What is pg_isready? pg_isready is a command-line utility included with PostgreSQL that checks the connection status of a PostgreSQL database server. It is particularly useful for automation scripts and health checks to verify if the PostgreSQL server is up and ready to accept connections. The utility returns an exit status code that reflects the result …
What is pg_prewarm? pg_prewarm is a PostgreSQL module that allows you to load relation data into the PostgreSQL shared buffer cache or the operating system’s buffer cache before it is needed. This can be particularly useful after a database restart, as it helps to avoid the performance penalties typically associated with “cold” caches, where the …
What is pg_standby? pg_standby is a command-line utility included with PostgreSQL that supports the creation of a warm standby server. It is used as a restore_command to manage the restoration of Write-Ahead Logs (WAL) from a backup during recovery or when setting up a standby server. This utility allows a PostgreSQL server to remain in …
What is pg_waldump? pg_waldump is a command-line utility included with PostgreSQL that allows you to display the contents of Write-Ahead Logging (WAL) files in a human-readable format. WAL is a fundamental component of PostgreSQL’s architecture, providing data durability and supporting features like replication and point-in-time recovery. The pg_waldump utility is useful for inspecting WAL files …
The 42501 error code in PostgreSQL indicates an insufficient_privilege error, which means the user does not have the necessary permissions to perform the requested action on a database object such as a table, schema, function, or another database resource. To diagnose and fix the 42501 insufficient_privilege error, you’ll need to identify the specific action that …
The P0004 error code in PostgreSQL is associated with an assert_failure condition. This error is raised within PL/pgSQL code when an ASSERT statement fails. The ASSERT statement is used to check for a condition that must be true unless there is a bug in the program. If the condition evaluates to false, an assert failure …
The HV00J error code in PostgreSQL refers to fdw_option_name_not_found. This error occurs when a foreign data wrapper (FDW) option that is expected by the foreign server, user mapping, or foreign table does not exist. This could be due to a misspelling, omission in the definition, or use of an option that is not supported by …
The HV024 error code in PostgreSQL is related to foreign data wrappers (FDWs), and it indicates an fdw_invalid_attribute_value condition. This error typically means that an attribute or a column value in a foreign table does not comply with the expected format defined by the foreign data wrapper. To diagnose and fix the HV024 fdw_invalid_attribute_value error, …
The 58P02 error code in PostgreSQL indicates a duplicate_file issue, which occurs when a duplicate file is found in the PostgreSQL database, suggesting that the same file exists in multiple locations. This can happen in various scenarios, such as when a tablespace is being created or a file is being copied, and the target file …
The XX000: internal_error is a generic error code in PostgreSQL that indicates an unexpected internal error has occurred. This type of error can be caused by a variety of issues, ranging from bugs in PostgreSQL itself to problems with system resources, hardware, or external factors affecting the database server. Diagnosing and fixing an XX000: internal_error …