PostgreSQL uses a “multi-version concurrency control” (MVCC) approach to ensure that shared locks don’t starve requests for exclusive or update locks. Under MVCC, each transaction works with a “snapshot” of the database state at a […]
In PostgreSQL 16, you can reserve connections for the pg_use_reserved_connections group by modifying the postgresql.conf file. The pg_use_reserved_connections group is a special group of connections that are reserved for superusers and other critical system processes, […]
In PostgreSQL, row-level locks are implemented using a combination of lock modes and conflict resolution. When a transaction modifies a row in a table, it acquires a lock on that row to prevent other transactions […]
pgBadger is a PostgreSQL log analyzer that can be used to analyze and summarize the PostgreSQL log files to help identify performance issues and troubleshoot problems. Here are the steps to install and configure pgBadger […]
Large indexes in PostgreSQL can corrupt execution plans by causing the query planner to choose suboptimal plans due to the cost of scanning the large index. When the size of an index exceeds the effective_cache_size […]
PostgreSQL 15 introduced a new feature called “asynchronous commit”, which can help reduce replication lag by allowing multiple transactions to be committed concurrently. This feature works by allowing the server to continue processing new transactions […]
Thread contention in PostgreSQL occurs when multiple threads are competing for the same resources, such as CPU time, disk I/O, or database locks. This can lead to performance degradation, slower response times, and even database […]
In PostgreSQL, the catalog tables are system tables that store metadata information about the database objects such as tables, indexes, functions, and users. The catalog tables can be used to troubleshoot contention issues by providing […]
In PostgreSQL, shared buffers serve as the shared memory pool used to cache data pages in memory to improve read performance. Whenever a query needs to access data, it checks if the required pages are […]
Indexes in MariaDB are implemented as data structures that allow faster data retrieval from tables. There are several types of indexes available in MariaDB, each with its own characteristics and use cases. Here’s an overview […]
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