Ontologies and DB Schema: What's the Difference? What is the difference between an ontology and a database schema"? Since the early days of the now maturing ontology field, this has been a persistent question that has never been adequately answered. We define each concept for a high level comparison and then ask the following questions about each concept: 1) What is it for? What does it look like?
How do you build one? How is it implemented and used? Where are the semantics? This gives rise to many other questions. For example: What is the role of constraints?
Schema Comparison Tool. Schema Comparison Tool allows you to compare tables, views, functions, sequences, packages, stored procedures and other database objects between two schemas/databases. It will report any discrepancies.
Is there an analogy in ontology development for the process or database schema normalization? How is change management handled? The differences between database schema and ontologies are many, varied and illuminating. Most arise from their different purposes and historical origins.
There are also striking similarities. We wondered whether database schema and ontologies were more alike than different. We reached a surprising conclusion!
Schema Comparison Tool Schema Comparison Tool. Schema Comparison Tool allows you to compare tables, views, functions, sequences, packages, stored procedures and other database objects between two schemas/databases.
Db Schema Comparison Tool Free
It will report any discrepancies between schemas such as missing or mismatching stored procedures, tables, triggers, columns, indexes and constraints. It also will detect column discrepancies such as data type, nullability and defaults. Also, comparison can be done between schemas on two different DBMS platforms such as Oracle and SQL Server. For detailed information regarding this feature, see the User Documentation.
DB Change Manager is a database change management solution that lets you quickly roll out, reconcile, track, and report on database changes. Learn more here. Free Compare database tool - DBComparer 3.0 is a professional compare database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure.
Comparison of different SQL implementations. The goal of this page — which is a work in progress — is to gather information relevant for people who are porting SQL from one product to another and/or are interested in. Adept SQL. AdeptSQL Diff was my first ever Schema comparison tool. It’s a lightning fast and intuitive tool to visually compare and synchronize two MS SQL Server databases. The program scans both databases and displays the.
Using Schema Compare in Visual Studio 2013 Topic List Expand All Topics Hide All Images Print. In this article, I will show you how to create a basic DB schema comparison tool for SQL Server 2005 and SQL Server 2008.; Author: Kanasz Robert; Updated:; Section: Database; Chapter: Database; Updated.
Currently schema comparison is supported for Oracle, SQL Server, DB2, SQLite, Postgre. SQL, HSQLDB, Vertica, My. SQL and Sybase ASE/ASA. The comparison can also be run on all supported platforms: Windows, Linux, Mac. OS and Solaris. Selecting Schemas/Databases. The first screen of the Schema Comparison Tool allows you to select the source and destination. The database/schema to be compared can either be on a live database server or.
Active Database. To compare a database or schema on a live database server, select the 'Database/Schema' tab under 'Source' or 'Destination'. The tree control on the left hand side allows you to select 'source' database/schema of the comparison and the right side lets you pick the 'destination' database/schema. Saved Snapshot. To compare a database or schema that you have earlier saved to a snapshot file, select the 'Snapshot' tab under 'Source' or 'Destination'. To open a previously saved snapshot file, click on the file folder icon and point to the snapshot file on your hard drive. If you only want to compare certain tables from the source schema/database, you can do that by unchecking 'Compare All Tables' check box and picking the individual tables for comparison. By default, all tables from the source and destination schema/database are compared. Using the same mechanism, you also need to select the view, functions and stored procedures you want to compare, by default all objects will be compared.
After selecting all the desired objects for the database comparison, click on 'Next' to proceed to the setting page. Settings. The settings panel gives more control over what attributes will be compared between the selected schmas or databases. The settings panel is divided into several main categories; Columns, Constraints, Indexes, Triggers, Stored Procedures, Functions and Views. For each category there are numerous settings you can modify to affect how the comparison is done. For example, column comparison can be modified to ignore the default values or nullability of all columns. For each column data type there are additional settings you can modify, such as precision/scale comparison for fixed point decimal values.
Notice that all settings will be persisted between DB Solo sessions, so you don't have to enter the same information every time you run the comparison. After choosing your settings for the database comparison, click on 'Next' to start the comparison process. Notice that if your database contains hundreds of objects, the database comparison process can take considerable time to complete. Viewing Results. The results panel shows the results of the database comparison in a tree format. The tree items are colored so that pinpointing differences between the compared schemas becomes trivial. By clicking an item in either tree of the database comparison tool's result window will show a detailed explanation about the selected item.
If an item is selected in both trees, the database comparison tool will show the details on the last clicked item. The 'Only show tables present on both sides' check box allows you to filter the output so that only tables present in both databases are shown in the trees. When selected, the 'Only show objects that do match' check box will filter out objects whose definitions match, i.
Generating Schema Synchronization Script. You can automatically generate a DDL script that will synchronize the differences between the two schemas you compared.
This script will contain the required SQL ALTER, DROP and CREATE statements to reconcile the differences based on the database comparison results. Notice that if you compare 2 databases between different DBMS products, such as DB2 and Sybase, the synchronization script option is not available. Saving and Loading Schema Comparison Projects. The schema comparison tool lets you save all your comparison selections to a project file. The project files can then be checked into your source control system and shared between different entities in your organization. This facilitates running comparisons on a regular basis to minimize costly mistakes.
To save your comparison settings, click on the 'Save Project' button on the last screen of the schema compare wizard. This will bring up the dialog below where you can enter the output file names that will be generated by the command line tool (see next section). Running the Schema Comparison from Command Line. After saving your schema comparison project to an XML file, you can subsequently run your comparisons from the OS command line or shell.
To invoke the comparison tool from the command line, enter the following command: command. Line - compare myproject. Notice that it's possible to use a project file that was created on a different machine, however the DB Solo installation that you invoke needs to have the same server connections configured as the DB Solo installation that created the project file.
This is because the project file does not contain all the connection information, just the name of the server connection. All errors and informational messages during the command line schema comparison are recorded in compare.