What is this about? Many DDL statements in PostgreSQL support modified IF EXISTS / IF NOT EXISTS. For example: test=# create table if not exists mytable(); CREATE TABLE test=# drop table if exists mytable; DROP TABLE I recommend using `IF EXISTS` / `IF NOT EXISTS` in DDL only when necessary. Here are three examples that demonstrate how the overuse of these words may lead to negative consequences.|
Deploying DB schema changes in heavily loaded systems is challenging. In this article, we explore one of the challenges - how to avoid situations when DDLs get blocked, wait to acquire a lock, and during that, start blocking other sessions.| PostgresAI
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