The discipline of Operational and Architectural Management of Database Systems.

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2answers
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How to Correctly Estimate the Average Number of I/O Operations my RAID 10 disk can offer?

The average Input/Output Operations per Second a disk can sustain is a very important factor in the tuning of MySQL / InnoDB databases, as it drives the speed with which Dirty InnoDB Buffer Pool pages ...
2
votes
1answer
128 views

Tools and methodologies to keep to DBs aligned [closed]

2 DBs having schemas that represent the same semantic objects. The first one is production DB (Non-RDBMS, in-house implemented in-memory DB with shitload of RAM). Other is Postgres. Once in a while ...
1
vote
3answers
219 views

An admin (GUI or shell tool) for managing all kinds of databases [closed]

I needed an interface/admin (web or desktop) from which I could manage all the databases in my system. Currently I use separate admins for each (phpmyadmin for mysql, pgadmin/phppgadmin for postgres, ...
0
votes
2answers
2k views

Restore the latest backup on the database

We have a stored proc which takes the backup from a database to the specified location. Sometimes the backup process runs more than once. It causes having more than one backup set on the same file ...
3
votes
3answers
6k views

Detecting SQL Server Utilization with a query

My current project will send queries to an sql server constantly and It may use 100% of the memory or CPU. How can I check if the server is nearing full utilization in a stored procedure so that I ...
0
votes
1answer
2k views

mysql fine tuning: open_tables, opened_tables

I'm a novice to database administration and have been depending on forum suggestions and answers to help resolve my database hang ups and too many connections errors; I've managed to reduce the ...
2
votes
1answer
8k views

unable to login oracle as sysdba

I just got 11gR2 running and was able to conn as sysdba. I shutdown and started up the database to mount a new pfile. Now, I cannot login as sysdba. My parameter for password file is: ...
1
vote
1answer
697 views

MySQL Tables crashing randomly

This is one of the many random Tables that get corrupted. Any ideas why and what would be causing this? How do I keep MySQL tables from crashing and MySQL from crashing? Repairing USR_wp537 ...
2
votes
2answers
238 views

Database Is In InRecovery Mode.

I have a database that has entered "Recovery Mode". It was working fine, but ended up in this status a few days ago. I have been told that a cause can be the partition holding the datafiles running ...
3
votes
1answer
1k views

Mysql - show results from 3 tables excluding NULL or EMPTY values for certain fields

I have 3 simple tables with polls, users and votes. I'd like to show all polls ordered by clean count of votes (sometimes either poll_id or user_id don't get inserted). Furthermore I'd like to show ...
9
votes
3answers
261 views

How to tackle a large undocumented database

I recently got hired as the only IT Guy in a certain Company X and I am tasked to fix their applications, and in my opinion, the best way to start is by understanding the database. Their current ...
2
votes
1answer
194 views

How can I rename a table, but also all FK etc. references to that table?

I would like to e.g. rename my Applicant table to ApplicantProfile, as applicant is an abstract entity that has a profile. The profile is not the applicant. Simply renaming the table is hopelessly ...
1
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2answers
1k views

How to identify the db orphan mdf and ldf files

I want to identify the orphan mdf and ldf files on the disk and remove them. After searching on the internet, found the script below on MSDN forum. But when I run the script it returns many ...
1
vote
1answer
803 views

Connecting to a SQL Server database from a Flash program [closed]

I currently have the ability to utilize Microsoft SQL Server 2012. I am developing a project with Adobe Flash Builder 4.7. If I link my database with Adobe Flash Builder is there any additional ...
0
votes
1answer
853 views

“connectivity libraries needed are not found” error in IBM Data Studio

UPDATE I am getting the following error when I try to create a new database in IBM Data Studio v3.1.1.0. The connectivity libraries that are needed for local or remote non-JDBC operations were not ...
3
votes
2answers
676 views

Perl vs Ksh for Unix Database Administration

I realize this is a somewhat more subjective question, but I am looking to the community for guidance. Our company is fairly new to having DBAs. We used to use DB2 for i on the IBM's iSeries servers, ...
0
votes
2answers
415 views

Remote database connection problem?

I have two systems with Windows XP. I have installed SQL Server 2005 on a system and tried to use SQL Server Management Studio Express on both to use the database. I am able to use the database on ...
2
votes
2answers
451 views

How to login in database if we have lost password? [duplicate]

Possible Duplicate: gain admin access to sql express 2008 Is there any idea if we lost our password to login in database using sql express management studio? Is there any place where ...
1
vote
1answer
2k views

listener does not currently know of SID given in connect descriptor in oracle 10g and solaris 10 env

I have a oracle 10g database in solaris 10 system. The SID=OTRS, I can connect to oracle database from local server itself. But I can not able connect from another client. It is returning an error ...
5
votes
1answer
4k views

ERROR: database “dbname” does not exist

According to the documentation, so long as I'm not connected to a database, I can either delete a database in the console using: DROP DATABASE dbname; Or I can drop it using the wrapper tool ...
0
votes
1answer
68 views

PostgresSQL: Cannot get to console under different user name

I normally get to the console in UBUNTU by typing: sudo -u postgres psql But I need to delete a database owned by a different user. When I type: sudo -u username psql It tells me "database ...
2
votes
1answer
3k views

Is there a progress indicator for OPTIMIZE TABLE progress?

MySQL 5.1.4x (Windows) | Innodb I recently purged data from a mySQL DB (a few hundred thousand rows) and I'm planning to use OPTIMIZE TABLE LOGTABLEFOO1,LOGTABLEFOO2,LOGTABLEFOO3; to reduce the ...
5
votes
1answer
559 views

Expanding a partitioned table

I have a table that holds four years of data, where for each month I have a partition that is based on a filegroup with two files. Unexpectedly, I received eight more years of data and prepared the ...
2
votes
2answers
95 views

Searching transaction logs for changes

I currently have a database with an attached CMS. The CMS has about 50+ people with various permission levels that can log in etc... I would like to know if there is a way I can look at the ...
2
votes
1answer
2k views

Solve conflict between affinity mask and I/O affinity mask?

I executed this on one of our SQL Server machines: EXEC sp_configure 'show advanced options', 1 And then executed RECONFIGURE. This presented me with the following error message: The affinity ...
1
vote
0answers
206 views

Database instance keeps restarting

From the past few days, our MySQL database instance has crashed and had to be restarted a few times. My MySQL version is 5.1.57-log. The CPU and memory usage was way below 50% during the crash time. I ...
5
votes
1answer
3k views

Appending backups while overwriting expired sets

I've been reading up on this, but the online documentation is a bit difficult to understand and seems awkwardly written. For example the INIT, NOINIT. One says it will try to overwrite everything. ...
4
votes
1answer
2k views

Take individual MySQL database offline

MySQL does not have any SQL commands or internal mechanisms for making an individual database unavailable / offline moving an individual database Thtis being the case, how can you take an ...
2
votes
2answers
283 views

Database structure for a system with multisite

The system I'm working is structured as below. Given that I'm planning to use Joomla as the base. a(www.a.com),b(www.b.com),c(www.c.com) are search portals which allows user to to search for ...
0
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0answers
2k views

Achieve log transfer to standby (Data Guard)

I am not able to transfer my archive logs from primary to standby. I executed the following query: archive log list Database log mode Archive ...
-4
votes
1answer
109 views

Advice for designing a complex/multipart application [closed]

I'm designing a software application for my medical carrier. It is very complicated, with many parts and many small details. Some experts advised me to divide it to parts, then design the database ...
1
vote
1answer
4k views

DBF file exist while user has been dropped?

I am new to Oracle. I have dropped some users from my database using: DROP USER username cascade; The issue is that the .dbf file still exists in the $ORACLE_HOME/dbs/oradata/ directory, which is ...
2
votes
0answers
1k views

Standby controlfile error

I am doing dataguard. I have manually done a backup for the standby database. It was working fine. Problem arose when I used the standby controlfile. On the primary, I have created a standby ...
4
votes
2answers
668 views

Isolation Level for a Data Warehouse

We are building out a data warehouse (and also some data marts as well) in our organization. My DBA skills have mostly been on OLTP type applications, but I am moving into supporting OLAP for our ...
6
votes
1answer
4k views

Moving postgresql data to different drive

I am using AWS as my cloud environment. I installed PostgreSQL on the same drive as my root instance volume. I have attached and mounted the second drive to my instance. Now I want to move all my ...
3
votes
1answer
5k views

How to connect multiple users/schemas in Oracle 11g?

I'm almost new user to databases, so I think I'm doing something wrong. I have the database created. I created 3 users, 1 it's an Admin, 2 are just users. I created 2 roles, 1 for the Admin and 2 ...
1
vote
1answer
345 views

mysql session logging tables

I've been building a session logging system for our sites. We get around ~15m hits a year and at the moment we're really only interested in stats about people who logon to our sites. Our table ...
1
vote
1answer
341 views

Upgrade production database during software development lifecycle

Background Using Oracle, there are a number of tools that help with migrating and applying development changes into the production environment (such as Embarcadero Change Manager). These tools can be ...
0
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2answers
89 views

what is the best choice from those two tables?

what is the best choice from those tables?? table A : keep DB simple with lower number of tables ... but i will find difficulties if i wanted to extract certain data from column of doses coz it's ...
1
vote
3answers
3k views

Instance Startup Modes & Shutdown Modes

So, I know that there are 3 modes of startup modes available for the instance which is NOMOUNT, MOUNT, and OPEN. What I want to know is in NOMOUNT mode it is stated that the instance started but still ...
2
votes
1answer
1k views

Recover database until cancel without prompt?

The statement: RECOVER DATABASE UNTIL CANCEL prompts once to select the archive log file. Is there a way to pre specify the value so as to be able to use it in a script without prompt? I have ...
1
vote
1answer
138 views

a question in tables relations

Table A is linked to Table B , and Table B is linked to Table C using primary and foreign keys My questions: Should i link Table A to Table C too?? Or Table B can act as intermediate link between ...
1
vote
1answer
90 views

Tables of a huge database

When I work on a huge database, and after following normalization rules, I found that I have many tables for each part of my huge database. That makes me worry about the final number of tables, it ...
0
votes
3answers
376 views

How do I enable READ-only (passive) mode in a particular RDBMS?

As most of you have noticed all StackExchange sites have been under maintenance/recovery a few days ago so they switched on READ-only mode. From their blog I know they used to use MS SQL Server 2008, ...
0
votes
2answers
1k views

Difference between chained and migrated rows

What is the difference between chained and migrated rows? Also what query should be used to display these rows? (I'm using Oracle 11gR2 database)
-1
votes
1answer
73 views

Can I make that connection?

If I have a column with data type varchar(max) in a table that contains a big piece of text, can I make a connection between a word or a sentence in that text with another word or a sentence in ...
0
votes
1answer
250 views

Patients profiles database

I am making software for patients in hospitals. I want to make an option that if a doctor has prescribed a drug that interacts with another drug that the patient already uses, a warning will appear ...
2
votes
3answers
15k views

Unable to start SQL Server Instance 2008 R2 - DB file corrupt

I was not able to start the SQL Server 2008 R2 production DB instance. After reading the log file error message is " The log scan number passed to log scan in database ‘master’ is not valid. This ...
1
vote
1answer
960 views

Data dictionary best practices in SQL Server 2008 r2 [closed]

We are interested in sharing the meta data and data dictionary among the team. I know that we can use the Extended Properties for this purpose, but based on my experience I've seen it gets out of date ...
0
votes
1answer
1k views

TSQL query for viewing start/end of all SQL Agent jobs yesterday

See this related query: What's a good tool for visualizing SQL Agent jobs? I'm not after a visual tool however, since I am looking to build my own visualisation. This is my starting point, but ...