs of between ...
10
votes
2answers
724 views

Why are simple SELECTs on InnoDB 100x slower than on MyISAM?

I have quite an annoying problem. I want to use INNODB as my main database engine and give up on MyISAM as I need the former for using galera-cluster for redundancy. I copied (description follows) ...
10
votes
1answer
5k views

Index optimization with dates

I have a large table of objects (15M+ row) in PostgreSQL 9.0.8, for which I want to query for outdated field. I want to divide the query by millions, for scalability & concurrency purposes, and I ...
10
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2answers
780 views

Strategy to handle an SQL Server DB with too many files (BLOBs) in it?

Scenario: SQL Server 2005 database servicing an ASP.NET application (on a separate web servers). Database: DB has about 5GB of "normal" data in it, and about 15GB of "files" (e.g.: a 200k PDF stored ...
10
votes
3answers
1k views

Where is the INNODB Performance Leak?

I have a weird problem which I cannot seem to fix. I'm more an web programmer than a Server/DB Admin, so I hope someone here can help me. The Situation I am working on a system which handles a lot ...
10
votes
2answers
5k views

INSERT performance difference between temporary tables and table variable

I have the following issue in SQL Server 2005: trying to inserts some rows into a table variable takes a lot of time compared to the same insert using a temporary table. This is the code to insert ...
9
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3answers
7k views

How do you clear out all old query plans from within Microsoft SQL Server?

We have an off the shelf application that uses a Microsoft SQL database. Within this application we pick and choose various selection criteria for each report. This application then runs these ...
9
votes
2answers
6k views

Which performance counters can you look at on a SQL Server Instance to determine it's performance and over all health?

I am a student from Fontys University in Eindhoven, and I am currently carrying out a series of interviews to help with the development of a SQL Server tool and I would like to get feedback from the ...
9
votes
3answers
2k views

Testing stored procedure scalability

I have an email application that will be called upon to deliver to the UI the number of new messages for a given user on each page load. I have a few variations of things I am testing on the DB level ...
9
votes
2answers
573 views

How many Sproc Parameters is too many?

I've just started writing a Stored Procedure in SQL Server 2008 and have 30+ parameters. I've never written one with more than ~10 parameters, and that got me thinking... At what point are there too ...
9
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2answers
4k views

SQL Server 2008 - Cross database performance on same physical machine and server instance

Is there any performance hit when doing a select across another DB on the same physical machine? So I have 2 databases on the same physical machine running within the same SQL 2008 instance. For ...
9
votes
2answers
7k views

Optimizing bulk update performance in PostgreSQL

Using PG 9.1 on Ubuntu 12.04. It currently takes up to 24h for us to run a large set of UPDATE statements on a database, which are of the form: UPDATE table SET field1 = constant1, field2 = ...
9
votes
1answer
3k views

SQL Server TempDB behaviour in large memory environment

Reading over In-memory SQL Server log file reminded me of a question I had a short while ago. We have a SQL Server that has 512GB of RAM, the main database is (only) 450GB. We see quite a lot of ...
9
votes
2answers
5k views

Percona vs MySQL

What is Percona? How does it differ from MySQL? When should we consider switching (or upgrading) from stock MySQL to Percona? To add some specifics in our situation we almost exclusively use ...
9
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3answers
312 views

Query Performance Tuning

When you finish writing a query/stored proc/function, what's the most informative way to quickly get some performance parameters? Do you run the query and view the actual execution plan? If so, what ...
9
votes
1answer
1k views

How important are transaction log VLFs for performance?

How important are VLFs when considering database performance? What would describe an optimal situation for VLFs?
9
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3answers
4k views

Database suggestion for a social network/ knowledge base community?

I am looking into various database types and DBMS's for a new project I am wanting to start in the summer. I have built systems in MySQL and postgreSQL , now I am wanting to expand my knowledge and ...
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3answers
13k views

How to get the most out of MySQL on a QuadCore machine with 16 GB of RAM?

I'm running a MySQL 5.5 server on my workstation for scientific data analysis and wonder how to configure MySQL in order to get the most out of it performance-wise. The types of query that I typically ...
9
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2answers
3k views

Updating 700 million rows to same value

I've got a data warehouse (oracle) where I need to set a column to the same value for all 700 million rows. I don't have admin access, or access to an admin, so this needs to be accomplished with ...
9
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2answers
9k views

Slow Performance Inserting Few Rows Into Huge Table

We have a process that takes data from stores and updates a company-wide inventory table. This table has rows for every store by date and by item. At customers with many stores, this table can get ...