Tagged Questions

3
votes
1answer
70 views

Insert performance with Geography column

I've been tasked with inserting data into a SQL Server table with a geography column. I've found that my times for doing inserts (same data 1.5 million rows) go up increasingly. I started out with no ...
3
votes
2answers
67 views

If I update a column record in a table, will indexes that do NOT have this column in it be affected?

In terms of performance if I have a table like so: CREATE TABLE [TESTDATA].[TableA]( [Col1] [nchar](5) NOT NULL, [Col2] [nchar](2) NULL, [Col3] [float] NULL CONSTRAINT [TableA_PK] PRIMARY ...
2
votes
1answer
46 views

SQL Server full safety mirror commit overhead less then Time to send?

How is it possible that the time to send value is greater then the mirror commit overhead? The mirror operates under full safety so this means that the commit is only done @ principal when the commit ...
0
votes
0answers
39 views

What's the best database for analysis/research applications, i.e. involving complex queries but few transactions? [closed]

I'd like to start a discussion on what people think what the best database environment (MySQL, MS SQL, PostgreSQL, ...) is for data analysis and research applications like encountered in empirical ...
-1
votes
4answers
83 views

Dropping and recreating indexes [closed]

I most often come in a situation where the users move there database from one server to another and immediately after they move they face performance problems(slowness). I somehow manage to rebuild ...
0
votes
0answers
55 views

How to improve the performance for SQL Server Count(distinct()) and Sum() functions? [closed]

The below one is my query. It's taking 12 seconds for the execution process. The count(distinct()) and SUM() functions are taking long time for execution. I tried it after create the non-cluster index ...
2
votes
2answers
115 views

Is there a difference in performance between @date and getdate()?

Usually I use the getdate() function in my where clauses to go back in time. Something like: DOC.DATUM >= DATEADD(DD,-1*SSN_SDO.DANA_ZA_POVRAT,GETDATE()) Will SQL Server 2008R2 perform faster ...
2
votes
2answers
81 views

Linked Server Risks

I'm implementing a new feature which requires data from databases on multiple servers. I just need to union data from all these servers and sort it. The two options that come to mind are: Use linked ...
1
vote
0answers
115 views

sql server 2008 execution plan different on two production servers [closed]

We have two servers running SQL server 2008 R2, with identical databases, where we implemented a datawarehousing solution. The cube processing operation was taking a VERY long time in one of the ...
2
votes
3answers
135 views

SQL server disk write queue dramatically grows sometimes

I have SQL Server 2008 and a single database with full recovery model. Usually, the queue length is less than 1. But sometimes it grows up to several thousands (3000!!) for a few seconds. At this time ...
1
vote
4answers
101 views

SQL Server 2008 DB Performance on single disk

I have a database in SQL Server 2008 with around 20 GB in size. And it is increasing rapidly. Somehow I can not add multiple independent harddisks to increase IO performance. If a add large table ...
6
votes
1answer
195 views

Landed as BI, but databases are a big WTF, what to do?

Maybe a duplicate, but I believe my case is a bit different. From one of the answers I got to this post on SQL Server Central that also comes handy too but is not quite the same scenario: 9 Things to ...
2
votes
6answers
469 views

SQL Server split mdf into multiple files

I have a database called example.mdf with a total size of 1GB which suffers from performance issues. I checked the allocated hardware and it is higher than required, I double checked the design and ...
5
votes
1answer
71 views

RESOURCE_SEMAPHORE_QUERY_COMPILER waits in Microsoft SQL Server 2008 Enterprise

Could fragmented indexes on Microsoft SQL Server 2008 Enterprise cause RESOURCE_SEMAPHORE_QUERY_COMPILER waits? The last two weeks one of our applications has had downtime due to ...
1
vote
3answers
186 views

When to periodically RESTART SQL SERVER 2008 R2? [closed]

So I've read that it's really a bad practice to restart SQL Server on a production environment.. Does restarting SQL Server speed it up? Automatically restart SQL Server 2008 Why are periodic ...
3
votes
3answers
255 views

Investigating high SQL waits, especically LCK_M_U

Recently I have been struggling with SQL server performance and although we have fixed a huge multitude of basic errors in the config it is still performing badly. To clarify it is not overall ...
5
votes
1answer
936 views

High Buffer I/O SQL Server 2008 R2 causes?

Am trying to troubleshoot performance on an SQL server that we have for our document management server and today performance has hit an all time low. Looking at the MDW I setup recently I can see a ...
0
votes
1answer
70 views

SQL Server weird issue with indexes and query planner

We had a bunch of crashes and restorations a few days ago and following those, the SQL Server DB has been acting strangely. We know that there were some issues with the failover clusters due to which ...
4
votes
1answer
140 views

Stored procedure performance metrics

I am taking over a new project which is having ~2500 SPs! and would like to know at current state what is the maximum / minimum time taken by each of the stored procs. Also IO, Logical Reads used by ...
2
votes
1answer
140 views

SSD for production database

I am looking for a solution to [dramatically] improve an enterprise database performance on a system that needs to support thousands of transactions (inserts & large selects) per second. Besides ...
1
vote
1answer
88 views

sp_setapprole taking 100 - 200 ms [closed]

SQL Server 2008 SP1 here. We have a machine where sp_setapprole calls take more than 100ms and they are done many times per user operation on an application. The developer says that in his setup, ...
0
votes
1answer
187 views

MongoDB Master and Slave Replication - Windows or Linux

I have recently moved my MS SQL Server Database to MongoDB (2.0) on Windows Server 2008. Its containing 2 databases with following stats. (both databases get around 100 reads/writes per second). These ...
3
votes
2answers
118 views

Inner Join or direct data save in SQL Server

I am developing a social network site and expecting very good response from people so expecting huge users (maybe more than million in years). My website is holding user information table and all its ...
5
votes
3answers
276 views

Reducing the size of a database

SQL Server newbie here. I'm a MySQL guy. I'm having a look at something for a client in their 2008 SQL Server, and need some advice. Whoever designed the database chose to log insane amounts of stuff ...
5
votes
2answers
204 views

Index fragmentation and SSD disks

I'm new to performance problems, but I saw some discussion that SSD disks solve performance problems caused by index fragmentation. Has anyone experienced this? I'm thinking of changing my hardware ...
4
votes
1answer
313 views

need suggestions to improve view performance

I am looking to improve the performance of a view in SQL Server 2008. This view exists in a reporting database that is widely used by not-very-technical-folk to basically denormalize all of these ...
2
votes
0answers
719 views

Table Lock on INSERT - How to optimize

we have a few long running procedures in the database, that cause an instant Table Lock on our main text storage table, which causes all other requests of the web app to wait (because the table is ...
2
votes
2answers
531 views

Fast XML, slow XML

Our database update Windows application needs to transfer some data between two databases as part of the process for a certain one-time update. I chose XML as the intermediary to move the data. The ...
-2
votes
1answer
122 views

How to run 2 separate sql server engines on the same server?

I have a Windows server, and on this server there are many websites running and most of them connect to the installed SQL Server, some of them connect to SQL Server Express and some to local. My ...
2
votes
1answer
38 views

In real terms, how much effect does a bad fillfactor have on performance?

There's a storm brewing, or maybe I should say firestorm. A customer has recently implemented SQL Server 2012 Always On but that's not the most important bit. A list of fires to be put out has been ...
2
votes
2answers
253 views

Closed loops in database model, does it affect the performance?

I have heard that having loops in the database relational model should be avoided. From what I can think of, it is not a good practice, because there will be more than one different pathes to get the ...
-1
votes
1answer
132 views

Multiple schema or multiple databases for better performance [closed]

I need to improve the performance of our enterprise .Net search application from the database point of view. The app already has 4 schemas on SQL Server 2008. 2 schemas for front-end operations ...
12
votes
4answers
522 views

The order of columns in a table

From what I've seen so far, when we define a table, normally we put the primary key as the first column. If there are miscellaneous columns that are common in all tables, they come at the bottom of ...
3
votes
1answer
114 views

In-memory SQL Server log file

I have a SQL Server instance that is used solely for the purpose of reporting and also for preparing data to be loaded into Analysis Services. Its data comes from another SQL Server instance which is ...
5
votes
2answers
382 views

SQL Server performing slow

I have a Microsoft SQL Server running on an IBM server with 10 cores and 64 GB RAM. I have from 100 to 300 users working concurrently on the server. Users complain about slowness of the application. ...
1
vote
3answers
393 views

Improve performance of a Fact Table

I have a Fact table CardTransactionFact Table Structure TABLE [dbo].[CardTransactionFact] [CardTransactionID] [int] IDENTITY(1,1) NOT NULL, [TransactionTerminalID] [int] NOT NULL, ...
3
votes
2answers
692 views

Rebuilding index has impact on mdf/ldf files SQL Server 2008

While rebuilding index have used option 'SORT_IN_TEMPDB = ON' in order to avoid unnecessary growing your user database files. What does it exactly means? Is complete process done on TempDB and does ...
2
votes
1answer
114 views

Optimising a query using hint locks

I have a stored procedure that is being called very frequently. For some database servers it is as often as 20 times per second. Unfortunately because different clients call this procedure, I can't ...
6
votes
2answers
312 views

What are the pros/cons of splitting date and time into separate fields vs. using the datetime data type and storing the date in a single field?

My database is extremely large and growing at a rate of ~20m rows/day. I have timestamp data that is important but most of the reporting is based on date ranges and week over week or month over month ...
5
votes
1answer
393 views

NESTING_TRANSACTION_FULL latch

Production SQL Server 2008 performance is far below expectations. Simple single-table queries sometimes are working for 5 seconds in the mid-day compared to 250ms after hours. We cannot find which ...
6
votes
3answers
917 views

SQL Server 2008 R2 High CPU

We are having a SQL Server R2 Web Edition database, based on Windows Server 2008 R2 with a strong CPU and 32GB RAM DDR3. Our database works very hard (we run around 600,000 queries in 1 minute) and ...
5
votes
1answer
122 views

How do I find out who is the resource hog in SQL Server 2008?

We have a SQL Server 2008 installation on a machine with 24+GB of RAM and 16 cores. Plus fast drives, etc. A large machine by our standards. Anyway, that machine is 100% devoted to SQL Server and ...
4
votes
2answers
316 views

varchar performance impact

This question has been asked before ( speed impact of using varchar in MSSQL 2008 ), but the answers are not detailed enough to my satisfaction. Admitedly this is not a current issue and mainly for ...
3
votes
5answers
782 views

Does SQL profiler affect server performance?

I am facing a problem where the sql server 2008 fails for some high load. I need to find that load case and need to optimize the code so that it can handle the load. I have found on the internet that ...
4
votes
1answer
371 views

In a CASE Statement, which is faster: “WHEN [field] in (0)” or “WHEN [field] = 0”?

I'm looking at a stored proc that another guy has written and every WHEN clause is using an IN statement instead of =. My gut tells me this isn't as fast, efficient, etc. For example: CASE WHEN ...
6
votes
4answers
2k views

Select statement takes long remotely due to long “client processing time”, but short locally

While connected to our production server (SQL2008. very powerful machine), this select statement takes 2 seconds, spitting back all fields (4 MB of data in total). select top 30000 * from person ...
3
votes
3answers
3k views

Slow insert in SQL Server 2008

Our products' database contains an audit trail table: CREATE TABLE gn_AuditTable( gn_ObjectId int NULL, gn_Action smallint NULL, gn_Time datetime NULL, gn_UserId int NULL, gn_Login ...
1
vote
2answers
282 views

Does it ever make sense to use RAM Disk to force RAM allocation for tempdb with SQL Server 2008

If I give all RAM to SQL Server, it will use it's own pattern to determine what RAM to allocate for what. If I allocate portion of RAM as RAM Disk and put tempdb into that disk it will force RAM ...
5
votes
2answers
108 views

Are existing entries immediately included into a newly created index?

Suppose I have a table Stuff with a column City and no indices including that column. I populate the table. Then I decide to create an index: CREATE INDEX [StuffOnCityIndex] ON [dbo].[Stuff](City ...
2
votes
1answer
518 views

Performance Inserting and Updating Millions of rows into a table

We have a CSV the user imports into the Application. After inspecting the CSV, validating and applying some business logic, we got Inserts and Updates operations we should perform into a ...

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