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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How to count all relationships in a database?

I am developing a web application, which stores data in a Microsoft SQL Server database. My project manager has to deliver a report to non-tecnhical higher-ups, and thinks that it will read impressive ...
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76 views

Design for table with multiple links to other table

I am designing a database to keep track of our network equipment. My db has 2 tables: sites & circuits (circuit = cable) & (site = property location) Each circuit runs between two sites, so ...
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ER Schema “Optimisation”

I am trying to make an ER Schema for a person. The person will have Current Address and Permanent Address. So far I have it so that both Current and Permanent Address are Composite Attributes and they ...
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393 views

Database schema design help needed

I am developing a PHP application expecting millions of records both parent and children. My goal is to design an optimized database design to achieve high speed and performance. This application ...
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3k views

Billing Module (Fee) for School Management System

I am working on a School Management software which includes module for billing of students i.e, fee collection from students. The fee is collected on monthly basis (12 times a year) and the total ...
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801 views

Relationships in a school database

I am designing database for a school app. Student is the main entity in the database. Student has relation with Parent & Guardian. I am confused as where to store references. As will student ...
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43 views

Linking table or column key

Simple structure: have a table PAGES - which stores information about specific landing pages working on developing a GROUPing concept for the pages, where we are saying that a page may or may not ...
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49 views

Compare order of columns between two databases

I have two postgres databases which should have an equal db-schema, but have not. I want to see the difference in the column order. Columns of table1 in Dev: id, foo, bar Columns of table1 in Prod:...
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93 views

Single-Table vs. Multi-Table design

I'm trying to come up with a database schema which is going to be used for a social network similar to that of Facebook. Now for posts I have two schemas in mind which are as follows: Single-Table ...
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42 views

Default schema is ignored on SELECT

According to my understanding, a default schema should apply when issuing SQL statements on tables using unqualified table names. My problem is that the following statement fails, because the table ...
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54 views

Apply operation on all schemas

I have an Oracle instance, with several schemas (all starting with the same prefix). PATT_A PATT_B PATT_C ... All of them have the same table, and I'd like to update all of them in one shot (with ...
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206 views

Best Approach to Migrating Oracle to MySQL - Run on EC2 in AWS

I'm trying to migrate an Oracle schema as well as all of the data within the DB to a MySQL database. I want to then make an EC2 app on AWS to kick off whatever I've written for this. Are there any ...
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870 views

Is an ER diagram an example of a conceptual, logical or physical schema?

I have been reading databases, and I clearly understand the difference between a conceptual, logical and physical schema. An ER diagram is an example of which of these schema's?
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Is it a good idea to add a reserved field to a large MySQL table?

As you may know adding a new column to a MySQL table with millions of records is hard and in some cases impossible. Is it a good idea to add a text column to each table (say, meta) to save some ...
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392 views

Is there a way to replicate certain part of collection in Mongodb

Is there away to stream certain part of collection in MongoDB or TokuMX from master server to another server? I need to duplicate only certain collection Or if it isn't possible, are there any other ...
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1answer
32 views

Rescue truncated data from incorrect column type

I have mistakenly inserted a variable 18-20 digit variable into an unsigned INT() column. The data has been truncated to the max 32bit length so all my data is displayed as "4294967295" Is there ...
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1answer
28 views

Ensuring that 1 row has 5 specific records referencing it

Context: a TEST has many CASEs. Typical. However, the catch is that a TEST instance must have exactly 5 instances of CASE (1 to 5). I could do something like this: create table TEST ( ID ...
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1answer
166 views

Need some expert eyes to look at my schema

I am trying to make an online site for local movies. Will be written in PHP and will be using MySQL as the database. What I want is to create a mini IMDB type site, with movies, people(casts/crew), ...
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226 views

Unable to check is schema is present first

I've created a SQL script that will release a process to numerous SQL Server instances so I want to check if a paticular schema is present before creating the schema. I'm using the below and it ...
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2k views

Multi-Tenant (SaaS) Database Schema with Sharing

Guys I just need your opinion which is the best approach to design a schema of a database for a SaaS application. I want it all on a single database, At first I think I can simply put a context_id ...
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103 views

is there a recommended way to update many postgres schemes

I have a database in postgres which has 15 schemes, the schemes are identical with the same tables, views and functions. the system uses one scheme at a time, as if they were separate databases. So ...
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2k views

Granting permissions only on a set list of objects

I have a SQL Server 2005 database with a large number of tables in the dbo schema. I now created a new schema (call it myschema) that only has three table-valued functions and two stored procedures in ...
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2answers
6k views

SQL Server Database Diagram in SQL Management Studio creating multiple schemas

I'm using a multiple schema approach (Multi-Tenant arhitecture) in the same DB and it's working great. I can use EF bounded contexts and split domains appropriately. According to MSDN, multi-...
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37 views

Oracle 12c : Unable to install sample schemata on Windows 10

I've gone through lots of trial and errors in installing the sample schemata for Oracle 12c and still can't get it right. I have a pluggable database named PDB01. I also have an instantclient ...
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75 views

Products with different prices in an order

I have a "classic" database schema for order and products: Orders ------ id etc. Products -------- id name etc. Order Products --> Pivot table -------------- id --> some people don't like ...
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51 views

Problems with queries [closed]

I have problems with queries in MySQL. Problem 1: Query: SELECT * FROM information_schema.TABLES WHERE TABLE_SCHEMA="mysql" and TABLE_NAME="servers" MySQL says: #1054 - Unknown column 'mysql' ...
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59 views

Maximum number of TEXT/BLOB columns per table/performance of table with many of them?

I've created a system that generically imports CSVs into a database table with metadata columns for keeping track of when a CSV record has been changed, and it allows filtering on CSV columns instead ...
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58 views

Migrate SQL server data to new schema

I have a database that was originally created by a couple of people for a small business unit (about 8 staff and 10 customers) in MS Access. The original 'developer' was a non-geek who had been sent ...
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41 views

OLEDB provider for linked server reported change of schema version error

I am trying to run a report but its giving this message: An error has occurred during report processing. (rsProcessingAborted) Query execution failed for dataset 'ParamYear'. (rsErrorExecutingCommand)...
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26 views

Good reason to convert LONGTEXT column to smaller width if field is smaller?

We have a database that uses a LONGTEXT type for a column that does not need that much space. The maximum row size currently has about 6500 characters and that's with a few million inserts so it's ...
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1answer
105 views

ORA-00942: table or view does not exist- Can it be solved by granting privileges to user?

I am creating a Java application that connects to an Oracle Database. In the application I connect to the DB as User A, which works as intended. I then try to access tables in Schema 1 and Schema 2....
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56 views

What is the name of the default schema in Oracle?

When you create an object in Oracle, and do not specify a schema (object prefix), is there a name for that default schema? I see in Oracle SQL Developer, that a newly created object shows up in the ...
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36 views

MongoDB storage of multi-dimensional arrays

Using MongoDB 3.0.7 as the primary datastore. I connect to it using ReactiveMongo 0.11 on a JVM-based language. My question is: how well does Mongo store multi-dimensional arrays? For image analysis, ...
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152 views

How would you design a table for approval system between User and Sports Club

I am currently learning database modelling and struggling to model the following requirement. I have a user and sports_club table. User can only join a sports_club if three existing users of the club ...
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53 views

How do I host and separate multiple projects on one Oracle Database?

From Difference between database vs user vs schema I'm trying to understand the concepts of the schema, user and database. My current understanding is you cannot create a schema separately. You can ...
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123 views

Documenting SQL Server Database [duplicate]

I wrote the following (Quick and Dirty) script to document a database schema: Note - The relationships part came from another guys site (I just can't remember where). Does anyone know how to ...
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2answers
949 views

Export pump all schemas except Sytem related schemas

I have around 111 schemas in one database instance and have to export all the schemas except the system related schemas to a new instance. Is there any way as to exclude system related schemas while ...
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1answer
75 views

Copying MySQL schema, some tables not getting recognized!

From the 'data' folder of my colleague I copied the entire 'MyDatabase' folder and pasted that in my own 'data' folder.Now, some tables are getting recognized while others are not.**All the tables are ...
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68 views

Can SQL Server 2014 schema be defined using ODBC?

I am trying to use the ODBC driver for SQL Server 2014 to export data from an Autodesk Revit 2015 model to a database. However, I would like to export to a default database (e.g. db1), creating a new ...
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999 views

Installing OE (Order Entry) schema in Oracle Express

I'd like to know if it's possible to install OE (Order Entry) schema in Oracle Express. If so, how can I do that?
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1answer
31 views

Do i need “CHECK CONSTRAINT” when i am using “WITH CHECK ADD CONSTRAINT”

I am working on SQL Server 2008 R2, where I generated a schema-only database script using SQL Server Management Studio. The generated script is as follows: ALTER TABLE [dbo].[ConsoleServer] WITH ...
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94 views

Database design: handling time

I am developing a weekly timetable which ideally would allow teachers pick what subjects they teach. While most of this is fairly straightforward, from a conceptual point of view I am unsure how to ...
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120 views

Schema Design with “Seasonal” Data

I am developing a SaaS web application for School Management. What I need help is this: The whole application is purposed for the current year that the School is in. However, some data and ...
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1answer
133 views

How can I limit a user to only be able to run procs in a schema, which access another db?

In a SQL Server 2012 SP2 Standard Edition instance I have a user in database A that needs to be able to run stored procedures in schema foo within that database. They shouldn't be able to do anything ...
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63 views

Normilsation - 2NF and 3NF

I've been through several questions and youtube tutorials, i understand that 2NF is removing the partial dependencies and 3NF is the transitive ones, but i can't get my head around how the following ...
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1k views

Select rows from table where each row refers to a different schema

I have customer table in public schema. And I have a schema named after each customer. Each customer schema contains different tables like portals, plugin, ... When I want to select portals used by ...
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29 views

Can we determine FDs if we are given some tuples?

I am taking a databases course and i'm learning about functional dependencies. I have searched around and did not find any information on this. My questions is if we are given a table with some tuples,...
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2answers
1k views

In Oracle, how to get a list with the names of schemas that a user has read permission?

In Oracle, i need list which schemas a particular database user (or the current database user) has read permission. Based on this information, also need to get all the tables and views are in each ...
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1answer
65 views

Design for periodic data cuts

I've been building an application that has a 6-monthly update schedule, i.e. a cut of the data for H1 & H2 of each year. The previous version of this application implemented this by making a copy ...
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903 views

Migrating everything to do with a schema from one Oracle DB server to another

We have an old DB server, running Oracle 11g on Solaris. We also have a new DB server, also running Oracle 11g, but on RHEL. We want to move a schema to the new db - but we need everything it refers ...