timescaledb_information.compression_settings

Get information about compression-related settings for hypertables. Each row of the view provides information about individual orderby and segmentby columns used by compression.

Available Columns

NameDescription
hypertable_schema(NAME) Schema name of the hypertable
hypertable_name(NAME) Table name of the hypertable
attname(NAME) Name of the column used in the compression settings
segmentby_column_index(SMALLINT) Position of attname in the compress_segmentby list
orderby_column_index(SMALLINT) Position of attname in the compress_orderby list
orderby_asc(BOOLEAN) True if this is used for order by ASC, False for order by DESC
orderby_nullsfirst(BOOLEAN) True if nulls are ordered first for this column, False if nulls are ordered last

Sample Usage

  1. CREATE TABLE hypertab (a_col integer, b_col integer, c_col integer, d_col integer, e_col integer);
  2. SELECT table_name FROM create_hypertable('hypertab', 'a_col');
  4. ALTER TABLE hypertab SET (timescaledb.compress, timescaledb.compress_segmentby = 'a_col,b_col', 
  5.   timescaledb.compress_orderby = 'c_col desc, d_col asc nulls last');
  7. SELECT * FROM timescaledb_information.compression_settings WHERE hypertable_name = 'hypertab';
  9.  hypertable_schema | hypertable_name | attname | segmentby_column_index | orderby_column_in
  10. dex | orderby_asc | orderby_nullsfirst 
  11. -------------+------------+---------+------------------------+------------------
  12. ----+-------------+--------------------
  13.  public      | hypertab   | a_col   |                      1 |
  14.     |             | 
  15.  public      | hypertab   | b_col   |                      2 |
  16.     |             | 
  17.  public      | hypertab   | c_col   |                        |
  18.   1 | f           | t
  19.  public      | hypertab   | d_col   |                        |
  20.   2 | t           | f
  21. (4 rows)