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5
votes
1answer
2k views

How can dm_db_index_usage_stats show 0 for user_seeks and user scans but a large number for user_lookups?

I'm probably not understanding something but here is the question. I have done a query on dm_db_index_usage_stats. I've noticed that a couple of my indexes have large numbers (6.5 million and 20 ...
0
votes
3answers
422 views

Is it possible to check a date in SQL?

I'm trying to write a Microsoft SQL Server stored procedure which takes an account ID, and returns an authentication ticket and whether the ticket is expired. Something like this: SELECT ...
1
vote
1answer
145 views

Printing \G on shell using mysql client..?

It is really a a headache for me from some hours i am struggling on the problem.I have also asked it on stack-overflow but not got any answer yet so i am asking here.Sorry for Not a good question. I ...
2
votes
1answer
587 views

Mirroring multiple source databases to a single destination in SQL Server 2008

How can we maintain multiple source databases data in a single destination server database in SQL Server 2008? They all are at different networks, if that makes any difference.
12
votes
3answers
10k 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 ...
37
votes
4answers
24k views

Does running pg_dump on live db produce consistent backups?

I have a 3GB database that is constantly modified and I need to make backups without stopping the server (Postgres 8.3). My pg_dump runs for 5 minutes. What if the data is modified during the process?...
-2
votes
3answers
81 views

email a database made by My SQL [closed]

I want to email a MYSQL database I created with all tables and queries to other person to check do I use the Import and Export Wizard or there are other ways?
5
votes
2answers
4k views

How to design a schema to store search keywords

I am doing a database design that stores search keywords of a search form, used to generate the most popular search keyword reports by date, month and year. I have made a simple schema: CREATE TABLE ...
41
votes
8answers
22k views

Plural vs Singular Table Name

How should I name my Tables when creating a new database? Singular: Client or Plural: Clients?
0
votes
0answers
40 views

Fix missing performance counters [duplicate]

Possible Duplicate: How to revive SQL Server 2008R2 performance counters? On one machine, I have an instance of SQL Server 2008R2 Enterprise, Visual Studio 2010 and VS 11 Developer Preview. I ...
0
votes
1answer
169 views

Regular expression problem

SELECT FIRSTNAME,LASTNAME, EMAIL FROM CUSTOMERS WHERE REGEXP_LIKE(EMAIL,'[A-Z0-9._%-]{1,10}@[a-z0-9._%-]{1,5}\.[net|com]','i'); I know this is not practical or make a ton of sense, but its a ...
2
votes
1answer
834 views

How to prevent high memory, CPU and time consumption by MySQL restore?

I have a local test machine with 2 GB RAM and a dual core processor. I imported a dump on that using mysql -uuser -psecret < script.sql script.sql is a 700 MB file which contains a single ...
4
votes
2answers
3k views

How could one monitor MySQL replication?

I am not a DBA, but I am interested in knowing how replication monitoring is done on MySQL severs. In order to know if a slave is in sync with its master, one would typically check ...
2
votes
1answer
213 views

Profiler: Only want to see Provider Errors

I'm replaying a trace in Profiler, and I'd like to only see the Provider Errors. Granted, there are ~30,000 of them but I'm not concerned at the moment about row update conflicts, foreign key or ...
4
votes
2answers
713 views

Remove nulls from TSQL connection string

I have a bunch of queries, against a couple different databases, that I use to generate delimited reports. I'm trying to create some new reports against a MSSQL database and I'm having trouble ...
2
votes
1answer
2k views

export data from oracle 10g

I installed Oracle 11g on my computer. When I export data from Oracle 10g, I get the following error code. I have translated the error in parenthesis. EXP-00008: 遇到 ORACLE 错误 904 (encouter oracle ...
2
votes
1answer
3k views

PostgreSQL dump/restore from 8.4 to 8.1 in a shell script

I have to restore a DB table every day from a postgresql 8.4 to 8.1. For the backup, I use this code (windows server): D:\PostgreSQL\8.4\bin\pg_dump -U postgres -p 5433 -t my_table myDB > D:\...
4
votes
1answer
2k views

Migrating Sql Cluster Installation To New Drive

We are migrating from an old SAN to a new SAN and need to migrate our SQL Server instance to new LUNs. We are able to migrate the data without any problem, but the SQL Server instance itself is ...
1
vote
1answer
488 views

Table Statistics Affect Index Only Query?

We have a query that was getting poor performance. The root of the problem could be reproduced using a simple query accessing only one index to retrieve one column (the indexed column) from eight ...
30
votes
8answers
119k views

Get the rank of a user in a score table

I have a very simple MySQL table where I save highscores. It looks like that: Id Name Score So far so good. The question is: How do I get what's a users rank? For example, I have a users ...
47
votes
3answers
35k views

What is the difference between a connection and a session?

What is the difference between a connection and a session and how they are related?
3
votes
1answer
150 views

Table view created with triggers, someone please explain why?

I'm part of a project that inherited a piece of software that has a unique MS SQL database design that I'm trying to understand why they designed it the way they did. Basically for every table, for ...
4
votes
1answer
2k views

How do I resolve this data source connection issue with Cognos?

We have (fairly recently) installed IBM's Cognos 10 as our business intelligence reporting tool. Most of the databases that we report over are DB2 9.7 LUW Enterprise Edition. We installed the DB2 ...
0
votes
2answers
91 views

SQL Server Stored Procs not parameterized, leading to high compilations?

We're experiencing about 300 SQL Compilations per second, and we use very little dynamic SQL. However, I noticed that in SQL Profiler our calls look like: exec cid.dbo.uspCIDLog '9425','19155852234',...
1
vote
1answer
458 views

Execute Queries Against CMS within SSRS Reports?

Is it possible to execute queries against a Central Management Server (CMS) using SSRS? For example, I know of no way to tell a stored procedure that it is inherently supposed to call the CMS, so it ...
-1
votes
1answer
9k views

Remove an instance of “SQL Server 2008 R2” after reinstalling “SQL Server 2008”

I have installed "SQL Server 2008 R2" with an instance name "SQLEXPRESS". Then I found out it cannot restore from my older "SQL server 2008" backup files . So I uninstalled SQL Server 2008 R2 and ...
7
votes
2answers
3k views

Database for building a realtime analytics system

I want to build a system similar to Google Analytics (only used for internal use, less traffic and less feature), and mainly focus on Real time counting of unique URI visit/PV by different dimensions ...
6
votes
1answer
4k views

Performance difference between SQL Server Linked Server and direct query

A Management Studio query pane connected directly to a remote sql server executes and displays a simple table query of (SELECT * FROM table) in just under 2 seconds. The same Management Studio but ...
6
votes
4answers
4k views

What is the best approach to parsing a large amount of strings?

I have a table with over 400,000,000 records and I am looking for advice on how to parse it quickly. TheNameTable ( NameID int primary key, TheName varchar(500) ) The names are stored like this:...
1
vote
1answer
362 views

MySql cluster data node replication

What I'd like to do is to replicate data nodes within a cluster not only for backup/failover purposes but also for scale-out reasons. Is this possible? If not: why? If yes: how do I do it? Actually, ...
20
votes
3answers
6k views

Does a SQL Server bit column really use a whole byte worth of space?

I was poking around SSMS and noticed the "size" of my INT columns were 4 bytes (expected) but I was a bit shocked to see my BIT columns were a whole byte. Did I misunderstand what I was looking at?
1
vote
1answer
445 views

Design SQL Server 2008 new install … which collation?

A customer has a SQL Server 2005 instance, collation SQL_Latin1_General_CP1_CI_AS, with 8 databases ... for a new application, we have been asked to install a SQL Server 2008 with collation ...
2
votes
1answer
4k views

MariaDB XtraDB Performance Tuning

I believe that innodb has a single read thread. However, with MariaDB you can set multiple read threads. I'm unsure what the recommended value would be. Questions Does anyone have any experience ...
8
votes
1answer
4k views

How to index dynamic attributes in MongoDB

I have following kind of data (simplified a bit from my real case) in MongoDB: { "name":"some name", "attrs":[ {"n":"subject","v":"Some subject"}, {"n":"description","v":"Some ...
2
votes
1answer
303 views

Query tuning - SQL Server

One of our developers are trying to run the below query on a development server, which involves pulling data from a linked server, production. The query ran for more than 14 hours before it was ...
2
votes
1answer
245 views

don't want to be able creating stored procedures with incorrect

Right now I can execute a CREATE PROCEDURE or an ALTER PROCEDURE script with incorrect table and column references in the MS SQL Server Management Studio and using ADO.NET commands. The scripts run ...
6
votes
1answer
263 views

Does the transaction isolation level affect indices as well?

Here's one for the SQL Server gurus: if I set my SQL Server 2008 transaction isolation level to READ UNCOMMITTED, does that also affect the index pages? E.g. using ISOLATION LEVEL READ UNCOMMITTED, ...
-2
votes
1answer
2k views

Query database by date, month, year

How can I query order by date. Like this: And the same for week, month, year...?
3
votes
3answers
1k views

Does sp_spaceused data contain more than the sum of each table data?

I wanna monitor the size of each table in my database. After doing so, I was wondering why the sum of the data of each table does not correnspond to the data size of the whole database I get after ...
10
votes
3answers
7k views

Where can I find example databases for MySQL, SQL Server and Oracle?

I want to experiment with the 3 large database management systems. For this purpose it would be cool to have the same database (the same tables, etc.) for each of those. Where can I find sql scripts ...
1
vote
2answers
315 views

Update primary key

I want to update a primary key column, but the change should cascade to all other child tables where this primary key is used as foreign key. Example: table1 has column "slug" as primary key. One row ...
2
votes
1answer
3k views

Save Transaction: Is the name local to the stored procedure or not?

Some foot shooting just occured on a production server. I fixed the problem, but I'm now rather confused. There is a subset of stored procedures that preserve state on failure. That is, if the ...
6
votes
3answers
4k views

SQL Server Primary key / clustered index design decision

Looking for some advice regarding a table / index design decision I've got to make on some tables that I've got to port into SQL server from an existing 4GL based database. I've got a product history ...
2
votes
1answer
7k views

Error importing back a postgres db after dumping

I dumped my postgres db using pgAdmin in plain format because I wanted to search for some text on it. After doing the search, I decided to import the db back from the sql query window but I get this ...
0
votes
1answer
189 views

Connect to a Windows Authentication SQL server in SQL Server Authentication mode?

Is it possible to connect to a SQL server in SQL Server Authentication if the server has been installed with Windows Authentication?
14
votes
3answers
48k views

Taking MySQL dump from another machine

I have a MySQL db on Machine A and I want to access the mysqldump from machine B. Both machines are running on Linux and I also have the credentials of both, but I can't access the mysqldump. What ...
2
votes
2answers
780 views

Tracking of deleted records who delete the transaction in SQL server 2008r2

how can we check who deleted the transaction even after few days in sql server 2008 r2 is there any command instead of logs
5
votes
2answers
6k views

Ibdata usage and Recommendations?

I have a Production server On November 5,2011 the ibdata size was 100G. In Approximate 3 months it is increased to 200G.So it has just doubled its size.So it is a Huge Data.Currently lvm is 251G. I ...
2
votes
2answers
2k views

Slony lib not found

Trying to run the example slony config script in the documentation but getting the following error: postgres$ /tmp/slonik_example.sh <stdin>:8: PGRES_FATAL_ERROR load '$libdir/slony1_funcs'; ...
7
votes
2answers
11k views

Fastest validation query in PostgreSQL

What is the fastest query in PostgreSQL, which I can use as a validationQuery binding a JNDI resource? I though that SELECT 1 is the simplest, but in this document it is said that in PostgreSQL we ...

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