Oftentimes, especially on large datasets, you will want to convert this to a more human friendly format. To retrieve the raw bytes size of a specific table, including its tablespace and structure, we use the pg_table_size() function as our query like so: Example Query – How to get table size in postgresĮxample Result – How to get table size in postgres We’ll also go over the discrepancy you can observe between the raw size of a table space in memory versus the amount of disk space that identical data consumes on disk. This next set of questions will focus on these individual components and how to interact with them via postgres queries and functions. These three pieces can be calculated independently, but ultimately together make up the total overall size of a table. Those people standing in anticipation of their up coming stop so they can swiftly disembark is a great example of how indexes speed up databases tables. Table Indexes – Indexes are additional metadata in the form of quick reference tables that enumerate the commonly used columns to speed up processing. Harking back to our bus metaphor, indexes would be the standing hand-holds.Back to our bus analogy, this would be the entire contents of a row of seats, including those seats, and the people on them. Tablespace – This is the total measure of all the data within a table, including the table structure.Using the bus analogy, the structure would be how the seats are arranged and the space those seats themselves take up when empty. It is part of the tablespace, but it is not part of the user data. Table Structure – This is the framework that outlines what kind of data each column can hold.What are the three parts of a Postgres table?ĭatabase tables are split up in three individual components: Bus stops represent queries which are used to retrieve and deliver the correct people to their intended destination or to stop and pickup, then store in the tablespace (seats) for later use. They are a rigid structure in a specific configuration that has been optimized to handle its people (data). Columns make up the individual components of a record, e.g., name, age, address, favorite color, etc., while rows are each individual record contained in the list of stored records.Ĭontinuing our city bus analogy, the tables in your database are the seats. Tables are a skeletal structure within a database used to collate data into rows and columns of information that is easy to reference and updates as needed. Each bus stop along its route represents queries which can add/remove people (data) related to the stop in question. The seats on the bus would represent table structure while the individual people in those seats would be the data, or tablespace. You can think of a database like your local city bus. A properly optimized database structure leverages indexes to enumerate the most commonly accessed data, keeping queries fast and accurate, while retaining the ability to access any non-indexed data when necessary. Database software, at its most basic, aims to make your data storage more efficient by avoiding the hindrances of traditional flat file disk storage. Storing your application dataset in flat text files only takes you so far and will rapidly create a bottleneck that slows performance down to a snail’s crawl. What is a database?Ī database is a software framework used for storing, reading, and modifying the data that an application needs to manipulate. The posgres architecture is an industry titan where ease of use, speed, extensibility, and data security are pivotal to the success of your application. An open source alternative to Microsoft SQL, MySQL, MariaDB, and Percona MySQL, which make up the majority of the database software market share used in the IT Industry today. More commonly referred to as simply “postgres”, it has a proven track record for superior functionality, reliability and performance, dating all the way back to its conception in 1986. PostgresSQL is an object-relational database program along the same vane as MySQL, and is one of its biggest competitors.
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