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Continue reading →: Why Can’t You Connect to PostgreSQL?
By default, a newly installed PostgreSQL server accepts connections only from the local machine. To allow a remote client to connect, configure both the network listener and host-based authentication: Configure PostgreSQL to listen for remote connections. Add a pg_hba.conf rule that permits the remote client to authenticate. Configure PostgreSQL to Listen for…
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Continue reading →: Understanding MySQL LTS and Innovation Releases
Choosing a MySQL version is no longer a simple matter of installing the latest release. MySQL now offers two distinct paths: the stability and predictable maintenance of Long-Term Support (LTS), or rapid access to new capabilities through Innovation releases. This article explains how the two tracks differ, how their version…
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Continue reading →: Installing MySQL 26.7 on Red Hat Enterprise Linux 9
This hands-on installation installs MySQL Community Server from the RPM bundle, configures a custom data directory, preserves SELinux protection, initializes the server, and explains how to set the initial administrative password.
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Continue reading →: Upgrading from Oracle 19c OCP to 26ai OCP Requires Only 1Z0-183, and It Is Not Difficult
Under Oracle’s certification upgrade policy, professionals who hold the Oracle Database 19c OCP certification can earn the Oracle AI Database 26ai OCP certification by passing a single upgrade exam: 1Z0-183: Oracle AI Database Administration Professional I took this exam in March this year and found it reasonably straightforward. I scored 80 and…
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Continue reading →: Why Move More Work Into the Database When the Database CPU Is Already Saturated?
The database CPU is already running at 100% utilization. You might expect adding more work to the database to make the system slower. Yet, as this example shows, the system can become faster. Let’s look at a demonstration. 1. SQL Driven by Java: When Database CPU Becomes the Bottleneck Let’s…
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Continue reading →: “Assessing Overall I/O Latency with Little’s Law” from My Book: Oracle Database PerformanceTuning with AWR, ASH, and ADDM
To give readers a taste of my book, Oracle Database Performance Tuning with AWR, ASH, and ADDM, I as sharing the section “Assessing Overall I/O Latency with Little’s Law” below. Little’s Law is a fundamental relationship in queueing theory: In this formula, L represents the average number of requests in the system, λ represents…
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Continue reading →: Table of Contents–Preview My Book: Oracle Database Performance Tuning with AWR, ASH, and ADDM
I am delighted to share that my new Oracle book, Oracle Database Performance Tuning with AWR, ASH and ADDM, will be published by Apress. For readers interested in the book, I will share a series of previews here. This second post covers the section “Table of Contents“ Table of Contents…
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Continue reading →: How This Book Is Structured–Preview My Book: Oracle Database Performance Tuning with AWR, ASH, and ADDM
I am delighted to share that my new Oracle book, Oracle Database Performance Tuning with AWR, ASH and ADDM, will be published by Apress.For readers interested in the book, I will share a series of previews here. This second post covers the section “How This Book Is Structured.” How This…
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Continue reading →: Why I Write This Book–Preview My Book: Oracle Database Performance Tuning with AWR, ASH and ADDM
I am delighted to share that my new Oracle book, Oracle Database Performance Tuning with AWR, ASH and ADDM, will be published by Apress. For readers interested in the book, I will share a series of previews here. This first post covers the section “Why I Write This Book.” Why…
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Continue reading →: The “Poor Man’s” Oracle 26ai RAC on Proxmox
In production, building an Oracle RAC meant investing in an expensive Fibre Channel or iSCSI SAN (Storage Area Network) with dedicated physical hardware—costing thousands of dollars. For years, the “poor man’s” RAC was to use VMware with the multi-writer flag, Since VMware vSphere/ESXi is no longer truly free (the free…
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I’m Yuan
Welcome to the blog of a database performance maven. Feel free to contact me to share and discuss database knowledge.
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