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PostgreSQL Crash Trashing: How Cache Trashing Happens in PostgreSQL 15

Cache trashing in PostgreSQL 15 occurs when there is high contention for the shared buffer cache. This can happen when there are many concurrent queries accessing the same data, or when there is a lack […]

MySQL Checkpointing: How It 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 […]

PostgreSQL 15 Maintenance Operations: Controlling Automatic Database Maintenance

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 […]

PostgreSQL Transaction Model MVCC: How It Is Implemented

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 […]

PostgreSQL Queries Blocked: How to Check Active vs Blocked Queries

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 […]

PostgreSQL FOR UPDATE MODE Queries: How Locking Works

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 […]

How to handle NULL values in PostgreSQL

How to handle NULL values in PostgreSQL IS NULL: This operator is used to check if a column or expression is NULL. Example: SELECT * FROM table WHERE column_name IS NULL; IS NOT NULL: This […]

PostgreSQL I/O Cache: How It Influences 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 [...]

PostgreSQL Slow Query: How to Tune It

How to tune a slow query in PostgreSQL? Tuning a slow query in PostgreSQL can involve several steps. Here are some general steps to take: Identify the slow query: Use the pg_stat_activity view to see [...]

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