A schema of a database system is its structure described in a formal language supported by the database management system (DBMS) and refers to the organization of data to create a blueprint of how a database will be constructed (divided into database tables).

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153 views

How can I integrate a new system to a design scheme I previously created?

This is a follow-up to a question I wrote a while ago, for reference, you can look it up here. I've developed a curriculum based database scheme that looks like this(Thanks Joel Brown) Now that a ...
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2answers
539 views

Oracle schema import is not importing all the tables present in the schema dump file

I have exported an existing oracle schema from another machine and then imported it in my local machine. Import was successful, but some tables which are present in the export dump file are not ...
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1answer
204 views

Designing Simple Schema for Disaggregation of Demand Forecast

I am doing a simple database design task as a training exercise where I have to come up with a basic schema design for the following case: I have a parent-child hierarchy of products (example, Raw ...
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1answer
104 views

Searching 500 million records of binary data

I will inserting into a database the signatures of 500,000,000 pictures. The signatures will be generated using libpuzzle. Each signature is 338 bytes. (so 160 GB) plus a table for searching (read ...
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1answer
98 views

To normalize or not to normalizde? (10 fields)

I'm helping someone to design a database and for a specific case I'm not sure. I have 10 fields - this will never change - that will always be filled and used in every query that could be coming up. ...
2
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1answer
162 views

Best embed/reference/field strategy for many inserts (mongo)

I'm building a gaming backend with Mongo, and have some issues on how to best design the schema to maximize performance and database size. My models: User Match -ReferenceMany (User) ...
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1answer
42 views

Is there any way MySQL can list relationship cardinality between two entities?

I am working on the project where I have to analyse the MySQL schema. As a part of schema information, I want to list down relationship cardinality between different relations. Does MySQL stores ...
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1answer
54 views

MySQL 5.5 to 5.6 Upgrade. Will data remain the same?

We are considering to upgrade to MySQL 5.6 this summer. I would like to know if our data will be changed in any way once we perform the upgrade? I've been reading and I found that mysql_upgrade ...
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1answer
61 views

Does this medical database look correct?

I'm pretty new to databases and I'm trying to create some schemas. I've been working away at this one for a while, but I can't help feeling that it doesn't look right. Essentially I have the ...
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1answer
47 views

Designing database with Category and Tags for Posts - Seeking for guidance/advice

I'm not really a database novice but I'm not an expert either. Problem: I'm having this difficulty on designing my Post, Category and Tags relationship. I've read Normalization many times but could ...
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1answer
77 views

Should I save “document ID” as a String or Number in MongoDB

So I'm importing about a 100,000 documents into mondoDB. MongoDB already generates an Object hash but the data has a documentID that was used to identify records in the previous database. The IDs ...
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1answer
18 views

Delete all types created by a user

In Oracle 10g, how do I delete all the types owned by a specific user? This is the view that gives me the types I want to drop:SELECT type_name FROM user_types;
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1answer
45 views

How can I Automate MongoDB schema design from existing MySQL Database and Logs?

I am working on the project which will automatically generate sample MongoDB schema analyzing existing MySQL database and logs. I am looking for help regarding the below questions. Please, share your ...
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1answer
45 views

MySQL DB structure with Main category and several nested sub categories

I am looking to create a set of fields on my webpage identical to what eBay uses on their category selection page when you are selling something. For my purposes I am doing motorcycles, power sports, ...
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1answer
45 views

Schema for lists of relationship differences

Say there is a data model that allows for relationships to be defined either explicitly or as a list of records added or removed relative to some existing item: Item <–> *Properties and Item ...
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1answer
74 views

Relation between multiple hierarchical taxonomies linked to a single entity

I am working on an online test application which supports multiple choice questions. I have created schema for taxonomy (classification) system to be used with questions. taxonomy(id, name, slug, ...
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1answer
59 views

Do I need to explicitly grant permissions for a login under the sysadmin role for it to access a custom schema?

So I have a login that has sysadmin rights on the db server. However, it's not able to access database objects under a custom schema that was created (eg. it cannot select from tables with ...
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1answer
350 views

What's a good way to model user authorization to hierarchical data?

I'm wanting to implement something that's basically an ACL in SQL Server (2008, we'll be moving to 2012). We're working with farm production information. We will have users who need to be authorized ...
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0answers
166 views

Oracle sqldeveloper Database Diff - not seeing indexes/sequences

I am using Oracle SQL Developer's database diff tool to compare schemas. (SQL developer version : 3.2.09) It works great on some environments, but in one, I can only see differences in tables - the ...
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0answers
31 views

mongodb Date strings and other issues

I asked a question on Stackoverflow, and was told that my schema was way off. I am using mongodb to store whether or not a log file exists. The log file contains info for an hour. I'm not actually ...
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0answers
46 views

Do supertables produce bottlenecks?

There are several alternatives to using polymorphic associations and one of them is to use the so-called "concrete supertable". From my point of view, this is the neatest solution and is pretty easy ...
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0answers
19 views

Lossy Decomposition meaning

Suppose I have a relation R=(A,B,C,D) and I decompose it into: R1=(A,B,C) R2=(A,D) then if it is said that the decomposition is lossy,then what is the meaning of that statement?I have an ...
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19 views

MySQL Workbench Forward Engineer from only the current diagram

I want to create a test database from a huge schema in MySQL, but when I try to do Forward Engineer from a Diagram with about 6 tables, it try to create all the tables, views and routines groups that ...
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44 views

MySQL Space efficient way of storing indexed key-value pairs associated with table

We're storing transactions in an accounting system using two tables, one contains the general description of the particular transaction (the other contains the entries, one for each account - which ...
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39 views

Schema for yearly data models

I am developing a school management system. Most data will not be reused after the end of the school year. I am contemplating using schemas to separate data in various school years, however I am ...
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62 views

Cloning Postgres schema/tables across multiple servers

I'm working on a project that has databases across multiple servers, with one server for each business client. The project has some identical 'base' tables that are present in all the databases (for ...
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99 views

Are duplicates ever acceptable in a database

A warehouse system I am working on allows inwards consignments [type = 0] and outwards consignments [type = 1]. The user selects multiple products for each consignment and then multiple warehouse ...
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415 views

which role-permission database design?

I want to manage roles and permissions. Most of designs on web look like this tables: Users Roles UserRoles Permissions RolePermissions Here, what is permissions? I am thinking for such a design ...
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342 views

How to represent class table inheritance (current DBMS-specific way please)?

I want to implement class either-or table inheritance (Account, CatAccountDetails, DogAccountDetails) in SQL Server. I found a recommendation for MySQL here (How do I map an IS-A relationship into a ...
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205 views

Powershell to dump database schema to text file

I want to be able to dump a database schema to a sql text file using Powershell. I want this because our DBAs want to be able to do a diff on the file that is committed to SVN. They won't execute it ...
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42 views

Database Design for NoSQL Fantasy Baseball League

I am trying to create a proper schema to place scraped data into, using a MongoDB database. Currently it looks like Team { id : id, name : String, teamLink : String, username : ...
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26 views

Need help with data model

Schema does not list all fields, but only the relevant ones User adds credits/funds to his account using paypal or Internet Banking (which has to be verified manually, and approved, so the 'status' ...
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28 views

Multi language where this feature never existed

I need to implement multi language system in an existing system that was not developed for this. The number of entries in the tables that will hold data that has to be translated will not exceed 5 ...
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0answers
84 views

Review a database schema for a design approval system

I'm working on my first web application that will utilize a database. The basis for the application is a design approval system. I work for a company which mainly produces print and online marketing ...
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43 views

Mysql profiler different duration information_schema.profiling

Hi! I have a problem and no idea how to resolve it. I'm trying to use mysql profiler. I'm using the command: set profiling=1; to turn it on. Later, i execute my query which is correlated ...
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30 views

Unique database presentation ideas

I have completed the first phase of a fairly large database schema design. I built the ER-diagram in DIA. I have to present the schema to an audience of fellow software engineers. Any thoughts on ...
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22 views

How should I restructure a table that contains multiple columns that contain similar, but not same data?

I currently inherited an InnoDB table that describes a product. In the table there are a few columns that describe the maximum height at which the product may be mounted. These are the columns: ...
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32 views

Schema & Database Role Permissions Issue

I have a Schema and a Database Role. An Active Directory member is added to the Database Role. I grant the Role Select permission on the Schema. Control permission is denied on this Schema. However, ...
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11 views

Reducing schema to shrink real-world data to a functional subset

I work with two editions of a shipping product; call them "A" and "B". Both use similar a database schema, but edition "B" has a strict super-set of the schema (and features) used for edition "A". ...
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29 views

Should I be worried about duplicate entries in the Oracle all_dependencies table?

I think there are some problems with object relational functionality in Oracle 11g (and some earlier versions). We have a purely relational mapping ready as it is easier to handle, but need to support ...
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51 views

Save output of MYSQL Schema Inspector

MySQL Workbench 6 has a Schema Inspector that shows all the tables in a DB and useful statistics such as number of rows and average row lengths. How can I get that in a form that I can email someone ...
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14 views

Services in a Catalog with Year/Week/Day period

I want to create a database structure for the Services in a Catalog with Offres for one or more services. Each Offre is available for one Year period ( example : 01 Janvier – 31 Mai ) , for a Week ...
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109 views

please help me connect workbench on 5 system having one server

We have computing software which has one server for 5 computers. I can work on server in MySQL workbench but when i try to work on second computer i get error failed to create ipc port : access is ...
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201 views

XML Data convert to SQL database,

I have an XML feed that i need to parse daily, i want to store all of the data from the XML feed in a SQL table so then that data can be queried and manipulated by my clients. I can currently parse ...
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67 views

In regards to GS1 barcode - what size DB field are used?

In regards to GS1 barcode - what size DB field is used or is the entire GS1 typically not stored in database, but rather processed in the application layer and stored in the database as a collection ...
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44 views

Examples of a database with no consistency measures that ensures consistency through schema alone

To clarify, the database can be any type RDBMS, NoSQL/BigTable. However, it must not employ any usual consistency measures such as locks, or synchronization, but the inconsistency-invincibility must ...
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103 views

Database (open source) for complex queries (for analytics) like these:

In an app, I'll be storing information about events, specifically, session_id url time type data: foo: bar bar: foo The data will basically be a hashmap (need to support arbitrary types / names ...
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148 views

Schema for Google Docs-like sharing

Am trying to design a nicely normalized schema for sharing entities in a database, with good referential integrity. It should work similarly to Google Docs sharing. Here is what I have so far: ...
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IBM DB2 9.7 determining default tablespace

I have a DB2 9.7 database. I have defined any specific tablespace, so all tables go to USERSPACE1. Now I have created two new tablespaces and assign two tables to each of the two new tablespaces with ...