https://www.yongjiexue.io/en/tags/pg-admin/Recent content in PG Admin on Yongjie XueHugoen-USTue, 24 Mar 2026 00:00:00 +0000https://www.yongjiexue.io/en/cloud/meituan-purge-photo/Tue, 24 Mar 2026 00:00:00 +0000https://www.yongjiexue.io/en/cloud/meituan-purge-photo/Many Android users reported that Meituan deleted files from their photo libraries. The bigger issue is not just this bug, but the still-common pattern of overbroad storage permissions in the Chinese Android ecosystem.https://www.yongjiexue.io/en/pg/pg-out-of-sync-202602/Thu, 19 Feb 2026 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-out-of-sync-202602/The PostgreSQL 18.2 minor-release train introduced regressions in substring() and WAL replay. Hold off on fresh deployments and upgrades, then update promptly after the out-of-cycle releases ship on 2026-02-26.https://www.yongjiexue.io/en/pg/pg-ha-sota/Fri, 23 Jan 2026 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-ha-sota/A deep dive into the SOTA approach for PostgreSQL HA. RTO/RPO breakdown, from theory to production. If you’re still wrestling with PG HA, this might save you years.https://www.yongjiexue.io/en/db/tuna-mirror-site/Sat, 22 Nov 2025 00:00:00 +0000https://www.yongjiexue.io/en/db/tuna-mirror-site/In serious production you can’t rely on an upstream that explicitly says “no guarantees.” When someone says “don’t count on me,” the right answer is “then I’ll run it myself.”https://www.yongjiexue.io/en/pg/pg-mirror-pigsty/Fri, 15 Aug 2025 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-mirror-pigsty/PostgreSQL official repos cut off global mirror sync channels, open-source binaries supply disrupted, revealing the true colors of various database and cloud vendors.https://www.yongjiexue.io/en/pg/pg-mirror-break/Mon, 07 Jul 2025 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-mirror-break/PGDG cuts off FTP rsync sync channels, global mirror sites universally disconnected - this time they really strangled global users’ supply chain.https://www.yongjiexue.io/en/db/ai-dba-job/Mon, 30 Jun 2025 00:00:00 +0000https://www.yongjiexue.io/en/db/ai-dba-job/Who will be revolutionized first - OLTP or OLAP? Integration vs specialization, how to choose? Where will DBAs go in the AI era? Feng’s views from the HOW 2025 conference roundtable, organized and published.https://www.yongjiexue.io/en/cloud/dba-vs-rds/Fri, 02 Feb 2024 00:00:00 +0000https://www.yongjiexue.io/en/cloud/dba-vs-rds/Two days ago, the ninth episode of Open-Source Talks had the theme “Will DBAs Be Eliminated by Cloud?” As the host, I restrained myself from jumping into the debate throughout, so I’m writing this article to discuss this question: Will DBAs be eliminated by cloud?https://www.yongjiexue.io/en/pg/pgss/Thu, 26 Oct 2023 00:00:00 +0000https://www.yongjiexue.io/en/pg/pgss/Query optimization is one of the core responsibilities of DBAs. This article introduces how to use metrics provided by pg_stat_statements for macro-level PostgreSQL query optimization.https://www.yongjiexue.io/en/db/rhel-compatibility/Mon, 09 Oct 2023 00:00:00 +0000https://www.yongjiexue.io/en/db/rhel-compatibility/RHEL-series OS distribution compatibility level: RHEL = Rocky ≈ Anolis > Alma > Oracle » Euler. Recommend using RockyLinux 8.8, or Anolis 8.8 for domestic requirements.https://www.yongjiexue.io/en/pg/pg-filedump/Wed, 27 Sep 2023 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-filedump/Backups are a DBA’s lifeline — but what if your PostgreSQL database has already exploded and you have no backups? Maybe pg_filedump can help you!https://www.yongjiexue.io/en/cloud/no-dba-bullshit/Wed, 01 Mar 2023 00:00:00 +0000https://www.yongjiexue.io/en/cloud/no-dba-bullshit/Guo Degang has a comedy routine: “Say I tell a rocket scientist, your rocket is no good, the fuel is wrong. I think it should burn wood, better yet coal, and it has to be premium coal, not washed coal. If that scientist takes me seriously, he loses.”https://www.yongjiexue.io/en/cloud/drop-rds/Tue, 10 May 2022 00:00:00 +0000https://www.yongjiexue.io/en/cloud/drop-rds/I recently witnessed a live cloud database drop-and-run incident. This article discusses how to handle accidentally deleted data when using PostgreSQL in production environments.https://www.yongjiexue.io/en/cloud/is-dba-good-job/Tue, 10 May 2022 00:00:00 +0000https://www.yongjiexue.io/en/cloud/is-dba-good-job/Ant Financial had a self-deprecating joke: besides regulation, only DBAs could bring down Alipay. Although DBA sounds like a profession with glorious history and dim prospects, who knows if it might become trendy again after a few terrifying major cloud database incidents?https://www.yongjiexue.io/en/pg/collate/Fri, 05 Mar 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/collate/What? Don’t know what COLLATION is? Remember one thing: using C COLLATE is always the right choice!https://www.yongjiexue.io/en/pg/replica-identity/Wed, 03 Mar 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/replica-identity/Replica identity is important - it determines the success or failure of logical replicationhttps://www.yongjiexue.io/en/pg/logical-replication/Wed, 03 Mar 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/logical-replication/This article introduces the principles and best practices of logical replication in PostgreSQL 13.https://www.yongjiexue.io/en/pg/slow-query/Tue, 23 Feb 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/slow-query/Slow queries are the sworn enemy of OLTP databases. Here’s how to identify, analyze, and fix them using metrics (Pigsty dashboards), pg_stat_statements, and logs.https://www.yongjiexue.io/en/pg/time-travel/Mon, 22 Feb 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/time-travel/Machine restarted due to failure, NTP service corrected PG time after PG startup, causing Patroni to fail to start.https://www.yongjiexue.io/en/pg/alter-type/Fri, 15 Jan 2021 00:00:00 +0000https://www.yongjiexue.io/en/pg/alter-type/How to change column types online, such as upgrading from INT to BIGINT?https://www.yongjiexue.io/en/pg/golden-metrics/Fri, 06 Nov 2020 00:00:00 +0000https://www.yongjiexue.io/en/pg/golden-metrics/Understanding the golden monitoring metrics in PostgreSQLhttps://www.yongjiexue.io/en/pg/entity-and-naming/Wed, 03 Jun 2020 00:00:00 +0000https://www.yongjiexue.io/en/pg/entity-and-naming/Concepts and their naming are very important. Naming style reflects an engineer’s understanding of system architecture. Poorly defined concepts lead to communication confusion, while carelessly set names create unexpected additional burden. Therefore, they need careful design.https://www.yongjiexue.io/en/pg/pg-load/Fri, 29 May 2020 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-load/Managing databases is similar to managing people - both need KPIs (Key Performance Indicators). So what are database KPIs? This article introduces a way to measure PostgreSQL load: using a single horizontally comparable metric that is basically independent of workload type and machine type, called PG Load.https://www.yongjiexue.io/en/pg/migrate-column-type/Thu, 30 Jan 2020 00:00:00 +0000https://www.yongjiexue.io/en/pg/migrate-column-type/How to modify PostgreSQL column types online? A general approachhttps://www.yongjiexue.io/en/pg/extension/Thu, 13 Jun 2019 00:00:00 +0000https://www.yongjiexue.io/en/pg/extension/Today encountered an interesting case where a customer reported database connection issues caused by extensions.https://www.yongjiexue.io/en/pg/pg-lock/Tue, 11 Jun 2019 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-lock/Snapshot isolation does most of the heavy lifting in PG, but locks still matter. Here’s a practical guide to table locks, row locks, intention locks, and pg_locks.https://www.yongjiexue.io/en/pg/replication-plan/Fri, 29 Mar 2019 00:00:00 +0000https://www.yongjiexue.io/en/pg/replication-plan/Replication is one of the core issues in system architecture.https://www.yongjiexue.io/en/pg/backup-plan/Sat, 02 Mar 2019 00:00:00 +0000https://www.yongjiexue.io/en/pg/backup-plan/There are various backup strategies. Physical backups can usually be divided into four types.https://www.yongjiexue.io/en/pg/pg-dump-failure/Tue, 11 Dec 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/pg-dump-failure/Sometimes, interactions between components manifest in subtle ways. For example, using pg_dump to export data from a connection pool can cause connection pool contamination issues.https://www.yongjiexue.io/en/pg/page-corruption/Thu, 29 Nov 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/page-corruption/Using binary editing to repair PostgreSQL data pages, and how to make a primary key query return two records.https://www.yongjiexue.io/en/pg/bloat/Sat, 06 Oct 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/bloat/PostgreSQL uses MVCC as its primary concurrency control technology. While it has many benefits, it also brings other effects, such as relation bloat.https://www.yongjiexue.io/en/pg/pipeline-intro/Fri, 07 Sep 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/pipeline-intro/PipelineDB is a PostgreSQL extension for streaming analytics. Here’s how to install it and build continuous views over live data.https://www.yongjiexue.io/en/pg/timescale-install/Fri, 07 Sep 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/timescale-install/TimescaleDB is a PostgreSQL extension plugin that provides time-series database functionality.https://www.yongjiexue.io/en/pg/sequence-overflow/Fri, 20 Jul 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/sequence-overflow/If you use Integer sequences on tables, you should consider potential overflow scenarios.https://www.yongjiexue.io/en/pg/xid-wrap-around/Fri, 20 Jul 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/xid-wrap-around/XID WrapAround is perhaps a unique type of failure specific to PostgreSQLhttps://www.yongjiexue.io/en/pg/mon-table-size/Mon, 14 May 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/mon-table-size/Tables in PostgreSQL correspond to many physical files. This article explains how to calculate the actual size of a table in PostgreSQL.https://www.yongjiexue.io/en/pg/pgadmin-install/Sat, 14 Apr 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/pgadmin-install/PgAdmin is a GUI program for managing PostgreSQL, written in Python, but it’s quite dated and requires some additional configuration.https://www.yongjiexue.io/en/pg/download-failure/Sun, 08 Apr 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/download-failure/Recently there was a perplexing incident where a database had half its data volume and load migrated away, but ended up being overwhelmed due to increased load.https://www.yongjiexue.io/en/pg/routine-maintain/Sat, 10 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/routine-maintain/Cars need oil changes, databases need maintenance. For PG, three important maintenance tasks: backup, repack, vacuumhttps://www.yongjiexue.io/en/pg/backup-overview/Fri, 09 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/backup-overview/Backup is the foundation of a DBA’s livelihood. With backups, there’s no need to panic.https://www.yongjiexue.io/en/pg/pgbackrest/Wed, 07 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/pgbackrest/PgBackRest is a set of PostgreSQL backup tools written in Perlhttps://www.yongjiexue.io/en/pg/pgbouncer-usage/Wed, 07 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/pgbouncer-usage/Pgbouncer is a lightweight database connection pool. This guide covers basic Pgbouncer configuration, management, and usage.https://www.yongjiexue.io/en/pg/logging/Tue, 06 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/logging/It’s recommended to configure PostgreSQL’s log format as CSV for easy analysis, and it can be directly imported into PostgreSQL data tables.https://www.yongjiexue.io/en/pg/fio/Tue, 06 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/fio/FIO is a convenient tool for testing disk I/O performancehttps://www.yongjiexue.io/en/pg/sysbench/Tue, 06 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/sysbench/Although PostgreSQL provides pgbench, sometimes you need sysbench to outperform MySQL.https://www.yongjiexue.io/en/pg/migration-without-downtime/Tue, 06 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/migration-without-downtime/Data migration typically involves stopping services for updates. Zero-downtime data migration is a relatively advanced operation.https://www.yongjiexue.io/en/pg/find-dummy-index/Sun, 04 Feb 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/find-dummy-index/Indexes are useful, but they’re not free. Unused indexes are a waste. Use these methods to identify unused indexes.https://www.yongjiexue.io/en/pg/ssh-add-key/Sun, 07 Jan 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/ssh-add-key/Quick configuration for passwordless login to all machineshttps://www.yongjiexue.io/en/pg/wireshark-capture/Fri, 05 Jan 2018 00:00:00 +0000https://www.yongjiexue.io/en/pg/wireshark-capture/Wireshark is a very useful tool, especially suitable for analyzing network protocols. Here’s a simple introduction to using Wireshark for packet capture and PostgreSQL protocol analysis.https://www.yongjiexue.io/en/pg/file_fdw/Fri, 01 Dec 2017 00:00:00 +0000https://www.yongjiexue.io/en/pg/file_fdw/With file_fdw, you can easily view operating system information, fetch network data, and feed various data sources into your database for unified viewing and management.