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How to Implement a unique constraint in PostgreSQL when NULL conflicts with everything

To implement a unique constraint in PostgreSQL when NULL conflicts with everything, you can use the following method: Use the COALESCE function to replace any NULL values in the new column with a unique value, […]

How checkpointing is implemented in MySQL and PostgreSQL?

How is checkpointing implemented in MySQL and PostgreSQL? Checkpointing is a process that is used to periodically write dirty pages from the buffer pool to disk in order to free up memory and reduce the […]

How to control automatic database maintenance operations in PostgreSQL 15?

How to control automatic database maintenance operations in PostgreSQL 15? In PostgreSQL 15, automatic database maintenance is controlled by several configuration parameters. Here are a few examples: maintenance_work_mem – this parameter controls the amount of […]

How is the transaction model implemented in PostgreSQL?

How is the transaction model implemented in PostgreSQL? In PostgreSQL, transactions are implemented using the Multi-Version Concurrency Control (MVCC) model. This means that each transaction is given a snapshot of the database at the start […]

How to check which queries are active or blocked in PostgreSQL?

How to check which queries are active or blocked in PostgreSQL? You can use the pg_stat_activity view in PostgreSQL to check which queries are currently active or blocked. This view provides information about each running […]

How PostgreSQL Locking works with FOR UPDATE MODE queries?

How PostgreSQL Locking works with FOR UPDATE MODE queries? In PostgreSQL, when a query is executed with the FOR UPDATE mode, it places a lock on the selected rows. This lock prevents any other queries […]

Understanding locks and deadlocks in PostgreSQL

Understanding locks and deadlocks in PostgreSQL Locks in PostgreSQL are used to ensure that concurrent transactions do not interfere with each other. When a transaction modifies a piece of data, it will take out an [...]

How to use Sparse Index in PostgreSQL 15?

How to use Sparse Index in PostgreSQL 15? Sparse indexes are used in PostgreSQL when the table contains many null or empty values in the indexed column. These indexes can greatly reduce the size of [...]

How I/O cache influence PostgreSQL performance?

How I/O cache influence PostgreSQL performance? I/O cache plays an important role in PostgreSQL performance as it can greatly reduce the number of disk I/O operations that need to be performed. The PostgreSQL server uses [...]

Inspecting PostgreSQL Locks

Inspecting PostgreSQL Locks Inspecting PostgreSQL locks can be done using the pg_locks view in the system catalog. This view displays information about all currently held and awaited locks. The columns in this view include the [...]

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