Databases@Powered by Passion
PostgreSQL allows most DDL commands to be rolled back within a transaction block, unlike in many commercial database systems where DDL commands automatically commit the current transaction. With exceptions like DROP DATABASE and CREATE/DROP TABLESPACE, PostgreSQL ensures that all DDL operations are transactional, allowing for rollback as needed.
This blog introduces the concept of holistic patching for Oracle Enterprise Manager, which simplifies and consolidates patch management for its various components. The method aims to reduce complexity and downtime by bundling updates into a single package, allowing organizations to focus on core activities. The process involves updating the OMSPatcher and executing a simple command for patching, significantly streamlining the patching process for Enterprise Manager.
The performance fluctuations in a query on production database were attributed to different NLS_SORT settings affecting SQL plan selection. The query showed varying performance with differing plan_hash_values despite a simple structure. Investigations revealed the impact of NLS settings on plan generation. Mimicking the behavior with setting NLS_SORT value in session confirmed the issue, leading to the creation of a functional index that resolved the problem, as evidenced by the subsequent execution plan.
The post details the installation and configuration of MariaDB and MaxScale with the NoSQL Protocol Module on Oracle Linux 8. The process involves downloading and installing MariaDB 11.4.2, configuring the MariaDB repositories for YUM, installing dependencies, setting up MaxScale as a database proxy, and establishing a NoSQL Listener. After verifying the services, the user prepares to interact with the NoSQL Protocol Module for MariaDB.
The One Billion Row Challenge (1BRC) presented by Gunnar Morling invited Java developers to aggregate and summarize a large volume of data. At the PGDay Ankara Conference, Murat Tuncer showcased FerretDB as a seamless alternative to MongoDB, aligning with the trend of “Just use Postgres for everything.” The Oracle MongoDB API and FerretDB allow developers to use MongoDB syntax with relational database management systems. A performance comparison revealed that while both alternatives are capable, they were slightly less efficient than vanilla MongoDB.
The installation of Oracle Database 23ai involves downloading the setup file, modifying configuration parameters, creating directories for ORDS, installing and configuring ORDS, creating a database user for MongoDB API, and connecting to the database using mongosh. Various commands are used for these tasks, including downloading and unzipping ORDS, modifying configuration files, and connecting to the database with specified credentials and settings. The process also includes setting custom ports for ORDS and the MongoDB API.
Osman’s DBlog 