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✅ 15 PySpark Interview Q&As for Data Engineers: pythonCopyEditfrom pyspark.sql.functions import udffrom pyspark.sql.types import StringType def convert_upper(text):return text.upper() upper_udf = udf(convert_upper, StringType())df.withColumn(“upper_name”, upper_udf(df[“name”]))

🔹 Looking to replicate your on-prem Oracle database to Google Cloud with real-time changes? Oracle GoldenGate (OGG) provides a seamless solution for heterogeneous replication with minimal latency. 👉 In this post, I’ll walk you through a step-by-step process to configure Oracle GoldenGate replication from an On-Premises Oracle database to Google Cloud (Cloud SQL / Bare […]

Essential PostgreSQL Queries Every Data Engineer Should Know 🚀 As a Data Engineer, mastering PostgreSQL queries can help you optimize database performance and troubleshoot issues efficiently. Here are some essential queries to keep in your toolkit! 🛠️ 1️⃣ Check Tablespace Size Monitor the disk space used by your tablespaces: SELECT spcname AS tablespace, pg_size_pretty(pg_tablespace_size(spcname))FROM pg_tablespace; […]

🚀 Mastering Table Partitioning in PostgreSQL 🚀 Table partitioning is an advanced database technique that helps you manage large datasets efficiently by dividing a table into smaller, more manageable pieces. PostgreSQL offers a powerful way to partition tables based on specific criteria, making querying and data management more scalable. 📊 How Table Partitioning Works1️⃣ Create […]

🔹 Seamlessly Replicate Oracle On-Prem to AWS RDS with GoldenGate 🔹 As enterprises move towards cloud adoption, ensuring high availability, disaster recovery, and real-time data synchronization is critical. Oracle GoldenGate (OGG) provides a robust solution to replicate data from an on-premises Oracle database to AWS RDS for Oracle with minimal downtime. Here’s a step-by-step guide […]

CRUD operations (Create, Read, Update, Delete) are fundamental when working with PostgreSQL databases. Whether you’re a beginner or an expert, understanding these operations is crucial. Create Table Use the CREATE TABLE statement to define a new table: CREATE TABLE employees (id SERIAL PRIMARY KEY,name VARCHAR(100) NOT NULL,salary NUMERIC(10,2),department VARCHAR(50)); PostgreSQL Data Types PostgreSQL provides a […]

GoldenGate & Data Guard Integration with Commands in Oracle 19c RAC:1️⃣ GoldenGate Installation on RAC Nodes Install Oracle GoldenGate on all RAC nodes where replication is needed. Ensure you have the correct Oracle GoldenGate version compatible with Oracle 19c.Command to Install GoldenGate: ./runInstaller -jreLoc /path_to_java_home -DORACLE_HOME=/path_to_oracle_home -DORACLE_BASE=/path_to_oracle_base 2️⃣ Configuring Oracle GoldenGate for Oracle 19c RACGoldenGate […]

Essential PostgreSQL Queries Everyone Should Know! 🚀PostgreSQL is a powerful open-source RDBMS, but managing and optimizing it requires the right queries. Here’s a collection of must-know PostgreSQL queries to monitor performance, troubleshoot locks, manage space, and optimize indexing. 📌 1. Check Tablespace Size SELECT pg_size_pretty(pg_tablespace_size(‘pg_default’));🔹 Why? Helps track tablespace utilization to prevent storage issues. 📌 […]

Administering Oracle RAC 19c with SRVCTL & CRSCTL – Essential Commands 🚀Oracle Real Application Clusters (RAC) ensures high availability, scalability, and reliability for mission-critical databases. But how do we manage and troubleshoot RAC environments efficiently? Enter SRVCTL & CRSCTL – two essential tools for managing Oracle RAC components. Let’s dive into their real-world use cases […]

PostgreSQL Cluster Management: Essential Commands for DBAsManaging a PostgreSQL cluster effectively is crucial for database availability, performance, and maintenance. Whether you’re setting up a new cluster or managing an existing one, these core commands will help you with initialization, starting, stopping, restarting, and reloading configurations in a PostgreSQL database. 🔹 Step 1: Initialize a New […]