Database Administration, Database Contractor

A Complete Intro to MySQL for a DBA

04/01/2024 by Philip

MySQL stands as the cornerstone of modern database management for many database administrators (DBAs). With its robust set of features and renowned reliability, it presents a compelling choice for managing large-scale data effectively. As a DBA, whether you’re starting fresh or honing your expertise, grasping the intricacies of MySQL’s architecture and its extensive capabilities is …

How to Fix Insufficient Memory Errors in Aurora Postgres After Migration

04/01/2024 by Philip

Migrating to Aurora PostgreSQL can offer significant performance improvements, but it also introduces unique challenges, such as managing memory more effectively. Insufficient memory errors can lead to system instability and performance bottlenecks, which is why understanding how to address these errors post-migration is crucial. Aurora PostgreSQL introduces certain features aimed at proactive memory management, but …

What Causes the ‘Out of Storage’ Error in Aurora Postgres Post-Migration? Understanding Space Allocation Issues

04/01/2024 by Philip

When migrating to Amazon Aurora with PostgreSQL compatibility, encountering an ‘out of storage’ error can be a frustrating setback. This error typically signifies that the allocated storage space for the database instance isn’t sufficient for its current demands. It’s worth noting that during and after a migration, changes in database workload or a temporary spike …

How to migrate RDS Postgres to AWS Aurora without downtime?

04/01/2024 by Philip

Migrating from RDS Postgres to AWS Aurora without downtime can be achieved by using Amazon’s Database Migration Service (AWS DMS) along with additional strategies for minimizing the impact on production systems. Here’s a general outline of the steps you would take: For detailed instructions and considerations, you can refer to the AWS documentation on migrating data …

How to Troubleshoot “ERROR: Could Not Serialize Access Due to Concurrent Update” in PostgreSQL: Expert Solutions for Database Conflicts

04/01/2024 by Philip

When handling databases in PostgreSQL, encountering errors related to concurrent updates is not uncommon. These errors often manifest as ‘ERROR: could not serialize access due to concurrent update’, which can be perplexing and halt the workflow. Understanding the dynamics of PostgreSQL’s transaction mechanisms is crucial to diagnose and resolve such issues effectively. Dealing with the …

Why Am I Getting the Error “Is the PostgreSQL Server Running Locally and Accepting Connections on Unix Domain Socket”? – Troubleshooting Guide for Server Connectivity Issues

04/01/202404/01/2024 by Philip

If you’re encountering the “Is the PostgreSQL server running locally and accepting connections on Unix domain socket?” error, this typically indicates an issue with the initialization or setup of your PostgreSQL server. When attempting to connect to a PostgreSQL database, the client software verifies whether the PostgreSQL service is active and reachable through the Unix …

How do you identify high load tables/indexes in Postgres

11/12/2022 by Philip

To identify high-load tables or indexes in Postgres, you can use the pg_stat_all_tables or pg_stat_all_indexes views. These views provide information about the access statistics for each table and index in a database. To access these views, you can connect to your Postgres database using a tool like psql and then run a query like the …

How can I secure a Postgres Database

11/12/2022 by Philip

There are several steps you can take to secure a Postgres database. Here are a few:

Use a strong password for the database administrator account to prevent unauthorized access.
Enable SSL connections to encrypt data transmitted between the database server and client applications.
Configure your database server to listen on a private network interface or localhost, instead of all interfaces. This will prevent remote connections to the database server.
Use the built-in Postgres role-based access control (RBAC) system to grant specific users access to specific database objects and operations.
Regularly back up your database to protect against data loss and enable recovery in case of a disaster.
Use Postgres’ built-in auditing capabilities to track and log access to the database, so you can monitor for suspicious activity and quickly identify and respond to security threats.
Keep your Postgres installation and all database extensions up to date with the latest security patches to protect against known vulnerabilities.

All about Logical Replication in Postgres.

04/01/202406/12/2022 by Philip

What is Logical Replication

Logical replication in PostgreSQL is a feature that allows you to replicate data from one database to another, in a flexible and customizable way. Unlike physical replication, which replicates the entire database and its structure, logical replication allows you to specify which tables and columns you want to replicate, and how you want the data to be replicated. This means that you can replicate only the data that is relevant to your application, and you can apply custom transformations or filters to the replicated data to meet your specific needs.

When and How do you use pg_rewind() in PostgreSQL?

06/12/2022 by Philip

The pg_rewind utility in PostgreSQL is used to synchronize a standby server with a new master server in a scenario where the old master server has been promoted to a new master server and the standby server needs to catch up with the new master server’s state. This utility can be used when the old master server still has the transaction logs (WAL) that were generated after the promotion, and it can be used to “rewind” the state of the standby server to the point in time where the promotion occurred.

To use the pg_rewind utility, you need to perform the following steps: