68e9629985
This function dumps the sequence definitions. It is called once per sequence, and each such call executes a query to retrieve the metadata for a single sequence. This can cause pg_dump to take significantly longer, especially when there are many sequences. This commit improves the performance of this function by gathering all the sequence metadata with a single query at the beginning of pg_dump. This information is stored in a sorted array that dumpSequence() can bsearch() for what it needs. This follows a similar approach as commits d5e8930f50 and 2329cad1b9, which introduced sorted arrays for role information and pg_class information, respectively. As with those commits, this patch will cause pg_dump to use more memory, but that isn't expected to be too egregious. Note that before version 10, the sequence metadata was stored in the sequence relation itself, which makes it difficult to gather all the sequence metadata with a single query. For those older versions, we continue to use the preexisting query-per-sequence approach. Reviewed-by: Euler Taveira Discussion: https://postgr.es/m/20240503025140.GA1227404%40nathanxps13
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.