PostgreSQL

How to Address Increased I/O Latency in Aurora Postgres Post-Migration: Effective Troubleshooting Strategies

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Migrating to Aurora PostgreSQL offers a range of benefits, including scalability and managed services. However, post-migration, you might encounter increased I/O latency which can affect the performance and efficiency of your database operations. Addressing this requires a systematic approach where you assess the new environment, understand the root causes of latency, and apply optimisation techniques …

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How to Fix Insufficient Memory Errors in Aurora Postgres After Migration

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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 …

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

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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 …

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How to migrate RDS Postgres to AWS Aurora without downtime?

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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 …

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

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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 …

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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

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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 …

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How can I secure a Postgres Database

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

  1. Use a strong password for the database administrator account to prevent unauthorized access.
  2. Enable SSL connections to encrypt data transmitted between the database server and client applications.
  3. 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.
  4. Use the built-in Postgres role-based access control (RBAC) system to grant specific users access to specific database objects and operations.
  5. Regularly back up your database to protect against data loss and enable recovery in case of a disaster.
  6. 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.
  7. Keep your Postgres installation and all database extensions up to date with the latest security patches to protect against known vulnerabilities.

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

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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:

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How do I Re-Attach a Master once a Replica has been Promoted in Postgres

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To reattach a master server once a replica has been promoted in PostgreSQL, you need to perform the following steps:

  1. On the new master server, edit the postgresql.conf configuration file and set the wal_level parameter to hot_standby. This will enable the new master server to keep a sufficient amount of transaction log data (WAL) to allow the old master server to connect and apply the changes.
  2. Restart the new master server for the changes to take effect.
  3. On the old master server, edit the postgresql.conf configuration file and set the hot_standby parameter to on. This will enable the old master server to connect to the new master server and start receiving the changes.
  4. In the recovery.conf file on the old master server, add the following lines to specify the connection details for the new master server:

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