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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 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 [...]

How NULL values in PostgreSQL affect performance?

How NULL values in PostgreSQL affect performance? NULL values in PostgreSQL can have an impact on the performance of queries and calculations, depending on how they are handled. Indexes: Indexes on columns that contain NULL [...]

How expensive SQLs can impact PostgreSQL Performance?

How expensive SQLs can impact PostgreSQL Performance? Expensive SQLs can have a significant impact on PostgreSQL performance, as they consume a lot of resources and can slow down the entire system. Here are a few [...]

How to Kill an PostgreSQL process from inside PostgreSQL?

How to Kill an PostgreSQL process from inside PostgreSQL? In PostgreSQL, you can use the pg_terminate_backend() function to kill a specific process. This function takes a single argument, the process ID of the process you [...]

Find When was a table last changed in PostgreSQL?

Find When was a table last changed in PostgreSQL? In PostgreSQL, you can use the pg_class system catalog table to determine when a table was last changed. The pg_class table contains metadata about all tables [...]

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