In this example, the master node is used to define list partitions.Ħ) Create a data table in the remote database. You can define the multi-level partitions in the master node or a remote database. You can attach the next-level partitions of these tables using the fdw external table. create table tbl_log0 PARTITION OF tbl_log FOR VALUES WITH ( MODULUS 4, REMAINDER 0) PARTITION BY hash (orderid) Ĭreate table tbl_log1 PARTITION OF tbl_log FOR VALUES WITH ( MODULUS 4, REMAINDER 1) PARTITION BY hash (orderid) Ĭreate table tbl_log2 PARTITION OF tbl_log FOR VALUES WITH ( MODULUS 4, REMAINDER 2) PARTITION BY hash (orderid) Ĭreate table tbl_log3 PARTITION OF tbl_log FOR VALUES WITH ( MODULUS 4, REMAINDER 3) PARTITION BY hash (orderid) The first level is the id hash partition, and the second level is the orderid partition. create table tbl_user (id int, info text, crt_time timestamp) PARTITION BY hash (id) Ĭreate table tbl_log (id int, orderid int8, info text, crt_time timestamp) PARTITION BY hash (id) For a multi-level partition table, create a hash partition. OPTIONS (user 'dtstest', password 'xxx') ĥ) Run the master command to create a primary table or primary partition. OPTIONS (host 'pgm-bp11lllmi55hyq68118070.pg.', port '3433', dbname 'shard3') Ĥ) Run the master command to configure the local account to connect it to the remote instance server after connecting the database account of the master. create extension postgres_fdw ģ) Run the master command to create a remote server instance. Remote instance 2: create database shard2 with owner dtstest Ĭreate database shard3 with owner dtstest ģ) Run the master command to create the fdw plug-in. Remote instance 1: create database shard0 with owner dtstest Ĭreate database shard1 with owner dtstest create database master with owner dtstest Specific Procedures export PGPASSWORD=xxxġ) master: create a master database. All operations are not affected, except that you can push down some queries and some cannot be. Operations such as select, insert, update, delete, join, group, and sort are supported. Pgm-bp11lllmi55hyq68118070.pg.ġ) Create postgres_fdw and a primary table or primary partition on the master node and enable access to master through the application.Ģ) Create a partitioned table in a shard node.ģ) Create an external table for these partitioned tables on the master node.Ĥ) Attach an external table to the primary table as a partition.ĥ) Access the primary table of the master, and data is routed automatically to a shard node. postgres_fdw and Partitioned Table Sharding for Database and Table Sharding Already, Bruce has publicly shared the community's idea of using postgres_fdw for sharding many times. In the future, the PostgreSQL community will work on this to achieve better performance and functions. However, you should understand how to use postgres_fdw with a partitioned table to split a database and table. We recommend Greenplum for an analysis business. It is highly efficient to implement simple database and table sharding in the business layer. ![]() Therefore, you can isolate enterprise data through schema or database. Each enterprise has one set of databases, and cross-enterprise data operations are not supported. For OLTP business, we recommended using Citus or decision-making database sharding at the application layer, such as scenarios like Platform as a Service (PaaS) or enterprise (ERP). For a business to use database and table sharding, specify whether it is an analysis business or an online transaction processing (OLTP) business.A single PostgreSQL database is enough for simple addition, deletion, modification, and query operations.You can perform database and table sharding using PostgreSQL postgres_fdw and the partition table interfaces. ![]() They can also communicate with the ApsaraDB RDS for MySQL instances. All the ApsaraDB RDS for PostgreSQL instances in the same VPC can communicate with each other.
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