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Technical Articles

Database

What are the different transaction isolation levels in SQL (READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, SERIALIZABLE)?

The article discusses SQL transaction isolation levels: READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, and SERIALIZABLE. It examines their impact on data consistency and performance, noting that higher isolation ensures greater consistency but ma

Mar 13, 2025 pm 01:56 PM

What are the ACID properties of transactions in SQL?

The article discusses the ACID properties (Atomicity, Consistency, Isolation, Durability) in SQL transactions, crucial for maintaining data integrity and reliability.

Mar 13, 2025 pm 01:54 PM

How do I use the GROUP BY clause in SQL to group data?

The article explains the use of the GROUP BY clause in SQL for grouping data, often with aggregate functions like COUNT, SUM, AVG, MIN, and MAX. It can be used with multiple columns and in conjunction with the HAVING clause to filter grouped results.

Mar 13, 2025 pm 01:51 PM

How do I use aggregate functions in SQL to summarize data (SUM, AVG, COUNT, MIN, MAX)?

The article explains how to use SQL aggregate functions (SUM, AVG, COUNT, MIN, MAX) to summarize data, detailing their uses and differences, and how to combine them in queries.Character count: 159

Mar 13, 2025 pm 01:50 PM

What are the different components of a Redis Cluster (nodes, slots, hash tags)?

Redis Cluster provides high availability and scalability via nodes, slots, and hash tags. Nodes manage data, slots distribute it, and hash tags control key assignments.(159 characters)

Mar 13, 2025 pm 01:31 PM

How do I monitor Oracle Database performance using Enterprise Manager (OEM)?

The article details how to monitor Oracle Database performance using Oracle Enterprise Manager (OEM), focusing on accessing OEM, using performance tools, key metrics, setting alerts, and tracking historical data.Word count: 159

Mar 13, 2025 pm 01:28 PM

How do I clone an Oracle Database?

The article discusses cloning an Oracle Database for testing, development, or disaster recovery, detailing steps and prerequisites. It covers using RMAN, Oracle Data Pump, and OEM for cloning, and highlights risks like data inconsistency and security

Mar 13, 2025 pm 01:26 PM

How do I configure auditing in Oracle Database to track user activity?

Oracle Database auditing tracks user activities for security and compliance. The article discusses enabling auditing, setting audit trail destinations, defining audit conditions, and managing audit logs.

Mar 13, 2025 pm 01:20 PM

How do I use Oracle Data Masking and Subsetting to protect sensitive data?

This article details Oracle Data Masking and Subsetting (DMS), a solution for protecting sensitive data. It covers identifying sensitive data, defining masking rules (shuffling, substitution, randomization), setting up jobs, monitoring, and deployme

Mar 13, 2025 pm 01:19 PM

How do I implement security policies in Oracle Database using Virtual Private Database (VPD)?

This article details implementing Oracle database security policies using Virtual Private Databases (VPD). It explains creating and managing VPD policies via functions that filter data based on user context, highlighting best practices like least p

Mar 13, 2025 pm 01:18 PM

How do I use dynamic SQL in PL/SQL?

This article explains Dynamic SQL in PL/SQL, focusing on its uses, security risks (SQL injection), and performance optimization. It details mitigation strategies like bind variables and input validation, advocating for best practices to ensure secur

Mar 13, 2025 pm 01:17 PM

How do I use cursors in PL/SQL to process multiple rows of data?

This article explains PL/SQL cursors for row-by-row data processing. It details cursor declaration, opening, fetching, and closing, comparing implicit, explicit, and ref cursors. Techniques for efficient large dataset handling and using FOR loops

Mar 13, 2025 pm 01:16 PM

How do I use collections in PL/SQL (arrays, records, tables)?

This article explores PL/SQL collections (records, nested tables, associative arrays), comparing their performance and demonstrating efficient usage. It emphasizes choosing the right collection type for optimal performance based on data structure an

Mar 13, 2025 pm 01:15 PM

How do I handle exceptions in PL/SQL?

This article details PL/SQL exception handling. It covers built-in exceptions (NO_DATA_FOUND, ZERO_DIVIDE, etc.), the EXCEPTION block structure, best practices for using WHEN OTHERS, and techniques for improving error logging and handling, includi

Mar 13, 2025 pm 01:14 PM