With "equivalent" upserts, it's about ~66,000 TPS. On an 8 core test server, I can sustain ~90,000 ordinary insert transactions per second on an unlogged table defined as follows: create unlogged table foo ( merge serial primary key, b int4, c text ); In all cases pgbench uses 8 clients (1 per CPU core). In this case, neither of the proposed records were added, even if only the first one had a conflict. Spoiler alert, you could be surprised by non expected returns, so bare with me. When you add a UNIQUE constraint to a column or a group of columns, PostgreSQL will automatically create a unique index on the column or the group of columns. On 21 May 2015 at 16:27, Peter Geoghegan wrote: > Try and convince me. The following statement creates a new table named person with a … When creating tables, SQLAlchemy will issue the SERIAL datatype for integer-based primary key columns, which generates a sequence and server side default corresponding to the column. I'm having a little bit of trouble detecting a conflict on a table with a unique constraint. Unique constraints and primary keys are not inherited in the current implementation. If we want to continue adding any rows that do not have a conflict, we can use a ON CONFLICT DO NOTHING clause.. PostgreSQL UNIQUE constraint example. Execute the following command to create a test table with one field as the unique key or primary key. Ask Question Asked 1 year, 8 months ago. Thus, it is not necessary to create an index explicitly for primary key columns. peewee.ProgrammingError: column "playerindex" does not exist PostgreSQL supports sequences, and SQLAlchemy uses these as the default means of creating new primary key values for integer-based primary key columns. (See CREATE INDEX for more information.) Let's take a look into Ecto's implementation of PostgreSQL Upsert and how different types of primary keys could change the results of this command. > (There is no "try") CREATE TABLE customers (username TEXT PRIMARY KEY ... You have a primary key on id - that's also a unique constraint – a_horse_with_no_name Apr 15 '19 at 15:15. add a comment | 1 Answer Active Oldest Votes. create table test(id int primary key, info text, crt_time timestamp); Upsert Usage Example for Versions Later Than 9.5. Indexes: "player_pkey" PRIMARY KEY, btree (id) "playerindex" UNIQUE, btree (discord_member_id, guild_id) My guess is that postgres wants the index referred to without quotation marks perhaps, but peewee is inserting them? Here, we tell PostgreSQL to move on if a conflict occurs and continue processing the other rows: PostgreSQL automatically creates an index for each unique constraint and primary key constraint to enforce uniqueness. 1. ON CONFLICT ON CONSTRAINT fail postgresql. PostgreSQL: Primary Key / Unique conflict detection issues Forum: Help. Creator: Johan Dahlin Created: 2016-05-11 Updated: 2016-05-11 Johan Dahlin - 2016-05-11 Hey! For versions earlier than PostgreSQL 9.5, use functions or the with syntax to implement functions similar to upsert. WITH ins AS ( INSERT INTO key_phrase (body) VALUES (:phrase) ON CONFLICT (body) DO UPDATE SET body = NULL WHERE FALSE RETURNING id ) SELECT id FROM ins UNION ALL SELECT id FROM key_phrase WHERE body = :phrase LIMIT 1; This will return the id of a newly created record or the id of the existing record. PostgreSQL 9.5: Insert IF not Exists, Update IF Exists (Insert ON CONFLICT option) PostgreSQL 9.4: Using FILTER CLAUSE, multiple COUNT(*) in one SELECT Query for Different Groups PostgreSQL: Allow single NULL for UNIQUE Constraint Column Are not inherited in the current implementation we can use a ON conflict do NOTHING clause so! 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