The discipline of Operational and Architectural Management of Database Systems.

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-3
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1answer
1k views

Single query to copy data from 3 tables into a single empty table

In an interview today, I was asked if I could write a single query to copy data from 3 source tables to an empty destination table. I started saying "I will use a temp table or table variables", ...
2
votes
0answers
320 views

SQL Server SSIS issue retrieve data when i enter into login of server side?

can any one try solve my problem here i am facing a problem Failed to retrieve data when i enter into login of server side here is the error message TITLE: Microsoft SQL Server Management Studio ...
2
votes
2answers
382 views

Help with Vehicle Service database

I am using the Desktop Vehicle Maintenance template in access, but i am trying to cater it towards our farms needs. We will be keeping track of the service's done on Trucks, Tractors, Equipment, etc. ...
0
votes
1answer
452 views

Unable to restore database in Oracle 10g

I created a database backup using the expdp command in Oracle 10g. The backup appears to be created successfully. However, while restoring using impdp command I get the following error message. ...
6
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3answers
308 views

Can I check the services currently running through SSMS?

I want to check which services has started and which has not by running a script/query on SSMS.
4
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1answer
371 views

Can I check what the allocation unit size is on my drives via a query?

Assuming that I do not have access to windows server, can I run a script from SSMS that would allow me to check whether allocation unit size is formatted with 64K?
12
votes
1answer
852 views

Are there reasons why I should not set my db owner to [sa]?

Yesterday I asked this question regarding changing the dbo of multiple databases that I have. The change makes sense, but I want to be clear. Is there any, good reason or circumstance why I should ...
1
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3answers
3k views

Unable to mount oracle instance

I am trying to shutdown the system, then I want to mount it. I have tried this: SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount; ...
2
votes
1answer
217 views

Active Directory domain being shutdown— Do I have to update my DBO accounts?

I manage a SQL Server machine (with SQL Server 2000 and 2005 installed) that was first created on an Active Directory domain that we are transitioning away from and are about to shut down. All of my ...
3
votes
2answers
3k views

pt-table-checksum help required

I am trying to figure out pt-table-checksum, as I am using it for the first time. It look likes the documentation is complex and not easy to understand stuff. I have a complex replication topology ...
6
votes
1answer
3k views

Capabilities of InnoDB INSERT Performance

Hi I am running the most recent version of Percona Server. Server version: 5.5.24-55 Percona Server (GPL), Release 26.0 I have a 10 cpu box of these characteristics. processor : 0 vendor_id ...
3
votes
1answer
70 views

Administration of MySQL Users

What is the best practice for keeping and maintaining MySQL users? Say for example I have 5 programmers and a PHP application connecting to a database. Should I create 6 different users 1 for each ...
2
votes
2answers
99 views

which option is better for not slow down the performance of queries?

I am developing a system that records customer payments, when a customer makes a payment, the system must update the account and show the payment made and all previous payments, is here when the ...
-1
votes
1answer
900 views

What exactly is SOLR? [closed]

It seems like a magical technology that can Do spatial search do full text search The problem is, It doesn't say where does it store all the data. Does it have it's own proprietary database If it ...
0
votes
2answers
585 views

DBA to work from home [closed]

I was wondering is it feasible or doable to work from home as a DBA or Database designer/developer or Business intelligence developer. I have seen developers doing great working from home, but can ...
2
votes
0answers
476 views

SQL Developer Data Modeller and Data Dictionary question

I'm not a DBA but I am a (mostly!) competent SQL report writer. Can I trouble you DBAs for some pro-knowledge, please? I can connect SQL Developer to Oracle XE's data dictionary without any problem, ...
0
votes
1answer
397 views

What are commonly used database types? [closed]

There are a lot of database types. Can you list a list of the top classification of databases commonly found in schools and offices? Any help is appreciated. Hope to see compressed and summarized type ...
3
votes
2answers
470 views

What exactly is “pinning” in relation to indexes?

When one talks about "pinning" in indexes, what exactly is this? Is there some other word/term I can search for, as google has not provided any solutions. It is part of a test question, where ...
1
vote
1answer
76 views

Clarification on Cloud Computing Database

This question can be very generic, but I am trying to understand the concept of Cloud Databases. Let's say I have a Web Application, a Desktop Application, and Apps for my Web Application. All of my ...
6
votes
2answers
996 views

Stored Procedures Best Practices: Fenced or Unfenced?

I believe I understand the reasons behind fenced and unfenced stored procedures. Fenced run "outside" of the database (in our case DB2) so as to prevent possible corruption of the database engine ...
1
vote
1answer
76 views

Oracle DB administrator-specific security features

Yesterday I was presenting an internet banking solution to a potential client management. My offer is based on using MS SQL Server 2008 RDBMS. One of the client's officers mentioned, that Oracle's ...
3
votes
2answers
117 views

Inconsistent information from different DMVs

I've a server with 12 GB of physical RAM. I just lowered its 'Max Server Memory (MB)' setting from 10 GB to 8 GB. If I look at the processes' committed memory in Perfmon, I see: select * from ...
6
votes
3answers
3k views

Database Administrator vs Database Architect?

In terms of job responsibilities and activities, what is the difference between a Database Administrator (DBA) and a Database Architect?
2
votes
3answers
419 views

MySQL - Master/Slave Replication with different server specs

I have a Master/Slave replication (using MySql 5.1 / InnoDB). Currently both my master & slave are running on the same type of server (32 GB RAM, 2 x Intel Xeon 5520 Quad Core 2.26 GHz (8 cores)) ...
1
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4answers
4k views

What is the purpose of having a table NOT LOGGED INITIALLY

I came across this recently. When defining a table in DB2 LUW (at least 9.5 or higher), you can define it as NOT LOGGED INITIALLY. Example from the book I read: CREATE TABLE products ( productID ...
1
vote
3answers
169 views

What are the challenges of administrating an International stock trading database?

I am a student, and have a question for an assignment: What problems and challenges do database administrators face when designing systems to trade international stocks in real time and 24 hours a ...
4
votes
1answer
2k views

823 errors on tempdb

Have a couple Fiber channel SAN-attached cluster servers which have been intermittently reporting errors like: 2012-05-09 16:31:54.13 spid74 Error: 823, Severity: 24, State: 2. 2012-05-09 ...
3
votes
2answers
2k views

Why can the SA account no longer access the master database?

I'm somewhat stuck. We have a database server which was set up and configured by a third party. It's for a third party product so unfortunately we're stuck with the way they've configured it. Their ...
0
votes
1answer
327 views

RAID vs Replication [closed]

I'm kind confuse about it, can some one give me a hand with this... Differences. Which one is better. Which one do you use and why? Personal Opinion and advise.
2
votes
2answers
2k views

Cannot login to Oracle11g with System username

I just installed Oracle 11g into my machine. I was about to shut down a database instance, and Oracle asked me for username and password, I provided the credentials I used to login into the web ...
5
votes
1answer
1k views

Mongo Collection `Size` is *larger* than `storageSize`?

I recently compacted my collection using the command: db.<collectionName>.runCommand( "compact" ) And now my collection size seems to be bigger than size on disk! SECONDARY> ...
2
votes
1answer
159 views

database connection time expired issue

I have a server machine and four client machine for database connectivity. I installed sqlexpress 2008 in server and one machine and all remaining systems, they have connected the database through ...
0
votes
1answer
85 views

Copy snapshot files from Publisher, Paste and Apply on subscriber in SQL Merge Replication

I read an excellent article about copying the snapshot files for Transactional replication from Publisher to Subscriber and Apply them on subscriber. ...
16
votes
2answers
3k views

Handling growing number of Tenants in Multi-tenant Database Architecture

Handling a modest number of customers (tenants) in a common server with separate databases for each tenant's instance of the application is relatively straightforward and is normally the correct way ...
5
votes
1answer
274 views

Is there a standard approach to rolling out database schema changes?

A developer said I should simply wrap all my database upgrade scripts in a transaction. If it fails, just roll back all changes. All my instincts tell me this is wrong, especially when it comes to ...
2
votes
4answers
210 views

MySql Database solution for specific web app problem

Well, I need to create a comment system for posts that people add to my web app. This web app is just like facebook or myspace posts. Users add posts and people can comment on them. But the problem is ...
6
votes
2answers
230 views

Automation of backups of Large Number of Database

In a multi-tenant web application where a database is set up for each tenant, the database can be backed up and restored manually through a fairly conventional approach. I am considering this type of ...
2
votes
2answers
77 views

Data Backup and Restoring the same if requried in SQL SERVER 2008

In Multi-tenancy , Shared Database Shared Schema. How to take Tenant level backup and restored the tenant data when required? Can any one guide me or point me to the right direction. Thanks!!! NB: ...
7
votes
1answer
10k views

What exactly is binding in DB2?

I recently crossed over from being a Java developer to an actual DBA in our company. I am learning the ropes, so to speak, about being a DBA (which is actually somewhat of a new position for our ...
1
vote
1answer
2k views

How can I move LOB_DATA ( varbinary/image/text) to different Filegroups

LOB_DATA : varbinary(max),varchar(max), image , text columns. I have 4 tables with large amount of LOB_DATA in it. I would like to move LOB_DATA in these tables to different File group in a different ...
1
vote
1answer
1k views

Solution to error NID-00135 in Oracle 10g, Solaris 10

We are trying to build a test version of a production database by restoring the production backup using RMAN and renaming the database to test. We've successfully restored and opened the database ...
8
votes
4answers
9k views

Why using innodb_file_per_table?

There are many articles exaggerating (IMHO of course) the need for innodb_file_per_table. I understand that with innodb_file_per_table, there should be a better control over the individual tables; ...
2
votes
2answers
3k views

How to deny drop permission for a table?

Is there a way to deny drop permissions for a specific table from a user or role?
2
votes
1answer
217 views

User Rights - Database Security

I am having following scenarios and i am having some issues and some questions. We have a DB Server on which we have some databases in these 2(two databases) are for my users. Now i have created 2 ...
5
votes
2answers
22k views

How to create Sql Server login for a domain account?

All, I have Sql Server 2008 installed on a server (let's say Server1) in a Domain (let's say AD). I also have a domain account called AD\Sql1. This is not an Admin account on the Domain (AD), but I ...
1
vote
1answer
426 views

Difference in between MySQL affected num rows and num rows

I am just newbie to the MySQL.I want to know what is the main differences in between mysql num rows and mysql affected num rows?Any example or references will be highly appreciable.
2
votes
1answer
278 views

How to recover SA account password without restoring it?

I forgot my SA password and resetting the password is out of the question because internal applications are using it and will will affect them. I also don't have an option to change the SA credentials ...
1
vote
1answer
437 views

How to get a unique highscore per user

I have the following tables: users, highscores I would like to get the top ten best results in highscore. The scores should be unique, meaning one score per user. I tried using INNER JOIN and GROUP ...
-1
votes
1answer
1k views

Difference in between HAS MANY and BELONGS TO in Yii framework [closed]

I am new to the Yii Framework. I discovered HAS MANY and BELONGS TO in the documentation, however I am confused about these features. Can someone give some real life examples with a diagram that ...
0
votes
1answer
620 views

Look for software that can convert sql (mysql) to erd

I would like to have an ER Diagarm in phpmyadmin, however, its graph is not up to my expectation, the graph has no relationship indicator (1-1) (1-m) etc at all. So i am wondering whether there is a ...