The discipline of Operational and Architectural Management of Database Systems.

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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 ...
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 ...
2
votes
1answer
1k views

MySQL : “FLUSH TABLES WITH READ LOCK” started automatically

I would like to understand how this happened. I was running a query that would take a long time, but should not lock up any table. However, my dbs were practically down - it seems like it was being ...
11
votes
3answers
5k views

SQL Server 2008 R2 “Ghost Memory”?

We have a dedicated SQL Server 2008 R2 machine that is experiencing some strange memory issues.. The machine itself has plenty of resources including two quad-core processors, 16gb of RAM and 64bit ...
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
895 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
584 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
475 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, ...
1
vote
1answer
222 views

Do you feel like DBA/DBD Is a “secure Field” still? [closed]

I noticed recently alot of Database jobs/Development have kind been pushed onto general developers, not to mention with NoSQL Solutions (Which IMO are probably a little easier for Non-DBA's to throw ...
0
votes
1answer
396 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 ...
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> ...
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 ...
2
votes
1answer
412 views

PostgreSQL archive_command on Windows

What is the best method for WAL log transfer on Windows? I have two servers with Windows Server 2008, PostgreSQL 9.0 64bit. Servers do not have any shared SAN disk, they are on different hosts, ...
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 ...
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
418 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)) ...
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.
0
votes
1answer
619 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 ...
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. ...
2
votes
4answers
209 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 ...
5
votes
1answer
273 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 ...
6
votes
2answers
229 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: ...
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 ...
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
425 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.
-1
votes
2answers
1k views

Data Base Administration Oracle vs MySql? [closed]

I have worked with MSSQL for a while now, but now we want to try to move to some open source for a specific part of the company's products or explore Oracle if possible. What would you say are the ...
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
435 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 ...
5
votes
2answers
685 views

Running each SQL Server service under different Windows accounts

Besides the Database Engine, SQL Server has some additional Services, namely: SQL Server Integration Services SQL Server Analysis Services SQL Server Reporting Services SQL Server Agent Should ...
5
votes
2answers
422 views

SQL Server - DBO without Backup

Similar to my previous Question : Prevent Non Copy Only Backups, how do I create a user that can do everything to my database take backups at all. I've granted them every role except ...
21
votes
2answers
9k views

What does a DBA have to know about SSAS?

I've seen a lot of material covering the business aspect of SSAS, but not really much about the important aspects of administration and management. From the point of view of administering an instance ...
10
votes
1answer
479 views

What does a SQL Server DBA need to know about Windows Server?

Analogous to my previous question What does a DBA have to know about SSAS?, which generated a really wonderful answer (thank you, @ConcernedOfTunbridgeWells!), I now ask a similiar question: What ...
2
votes
1answer
122 views

MySQL switch between data directories for individual databases

I'm in the middle of designing a solution to an issue we're currently experiencing while writing to certain large MyISAM tables. The database in question basically stores information regarding two ...
9
votes
2answers
381 views

Which areas of a DBA's knowledge should a developer delve into? [closed]

I must admit the question is quite broad, so I'll try narrowing it down a bit. In our company we are 3-4 developers and have some SQL Server based installations running at our customer's sites ...
12
votes
4answers
17k views

How do you identify InnoDB table corruption?

I have some tables that are partitioned and have several indexes on a replicated slave. After copying the snap shot (verified safe) to a new slave and upgrading mysqld from 5.1.42 to 5.5.15 and ...
2
votes
2answers
662 views

How to compare performances of two databases

There are two database servers and I want to compare their performances. Both have Windows operating system and and Oracle (10.2.0.4 and 11.0.2) database. Both are OLAP databases with 15-20 users ...
4
votes
2answers
2k views

efficient way to poll database?

I have a Linux CentOS server hosting an Oracle 11.2 database, which communicates with an application server, which communicates with a client (a Flex application). I'll try to describe the pseudo-code ...
1
vote
2answers
324 views

Is it good practice to assign a system account for database owner?

I can see the owners of my databases usign this query SELECT name , SUSER_SNAME(owner_sid) FROM sys.databases What are the things I should consider when choosing an account for database ...
7
votes
3answers
248 views

How do you protect against malicious PREPROCESSOR attacks in Oracle External Tables?

I'm a new DBA and I recently found out about the option of External Tables in Oracle using the PREPROCESSOR feature ( ...
6
votes
1answer
167 views

On-the-fly query/command modification

I'm responsible for administrating an instance of SQL Server 200x which has the misfortune of serving as a backend to a turnkey application written with a disgusting performance problem. It repeatedly ...
24
votes
20answers
1k views

How to dive into an ugly database?

I'm sure many of you are/were dealing with a ugly database. You know, that database that isn't normalized at all, that database where you have to do a large painfully query to get the most trivial ...
2
votes
1answer
1k views

How to upgrade MySQL to a New version..?

I have installed mysql using the package management system.I am using ubuntu machine. After that i have very well configured the server for InnoDB and other server related parameters. I am using the ...
3
votes
2answers
1k views

VACUUM and VACUUM FULL do not return space to OS

I'm running Postgres 8.3.3. I have a postgres database on a Linux filesystem that is quite full. I've run VACUUM and VACUUM FULL, yet none of the space has been returned to the OS. When I observe ...