November 2019
Beginner to intermediate
470 pages
11h 59m
English
Content preview from Mastering PostgreSQL 12 - Third Edition
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What is PostgreSQL able to do in parallel?
As we've already mentioned in this section, the support for parallelism has been gradually improved since PostgreSQL 9.6. In every version, new stuff is added.
The following are the most important operations that can be done in parallel:
- Parallel sequential scans
- Parallel index scans (btrees only)
- Parallel bitmap heap scans
- Parallel joins (all types of joins)
- Parallel btree creation (CREATE INDEX)
- Parallel aggregation
- Parallel append
In PostgreSQL 11, the support for parallel index creation has been added. Normal sort operations are not fully parallel yet – so far, only btree creation can be done in parallel. To control the amount of parallelism, we need to apply the following parameter:
test=# ...
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