How Can I Configure fillfactor

fillfactor is a parameter used to describe the page filling rate and is directly related to the number and size of tuples that can be stored on a page and the physical space of a table. The default page filling rate of Ustore tables is 92%. The reserved 8% space is used for page update and TD list expansion. For details about fillfactor, see "SQL Reference > SQL Syntax > CREATE TABLE" in Developer Guide.

You can configure fillfactor after analyzing services. If only query or fixed-length update operations are performed after table data is imported, you can increase the page filling rate to 100%. If a large number of variable-length updates are performed after data is imported, you are advised to retain or decrease the page filling rate to reduce performance loss caused by cross-page update. To view and modify fillfactor, perform the following steps:

gaussdb=# CREATE TABLE test(a int) with(fillfactor=100);
gaussdb=# \d+ test
                         Table "public.test"
 Column |  Type   | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
 a      | integer |           | plain   |              |
Has OIDs: no
Distribute By: HASH(a)
Location Nodes: ALL DATANODES
Options: orientation=row, fillfactor=100, compression=no, storage_type=USTORE, segment=off

gaussdb=# ALTER TABLE test set(fillfactor=92);
gaussdb=# \d+ test
                         Table "public.test"
 Column |  Type   | Modifiers | Storage | Stats target | Description
--------+---------+-----------+---------+--------------+-------------
 a      | integer |           | plain   |              |
Has OIDs: no
Options: orientation=row, compression=no, storage_type=USTORE, segment=off, fillfactor=92

gaussdb=# DROP TABLE test;
DROP TABLE