mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-23 14:39:15 +08:00
6a9db8a621
A new function, `get_chunk_relstats()`, allows fetching relstats
(basically `pg_class.{relpages,reltuples`) from remote chunks on data
nodes and writing it to the `pg_class` entry for the corresponding
local chunk. The function expects either a chunk or a hypertable as
input and returns the relstats for the given chunk or all chunks for
the given hypertable, respectively.
Importing relstats as described is useful as part of a distributed
ANALYZE/VACUUM that won't require fetching all data into the access
node for local sampling (like the current implemention does).
In a future change, this function will be called as part of a local
ANALYZE on the access node that runs ANALYZE on all data nodes
followed by importing of the resulting relstats for the analyzed
chunks.