From e69d9b4238aec9bc2d35064b348fd7fb7419eff9 Mon Sep 17 00:00:00 2001 From: Kamran Ahmed Date: Wed, 19 Apr 2023 15:28:14 +0100 Subject: [PATCH] Add PEV2 --- public/jsons/roadmaps/postgresql-dba.json | 2 +- .../103-query-analysis/102-pev.md | 37 ------------------- .../103-query-analysis/102-pev2.md | 22 +++++++++++ 3 files changed, 23 insertions(+), 38 deletions(-) delete mode 100644 src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev.md create mode 100644 src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev2.md diff --git a/public/jsons/roadmaps/postgresql-dba.json b/public/jsons/roadmaps/postgresql-dba.json index 8bc63d85b..47c17e382 100644 --- a/public/jsons/roadmaps/postgresql-dba.json +++ b/public/jsons/roadmaps/postgresql-dba.json @@ -1 +1 @@ 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a/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev.md b/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev.md deleted file mode 100644 index aaf562248..000000000 --- a/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev.md +++ /dev/null @@ -1,37 +0,0 @@ -# Pev - A PostgreSQL Explain Visualizer - -As you delve deeper into query analysis, it becomes important to understand and visualize the execution plans of your queries. One highly recommended tool for this purpose is `pev`, short for **PostgreSQL Explain Visualizer**. - -Pev is an open-source, web-based platform that takes the output of the `EXPLAIN` or `EXPLAIN ANALYZE` command and turns it into an intuitive and interactive graphical representation, allowing you to better understand and optimize query performance. - -## Features -- Color-coded nodes for intuitive understanding of scan types and costs -- Detailed information on each node with metrics like duration, loops, cost, and rows -- Zoom in and out for easy navigation through complex plans -- Supports various output formats (JSON, YAML, and XML) - -## Using Pev - -In order to use Pev, follow these steps: - -- Run your query with the `EXPLAIN` or `EXPLAIN ANALYZE` command in PostgreSQL to generate the query execution plan. - - ``` - EXPLAIN (FORMAT JSON) SELECT * FROM my_table WHERE id = 1; - ``` - -- Copy the resulting JSON output. - -- Head to the [Pev online visualizer](https://tatiyants.com/pev/) (or a [local instance](https://github.com/AlexTatiyants/pev) if you prefer) and paste the JSON output into the text box. - -- Pev will automatically generate an interactive, graphical representation of your query's execution plan to better comprehend the query's cost breakdown and any potential bottlenecks. - -## Example: - -Here's a sample of how Pev represents an execution plan. Note the easily distinguishable scan types with color-coding, and how the tooltips provide additional details when hovering over nodes. - -![Pev Example](https://tatiyants.com/pev/img/tooltip.png) - -## Summary - -In conclusion, Pev is an essential tool for any PostgreSQL developer looking to analyze and optimize their queries. By providing a clear visual representation of query execution plans, it enables you to quickly spot areas of improvement and ensure the overall efficiency of your database operations. \ No newline at end of file diff --git a/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev2.md b/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev2.md new file mode 100644 index 000000000..8918a2335 --- /dev/null +++ b/src/data/roadmaps/postgresql-dba/content/111-troubleshooting-techniques/103-query-analysis/102-pev2.md @@ -0,0 +1,22 @@ +# PEV2 + +`pev2`, or *Postgres Explain Visualizer v2*, is an open-source tool designed to make query analysis with PostgreSQL easier and more understandable. By providing a visual representation of the `EXPLAIN ANALYZE` output, `pev2` simplifies query optimization by displaying the query plan and execution metrics in a readable structure. In this section, we cover the key features of `pev2` and explore how it assists in query analysis. + +* **Visual Representation**: `pev2` converts the raw text output of an `EXPLAIN ANALYZE` query into an interactive and color-coded tree structure that is easy to understand at a glance. + +* **Query Plan Metrics**: The tool provides useful execution metrics, such as the query's total execution time, processing steps, and related node costs. + +* **Powerful Interactivity**: Hovering over specific nodes in the visual representation displays additional information, like the time spent on a specific step or the number of rows processed. + +* **Indented JSON Support**: `pev2` supports indented JSON parsing, making it easier to read and understand the plan for large and complex queries. + +* **Save and Share Plans**: The tool allows you to save your query plans as a URL, facilitating easy sharing with your colleagues. + +To use `pev2`, follow these steps: +1. Run your `EXPLAIN ANALYZE` query in your preferred PostgreSQL client. +2. Copy the output text. +3. Visit [https://explain.depesz.com/](https://explain.depesz.com/). +4. Paste the copied output in the text box and click "Explain." +5. Explore the visual representation of the query plan and analyze your query's performance. + +Now that you are familiar with `pev2`, use it to better understand and optimize your PostgreSQL queries. Remember, fine-tuning your queries can significantly improve performance and ensure a seamless experience for end-users. Happy optimizing!