Database management systems (DBMSs) are specially designed applications that interact with the user, other applications, and the database itself to capture and analyze data.

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Type of relational/object-oriented database with improved joins for object graphs?

I would like to know if there is a specific name or term for the kind of database described below: I notice one of the biggest problems when working with relational databases and object trees/graphs ...
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1answer
35 views

Copying CSV file to temp table with dynamic number of columns?

I am wondering if there is a way to copy a csv file into a temp table where the number of columns is unknown in the csv file. The DB software I'm using is PgAdmin III. I figured out that if I do know ...
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What is wrong with my ERD?

I am trying to create a reservation/booking ERD. Is their anything wrong with my current ERD? It must show a supertype and subtype, and it must identify attributes for regular, weak, and associative ...
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23 views

Method to Obtain LossLess Join BCNF Decomposition

I have been told a way to obtain loss less join BCNF but I don't know how to calculate candidate keys(also called super key in some cases) and trivial Dependency. I have been given a relation R = ...
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2answers
87 views

Oracle SQL Creating Copy of Table Using DBMS_metadata

so I am trying to create a copy of a table using dbms_metadata. I know you can get the DDL of a table by executing DBMS_METADATA.get_DDL('Table','TABLENAME') so my question now is how can I use this ...
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1answer
61 views

Clarification for database creation and relations

I've trying to make database with few tables and relations between them. As I'm not very good in databases at all I need some clarifications. The idea is to connect table with table_1, table_2 and ...
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2k views

Performance Benchmark - MySQL vs PostgreSQL [closed]

this is my first question here in DBA. I wish to do a performance comparison between MySQL and PostgreSQL using same database on the basis of total time taken to parse + execute + send result back ...
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1answer
125 views

Decompose Relation R(ABCDE) in 2nf and 3nf

Given relation R(ABCDE) with functional dependencies A->C B->D AB->E Given: AB is the primary key. I know that this relation is in 1NF because of partial dependencies A->C and B->D Now how I ...
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3answers
400 views

Does 3NF require 2NF?

I am a bit confused with the definition of 3NF. According to Wikipedia: The third normal form (3NF) is a normal form used in database normalization. 3NF was originally defined by E.F. Codd in ...
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1answer
900 views

What is the difference between covering and overlapping constraints use in DBMS?

What is the difference between covering and overlapping constraints use in DBMS?
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140 views

How to drop table with all reference to this table

I want to drop a table, and this table has be many table's foreign key. So I want to drop all those reference (just refernece, not other table) within the drop table process. Is there any simple ...
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3answers
425 views

What is the best way to store a lot of user-encrypted data?

I'm about to develop an application that will mainly store user-encrypted data. Each piece of data being encrypted thanks to an AES key, itself encrypted with the public RSA key of each granted user. ...
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351 views

Independent pairs of RAID 1 is superior to RAID 10 [closed]

I am rather new to databases. I was reading up on RAID Storage and it seems that the consensus is that RAID 10 is RAID 10 is best is terms of performance and redundancy However at the end ...
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1answer
81 views

Performing projection first and then selection?

Consider a simple query: Select username,usertype from Table1 Where usertype='Manager' Most probably the DBMS will be performing selection first, and then projection i.e. first pulling out rows ...
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81 views

What does acid stand for in Database Management System? [closed]

I want to know about "acid" property in database management system. Can anyone explain me in brief?
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1answer
38 views

Access: search for more than one parameter?

I need to perform several queries, looking for more than one parameter. for example: in my field "lenght" I want to extract values matching both 4.6 and 4.7. then, next time I need 5.8 and 5.9, and ...
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2answers
717 views

FileWatcher Troubleshooting Options

I have setup a Credential/Procedure/Program/File Watcher/Job to monitor a folder for new files, but it is not working. I am trying to figure out what I can check to troubleshoot why this isn't ...