postgres table size on disk

Table size Informationpostgres=# SELECT *, Pg_size_pretty (total_bytes) as Totalpostgres-#, Pg_size_pretty (index_bytes) as Indexpostgres-#, Pg_size_pretty (toast_bytes) as Toastpostgres-#, Pg_size_pretty (table_bytes) as tablepostgres-# from

First, restore disk space: In PostgreSQL, data rows that are deleted or updated using the Delete and UPDATE statements are not actually deleted, but only the state of the row is deleted or expired on the physical address of the old version of the

From Disk partition to Postgresqlinstallation[Email protected] mnt]# Fdisk/dev/sdbWelcome to Fdisk (Util-linux 2.23.2).Changes'll remain in memory only, until the decide to write them.Be careful before using the Write command.Command (M for help):

I. restore disk space In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row sets the row status to deleted or expired. Therefore, when data in a

I. Introduction to CSTORE_FDWHTTPS://GITHUB.COM/CITUSDATA/CSTORE_FDW, this external table extension is developed by Citusdata Corporation, which uses the Orc_file format to store data in columns.　　Advantage 1: Because of the compression, so the

A good algorithm, implementation. Ultimately, I'm going to do IO.The use of traditional mechanical hard disk, the storage of big data is also OK, but the database content acquisition is really poor to a realm. Here is an exploration:Disk Performance:

Installation process: 1. Configuration--prefix=prefix Install all files under the directory PREFIX instead of Usr/local/psql--with-pgport=number Set number as the default port number for server and clients,the default is

one of the ways that PostgreSQL master-slave replication is implemented:Standby-based asynchronous stream replication, which is a nice feature provided after the postgresql9.x version (2010.9), similar functionality is available in Oracle after 11g

warehouse_db=# CREATE TABLE item (item_id Integer not null,item_name text,item_price numeric,item_data text);CREATE TABLEwarehouse_db=# CREATE INDEX Item_idx on item (ITEM_ID);CREATE INDEXwarehouse_db=# \di Item_idxList of relationsSchema | Name |

1. Initial state: Master,slave are running states.2. Upgrade processMaster1). Turn off the master record last checkpoint location (latest checkpoint locations), which is where the downtime begins (this is where your downtime starts).The Postgres