bd15b7db48
As one might guess, this function dumps the sequence data. It is called once per sequence, and each such call executes a query to retrieve the relevant data 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 data with a single query at the beginning of pg_dump. This information is stored in a sorted array that dumpSequenceData() can bsearch() for what it needs. This follows a similar approach as previous commits that introduced sorted arrays for role information, pg_class information, and sequence metadata. 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 we use the brand new function pg_sequence_read_tuple() in the query that gathers all sequence data, so we must continue to use the preexisting query-per-sequence approach for versions older than 18. Reviewed-by: Euler Taveira, Michael Paquier, Tom Lane 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/.