Web Reference: Jan 24, 2023 · The locking in a database can be done at 4 levels, which start with the database at the highest level and down via table and page to the row at the lowest level. Feb 26, 2026 · See Table 13.3 for a complete table of row-level lock conflicts. Note that a transaction can hold conflicting locks on the same row, even in different subtransactions; but other than that, two transactions can never hold conflicting locks on the same row. Feb 16, 2026 · PostgreSQL’s row-level locking mechanism is the invisible guardian that keeps your data consistent while allowing maximum concurrency. Let’s dive deep into how it works and see it in action.
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