The discipline of Operational and Architectural Management of Database Systems.

learn more… | top users | synonyms

2
votes
1answer
654 views

Create a sub query for sum data as a new column in SQL Server

Suppose that I have a table named tblTemp which has this data: | ID | AMOUNT | ---------------- | 1 | 10 | | 1-1 | 20 | | 1-2 | 30 | | 1-3 | 40 | | 2 | 50 | | 3 | 60 | ...
0
votes
1answer
374 views

Security Concerns of SQL Server Express for Web e-Voting web application

I am building a database driven web application. The web application is basically an E-Voting website, where users can register and vote on things that concern their community ... etc. The database ...
3
votes
1answer
6k 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 ...
2
votes
3answers
638 views

Copy database to local from server [duplicate]

As I show , I have server database version-10.50.1600 and local database version-10.0.1600 . How can I copy database (with all tables and data(s)) from server to local which has different version ? ...
2
votes
3answers
272 views

Oracle error : Shutdown immediate error

echo $ORACLE_SID YBRD conn sys/hello as sysdba SQL>shutdown immediate Then I was waiting for it to shutdown for a couple of minutes. It didn't, so I closed my window. Then I again logged in and ...
2
votes
1answer
172 views

Will a primary key be added as a clustered index?

I've inherited a database where no primary keys were defined on the tables. There are also no clustered indexes assigned to the tables. If I perform an alter table to assign a primary key will this ...
2
votes
1answer
3k views

How to restore IBM DB2 database from AIX to Windows?

I had made backup from remote IBM DB2 server in AIX using this command: ./db2 backup database DBEMP to /home/dbemp/backup Then I grab the backup file using FTP Client from my Windows. I run this ...
4
votes
2answers
2k views

One filegroup, multiple datafiles, how to get list of tables in each file

In one of my production databases, I have a filegroup with 3 data files sitting on 3 different disks. There are over 50 tables on this filegroup. How do I identify the location of each of the 50 ...
1
vote
1answer
2k views

ERROR 13 (HY000) When Creating Database

I'm trying to create a database and when I type in CREATE DATABASE epik; I get the error ERROR 13 (HY000): Can't get stat of './epik' (Errcode: 13) I am running kubuntu 13.04 with mysql 5.5.31.
3
votes
1answer
327 views

Load Testing Crash Course

Can someone point me at a good resource to get a crash course in load testing. I have a sql server machine that I need to load test but I havent been thruogh the process before. Also we do not have ...
4
votes
2answers
17k views

How to backup IBM DB2 Database online?

I tried to backup the IBM DB2 (LUW) Database using this command: ./db2 backup database DBEMP to /home/user1/db2bkup But I got this message: SQL1035N The database is currently in use. ...
-1
votes
1answer
494 views

How to merge data from 2 databases [duplicate]

I have a SQL-Server database that crashed while I was away on vacation. All info from 5/2/13 is missing from our current database because my replacement implemented a back-up of the database from ...
1
vote
1answer
7k views

IBM DB2 Database name not found but I can connect using IBM Data Studio. What happened?

In IBM Data Studio, I can create a connection to a remote IBM DB2 LUW database named DBEMP and browse the schema and data. Here is the steps to create the database connection: From IBM Data Studio, ...
1
vote
1answer
1k 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
173 views

Syntax error when trying to import database from two PostgreSQL databases

Following on from this prior question, I'm trying to export a database from one server and put it on another using phpPgAdmin. My process is like this: select the database in server 1 and hit the ...
2
votes
1answer
5k views

How to run DB Admin Tool (GUI) in IBM DB2 Express-C?

I had installed IBM DB2 Express-C in Windows but I can't find any shortcut to launch the Administration Tools (GUI). When installing, I had selected "Administration Tool" option (I had checked twice ...
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 ...
3
votes
1answer
759 views

MySQL specific database configuration file

In MySQL's configuration file I've globally disabled autocommit as so. [mysqld] autocommit=0 I need to turn MySQL's autocommit on for a specific Ruby on Rails database though. It could be for the ...
-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 ...
1
vote
1answer
206 views

How to allow a user to create databases only with a certain prefix?

We're having a multi-user Linux server. I'd like to give each user the ability to create and manage databases at will, but to keep things sane, force them that each database name they create must ...
3
votes
2answers
355 views

Reducing Log Impact During Re-Indexing

We use Ola's maintenance solution and its great. Regardless of method for re-indexing a major friction point with IT is the amount of log generated during the weekly re-indexing process. For a 1TB ...
0
votes
2answers
1k views

Oracle database uses wrong parameter file

When I try to startup my Oracle database I get the following error: LRM-00109: could not open parameter file '/opt/app/oracle/product/11.2.0/db_1/dbs/initjicdbaex.ora' The /dbs directory in my ...
1
vote
1answer
378 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 ...
4
votes
1answer
269 views

High amount of Read Misses and Pages To Be Flushed

I am running a mysql database backend for a Moodle installation, and after a few months performance really starts to suffer (Up to 30 seconds for some pages to load). Under investigation in the InnoDB ...
3
votes
4answers
1k views

What is the best permissions to set for only creating and managing own databases?

I want to create a login for a new user who could only create and manage their own databases. Other databases on the server should be read-only to that user. What would be a good set of ...
1
vote
1answer
132 views

Public Database for Mobile Application

What are the proper steps to hosting a public database. Currently I a building a mobile application with Adobe Flash Builder. I have used Microsoft SQL Server, My SQL as well as WAMP Server. All of ...
5
votes
1answer
4k views

Could too many idle connections affect PostgreSQL 9.2 performance?

Some queries on my database server seem to take a long time to respond, and I believe the CPU usage is high. When running ps aux, I see ~250 "idle" connections (which I believe to be too many). I ...
1
vote
0answers
302 views

Database Timeout Error from VB Application

Recently we are receiving so many database timeout error from different servers we are using vb application -- which will use ODBC connection to connect database - here no problem when we run the ...
1
vote
1answer
52 views

Adding users to a list and sort by category?

I'm using SQL-Server 2012 and I would like to know how to solve this program. So: I want to create a page that allows admins to manage a project, and part of it, would be to add members/employees to ...
0
votes
1answer
141 views

How to deny access to see the logins in a database

I create a login in SQL Server 2008 R2, and when that user connects to a database, it can see all the logins in the security logins. Can I deny access to watch the logins of the database?
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
0answers
250 views

How to execute a non-table-locking update operation on PostgreSQL? [closed]

Looking for a good way to update the value on a column for all the rows in a database (not huge, but big enough - about 10M records), without locking the whole table, so operations can continue while ...
0
votes
0answers
613 views

DBA group in Linux

When we need to install Oracle database in Linux then the user should be in dba group. What is this group and why the user should be in this group for installing Oracle database. What happens if the ...
1
vote
1answer
1k views

Insert from one row to another using cases

My original table was(being used since 2005): CREATE TABLE `request` ( `msg` VARCHAR(150) NOT NULL, `id` VARCHAR(20) NOT NULL, `ctg` VARCHAR(10) NOT NULL DEFAULT 'misc', `date` ...
6
votes
1answer
288 views

Role of Database Administrators

I am currently working as an application developer on a project which involves the creation of a new SQL Server database. I am actively working with a group of DBAs who will play some role in the ...
4
votes
1answer
515 views

SQL Server Restore from one database to another

One of our devs backed up a dev database, and then restored it in production. It's a new database for a new app that was deployed last night intentionally to prod. Now in the backupset table ...
18
votes
2answers
4k 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 ...
9
votes
2answers
2k views

100 TeraBytes Capacity Database - Resources and Time Estimates

I am working on a 'back of the envelope' calculation for a 100TB reporting database setup. I am seeking out thoughts from the experts here. Proposed environment: Storage Capacity ~ 100TB Tables ~ ...
2
votes
1answer
970 views

Create database on new partition

I use postgresql 9.1, on ubuntu 12.04. I had installed the depot package. I have added a new partition to my system, and I would like to create a postgresql database on this partition ( which will be ...
2
votes
3answers
1k views

Database Design Relationship for Patient Visit in MS Access

I am designing a database to store records for research purposes, and I am having trouble picturing how I can create a relational database based on the information I have. There are a total of 6 ...
6
votes
1answer
167 views

What is a good way to determine the performance I should expect from a PostgreSQL server?

Trying to figure out how I should expect my database to perform. Basically, I need to determine when the server I have set up is reaching its performance limits - which would help me plan server ...
4
votes
1answer
194 views

After Rackspace server creation, PostgreSQL query planner doesn't work as expected

We created an image of one of our database servers in Rackspace. Then, we created a new server using that image, expecting things to work. However, the index performance we have seen seems to be ...
9
votes
4answers
11k 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; ...
5
votes
2answers
654 views

How to properly configure PostgreSQL RAM usage?

Using PostgreSQL, we have several hundred concurrent processes doing regular database access. We have our data spread out through several database servers, each of which houses a connection pool with ...
3
votes
0answers
435 views

How to properly configure pgBouncer transaction level pooling?

What is a good way to determine the number of available transaction connections when using pgBouncer to pool database connections? Also, how should I determine the number of max_connections and ...
2
votes
2answers
3k 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 ...
6
votes
2answers
2k views

Two corrupted indexes found by DBCC CheckTable

I'm wondering if this problem is solvable by dropping/recreating the two indexes. Both are rarely used, nonclustered, non PK, non FK indexes. Here is the dbcc output: Table error: table ...
15
votes
2answers
84k views

oracle - list users with access to certain tables

I'm sure this has been asked before but I can't seem to find the relevant details for the following. Is there some sort of pre-built table that can do the following (I have used dba_tab_privs but it ...
0
votes
1answer
189 views

What is the maximum number of rows in a clustered index on datetime column?

I would like know what the max no of rows is in a clustered index (non-unique) on a datetime column table in SQL Server 2008R2.
2
votes
2answers
256 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 ...