The discipline of Operational and Architectural Management of Database Systems.

learn more… | top users | synonyms

0
votes
2answers
78 views

SELECT fields from table having some conditions

I have two tables 1. Named as t1 2. Named as t2 example of the tables are : t1 : id name 1 one 2 two 3 three t2 : id name 2 five I need to select all the data ...
0
votes
3answers
932 views

SQL Server: unable to copy database

I'm trying to create a dev database so I don't create triggers and such on the production database. I use the right click -> Taks -> Copy, followed the wizard and the process starts. After maybe a ...
0
votes
1answer
292 views

Does redundancy exists in this table?

I'm studying a DB course and I found this table: In this exercise, the objective is to determine whether the table has redundancy or not. According to the definition of redundancy Data ...
0
votes
4answers
663 views

SQL Server 2005 - 2 sets of backups - 2 maintenance plans?

I did my best to search for an answer to this question and couldn't find a scenario quite like this. I'm a fairly new DBA in the sense that I haven't had a ton of training, I basically took the job ...
0
votes
1answer
134 views

Rotate Postgres log at 5GB

How to make postgres 9.1 log to have maximum size 5GB and to be circle when comes to 5GB ? At the moment my log file is over 500GB. /var/lib/postgres/
0
votes
1answer
1k views

What is blocking 'SELECT… WITH(NOLOCK)'?

While following BrentOzar's "How Much is Offline During an Index Rebuild?" I was curious to run: SELECT Quantity FROM [Production].[TransactionHistory] WITH(NOLOCK) while executing a rebuild ...
0
votes
3answers
900 views

MySQL Large DELETE with JOINs

I have a large table players with ~20MM rows which joins to a table stats with ~300MM rows, among others (photos, ...). I want to DELETE all records for players that were born_on before 1950. I ...
0
votes
1answer
206 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?
0
votes
2answers
482 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 ...
0
votes
2answers
1k 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 ...
0
votes
2answers
394 views

Is command BACKUP asynchronous operation

I got strange delays when backed up a group of databases (20 more) in one scope (TSQL) to the same file location. Is it possible that multiple backup operations are running at the same time? I have ...
0
votes
1answer
31 views

Accessing a Linked server [closed]

I am fairly new to the whole DBA scene. With that said, i was able to get an ODBC connection established within Microsoft SQL Server 2012 to be able to access a database for a library. Now what I am ...
0
votes
1answer
45 views

What happens when the buffer pool size is insufficient in mysql

Let us assume I run a query for a table whose size is very huge. My buffer pool size is as low as possible. What happens now? whether I will get an error regarding the insufficient space in buffer ...
0
votes
1answer
59 views

Open .mdf and .ldf files in Microsoft SQL Server without attach [closed]

I want to open .mdf and .ldf files in Microsoft SQL Server without attach. Are the following steps correct? Add new database with MYDBNAME name. Copy the files MYDBNAME.mdf / MYDBNAME_log.ldf to ...
0
votes
1answer
37 views

In what circumstances I am more likely to benefit from auto update stats async on?

I update statistics on a weekly basis using Ola Hallengren's solution. Based on the article below, I am considering enabling the Auto Stats Async and turning on trace flag 2371. Databases With ...
0
votes
1answer
58 views

Oracle 11G, Move indexes from one datafile to another

I have an Oracle 11G DB installed on Windows Server 2008 SP2 64bit OS. Below is some data files usage statistics: As you can see, there are two files: index01.dbf and index02.dbf belong to the same ...
0
votes
2answers
43 views

could not allocate a new page for database [closed]

Could not allocate a new page for database 'bteexamination' because of insufficient disk space in filegroup 'PRIMARY'. Create the necessary space by dropping objects in the filegroup, adding ...
0
votes
2answers
51 views

Practical Aspects of Making Changes to Databases [closed]

I am setting up my first database and have gone through the standard process of studying the business logic, figuring out the entities, associated fields and dependencies. This is the theoretical/...
0
votes
2answers
53 views

Replication : Delete from Master Database

Is it possible to delete certain data from Master Database and retain that data in the slave ? For, example I want to delete data of before 5 years from master. And I'm sure that data is not being ...
0
votes
1answer
108 views

How do you GRANT SELECT on hidden resource database mssqlsystemresource?

I get an error when I run this query: SELECT dependencies.referencing_id as object_id, dependencies.referencing_minor_id as column_id, dependencies.referenced_id AS ...
0
votes
2answers
431 views

MongoDB document delete and fragmentation

I've a MongoDB collection that works like a queue: new documents are insert and old documents (after 60days) are removed. I can see a rapid grown of the datafile size, too rapid. I can be reasonable ...
0
votes
2answers
105 views

Dynamic Filters in SQL server [closed]

I have problems with my dinamic filter in 'sql server'. My problem is that the filters aren't working. When I try to execute the store procedure I just get all the data without filtering. I'm new ...
0
votes
2answers
71 views

Listener.ora Location

What is the location of the Listener.Ora file in Windows OS? I need to edit that file and I am not able to locate where it is.
0
votes
2answers
159 views

'Use <database> ' statement not executing T-SQL

Okay, this seems funny for a simple script: but I really need this small piece to execute well. DECLARE @dbName NVARCHAR(50) SET @dbName = 'rx_lab' DECLARE @SQL02 NVARCHAR(MAX) SET @SQL02 = 'USE ['+ ...
0
votes
1answer
175 views

Trying to add permission to a Role is failing

I am trying to add a role into Create and Restore permissions and After researching online, it sounds like it should be as easy as using the GRANT statement. So far so good. However, my simple grant ...
0
votes
1answer
237 views

Data distribution in mongos with shards or replica sets

I am a newbie to mongodb.I have set an mongodb architecture with a single mongo shard(mongos) connected to three shards(replica sets) with three config servers. The architecture looks as below: Now ...
0
votes
1answer
14k views

Inserting data into multiple tables

For my system, students are required to create a user account by completing a registration form (personal, contact and course details; also username and password). I need to collect registration data ...
0
votes
2answers
331 views

Open Transaction that won't go away SPID Ns

There is a transaction that has been open on this instance since it was restarted and is preventing us from clearing the ldf. Here is the transaction information: Transaction information for ...
0
votes
2answers
3k 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)
0
votes
1answer
125 views

How are transactions logs inserted?

I have an ms-access database at work that has a table that's a transaction log. The table contains the following fields: Date - The date the transaction took place. Table_Name - Name of the ...
0
votes
1answer
1k views

WorkAround for PHP PDO(with libpq V 9.1.4) binding for use of CITEXT?

The scenario Two systems(not server) running PHP and PostgreSQL with the following versions Fedora 15: PHP PHP 5.3.13 (cli) (built: May 9 2012 14:38:35) Copyright (c) 1997-2012 The ...
0
votes
1answer
503 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
18 views

Overwrote database with old mysql dump. How can I restore it with a more recent backup

Have a server with multiple databases. Imported wrong .sql from over the top of existing database. I Have a rsync copy of the up to date files for that database. What do I need to do to just ...
0
votes
1answer
31 views

Log Backup in AlwaysOn

In our current process, log backup is done by log shipping backup job. Is there any need to configure backup job for transaction log in next AlwaysOn environment? If we must configure backup, we ...
0
votes
1answer
40 views

I'm a beginner, studying Data modelling as part of my course. I'm having trouble understanding Normalisation. How can i improve?

It was difficult to frame the title given the word limit, so apologies for that. Currently I'm studying DBA and Data modelling as a part of my ICT Apprenticeship course in a Web Development team. I'm ...
0
votes
1answer
37 views

Table/database design question

Suppose you have these fields to keep track of in records: (first_name, last_name, state_id, stateid_status, day, month, year, id_status, id, criminal_status, charge, plea, sentence, create_time, ...
0
votes
1answer
180 views

Huge database… queries too slow. How to improve performance? [closed]

I'm currently managing a MySQL database with 30 million rows(many more to come). The entire database is 280GB. The server has 4GB of RAM and 3.2Ghz 4 core processor. The largest column stores an array ...
0
votes
1answer
157 views

Apply SP3 on SQL Server 2012 AlwaysOn AAGs

If Always-On is configured, while applying Service Pack, should I: Directly move SQL Server Instance (Secondary Replica) to make it passive and apply Service Pack Or First move Availability Group ...
0
votes
2answers
84 views

Can Oracle databases start automatically when Windows machine is booted/rebooted?

In one of my client machines every time Windows starts we have to start the Oracle database manually. Is there a solution/ command to start the database automatically when the machine is started/...
0
votes
1answer
39 views

Database access: what should I do here?

I'll explain my situation here, I hope I'm posting this on the correct site, otherwise I'm sorry and I'll move this to somewhere else. I've built a Java program in order to control sales, inventory, ...
0
votes
1answer
564 views

can i shrink log file in full recovery model

i have configured Always on Availability group where iam unable to shrink log file size through simple recovery model. can i shrink the log file size in full recovery model if yes or possible then is ...
0
votes
1answer
77 views

Unable to start the services of SQL server after Downgrading from Enterprise to Standard

We are performing the downgrade activity from SQL server 2008 R2 Enterprise to Standard. After the uninstall and re-install the standard version, (once the saved system databases were copied to the ...
0
votes
1answer
153 views

Searching between dates on a CHAR type field

I have a table that has a field in which dates are stored, the problem is that the field type is CHAR(10) and I'm being asked to query for data between certain dates. I don't want to change the field ...
0
votes
2answers
345 views

Is there any other way that we can take auto backup in oracle 11g apart from RMAN?

I have tried with RMAN. But is there any other possible way that we can backup database and tables. backup using queries or stored procedures is possible?
0
votes
1answer
104 views

MySQL Performances Issues

I'm in debate with my database admin. He claims that my queries I'm sending through PHP are the problem and he is stating several things I believe are completely false. To begin I have a site ...
0
votes
1answer
63 views

How can I quantify the business value of normalization?

My company is developing an internal application with a SQL server database which was started earlier by another developer. Now I am Looking at the model,the developer has stopped at 1NF. I proposed ...
0
votes
1answer
176 views

Exadata RMAN vs. Non-Exadata RMAN - any differences?

Can you please let me know the differences, if any, in the architecture of the non-Exadata RMAN vs. that of the Exadata-RMAN from an SBT plugin perspective? Have you observed from your vast ...
0
votes
3answers
143 views

Database Design for Paper Submission System

I am learner of Database design, I want to design a database for a journal paper submission system in which one paper can be submitted by one or more author. I have initially two tables Author and ...
0
votes
1answer
59 views

Index file - size changed

I realised today that my index file(which is about 250GB) is smaller than yesterday for about 7GB. Everything, I done in the meantime, was index rebuild. Is it possible that index rebuild is the ...
0
votes
1answer
3k views

What's a good workbench tool for sqlite similar to MySQLWorkbench for MySQL? [closed]

What's a good workbench tool for sqlite similar to MySQLWorkbench for MySQL? I'm used to MySQLWorkbench for working with MySQL databases. Now I have some sqlite databases to work with and would ...