Answer by Laurenz Albe for What is Postgres lock behaviour when UPDATE WHERE...
For the discussion, let's assume your execution plan looks like QUERY PLAN -------------------------- Update on mytab -> Seq Scan on mytab Filter: (id = 1)I also assume that you are using the...
View ArticleWhat is Postgres lock behaviour when UPDATE WHERE clause does a table scan?
Say you have a large table with tens of millions of rows.You want to UPDATE large_table SET col=value WHERE col=other_value... but col is not indexed and an EXPLAIN shows that this query will perform a...
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