Having talked about partitioning strategies and partition pruning this time we will have a look on how you can attach and detach partitions to and from an existing partitioned table. Postgres 10 has introduced a lot of basic infrastructure for table partitioning with the presence of mainly a new syntax, and a lot of work happens in this area lately with many new features added in version 11 which is currently in development. Before PostgreSQL 12, attaching a new partition to an existing table required the entire table to be fully locked preventing all reads and writes. Many applications cannot afford a momentary outage that this causes. This stored procedure is an example that adds a partition to the “transactions” table. First, you can now use CREATE INDEX on a partitioned table, a feature written by yours truly. PostgreSQL 11 What is the best way to generate default values for identity columns on partition tables. With Postgres 11, you can create a unique index on the master: pg11=# CREATE TABLE sale_amounts_2 ( pg11(# saledate date NOT NULL, pg11(# invoiceid INTEGER, pg11(# UNIQUE (saledate, invoiceid) pg11(# ) PARTITION BY RANGE (saledate); CREATE TABLE..and Postgres will take care of creating indexes on all existing and future child tables: The ALTER TABLE… ADD PARTITION command adds a partition to an existing partitioned table. If all of our queries specify a date(s), or date range(s), and those specified usually cover data within a single year, this may be a great starting strategy for partitioning, as it would result in a single table per year, with a manageable number of rows per table. Is above step acceptable (not much downtime/lock to Table) ?. There is no upper limit to the number of defined partitions in a partitioned table. release the lock of Table A and rename the existing table (Table A) to new name (Table C) rename the new table with partition (Table B) into Table A. In our series on Postgres performance, we will discuss table partitioning in this first part and indexing in the next. Managing large tables is a big challenge. https://dbtut.com/index.php/2019/12/30/table-partitioning-in-postgresql-11-2 to parent table •PostgreSQL 11 lets you add it to parent table and cascades the definition to partitions But only the outgoing foreign keys •Examples: create table accounts (id text primary key, branch_id int) partition by hash (id); create table accounts0 partition of accounts for values with (modulus 4, … This is because all the rows which we inserted are split into 3 partition tables process_partition_open, process_partition_in_progress and process_partition_done.. Luckily, Postgres 11 provides several ways of dealing with this problem. But maintaining good performance and manageability for those large tables is even a bigger challenge. In PostgreSQL 10, certain DDL would refuse to work when applied to a partitioned table, and required you to process each partition individually. process_partition table has 0 rows. In PostgreSQL 11 we have fixed a few of these limitations, as previously announced by Simon Riggs. Executor-stage partition pruning or faster child table pruning or parallel partition processing added (PostgreSQL 11) Hash partitioning (PostgreSQL 11) UPDATEs that cause rows to move from one partition to another (PostgreSQL 11) Routing tuples to partitions that are foreign tables (PostgreSQL 11) Here we see that, when we count only process_partition table then there are 0 rows. In this example, we truncate the timestamp column to a yearly table, resulting in about 20 million rows per year. 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