9c02e3a986
Currently, pg_dump gathers attribute statistics with a query per
relation, which can cause pg_dump to take significantly longer,
especially when there are many relations. This commit addresses
this by teaching pg_dump to gather attribute statistics for 64
relations at a time. Some simple tests showed this was the optimal
batch size, but performance may vary depending on the workload.
Our lookahead code determines the next batch of relations by
searching the TOC sequentially for relevant entries. This approach
assumes that we will dump all such entries in TOC order, which
unfortunately isn't true for dump formats that use
RestoreArchive(). RestoreArchive() does multiple passes through
the TOC and selectively dumps certain groups of entries each time.
This is particularly problematic for index stats and a subset of
matview stats; both are in SECTION_POST_DATA, but matview stats
that depend on matview data are dumped in RESTORE_PASS_POST_ACL,
while all other stats are dumped in RESTORE_PASS_MAIN. To handle
this, this commit moves all statistics data entries in
SECTION_POST_DATA to RESTORE_PASS_POST_ACL, which ensures that we
always dump them in TOC order. A convenient side effect of this
change is that we can revert a decent chunk of commit
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| README.md | ||
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/.