2. SQL : Queries, Constraints and Triggers The section contains questions and answers on different set of SQL basics, set and null value operations, modifications, views and transactions, different types of integrity constraints, joins, nested subqueries and aggregate functions, schemas and data type...
Non-relational DBMS or NoSQL DBMS: NoSQL DBMS support both structured and unstructured data. There is no set defined schema as compared to other data models. The key benefit of this DBMS is that users can process queries of various elements and not be limited by the structure. To qualify ...
These database monitoring tools can also help you use best practice methods to tune your databases and SQL queries to improve database performance. Why is database monitoring important? A DBMS can be used to manage employee records, track inventory, or handle other business tasks and allow for...
Once a transaction is designated as read-only, all queries within that transaction can see only changes committed prior to that transaction’s start. Hence, read-only transactions permit you to issue two or more queries against tables that may be undergoing concurrent inserts or updates, and yet...
DBMSs typically support queries on system tables that can list all database objects with their corresponding names and types, effectively representing the entire schema. However, collecting the entire schema is excessive for describing SQL statements. While databases can contain hundreds of objects such...
All in all, serializability is a property of a system that describes how different processes operate on shared data. In a database management system, this can be accomplished by locking data so that no other process can access it while it is being read or written. Serializability guarantees th...
Explore the types of integrity constraints in DBMS. Learn their benefit, challenges, and best practices to manage constraints effectively.
ER Modelinghelps you to analyze data requirements systematically to produce a well-designed database. So, it is considered a best practice to complete ER modeling before implementing your database. History of ER models ER diagrams are visual tools that are helpful to represent the ER model. Pete...
DBMS Tutorial. DBMS is Database Management system. Lets learn about DBMS, its features, SQL queries, ER diagrams, concept of Normalisation etc, in our simple DBMS Tutorial for beginners.
A method for supporting semantic matching queries in a database management system (DBMS) by extracting and storing the transitive/subsumption relationships from a given ontology dat