![]() However when I instead select a top-level path of the same jsonb column, the query slows down by 6x (3241ms). This should mean a little improvement in performance, but they cannot use the existence operator (). So here them go: You can use the jsonbpathops operator class instead of the (default) jsonbops. When I SELECT the entire jsonb column, the query is fast (574 ms). There may be some improvements, but dont expect huge performance advantages. The regular JSON data type in PostgreSQL stores JSON data as plain text, without any binary encoding or special indexing support. ![]() > Bitmap Index Scan on t_extract_taxids_idx (cost=0.00.12.07 rows=10 width=0) (actual time=0.008.0. I have a single SELECT that queries both regular postgres tables and a jsonb column. Recheck Cond: (extract_taxids(payload) ''::jsonb) ![]() The major practical difference is one of efficiency. The json and jsonb data types accept almost identical sets of values as input. To implement efficient query mechanisms for these data types, PostgreSQL also provides the jsonpath data type described in Section 8.14.7. I am trying to build a query which (distinctly) groups values from JSONb columns, and also sums values from others, and non JSONb columns. PostgreSQL offers two types for storing JSON data: json and jsonb. As you can see the situation here is opposite, all keys and values are following in the natural order, with value type, value size etc. We can clearly see some parts of its structure and grouped together keys and values. SELECT jsonb_agg(j) FROM (SELECT jsonb_array_elements(a_json->'stakeholders')->'person'->'taxId' AS j) AS jĬREATE INDEX ON T USING gin (extract_taxids(payload)) Īnd voila: EXPLAIN ANALYZE select * from T where extract_taxids(payload) '' īitmap Heap Scan on t (cost=12.08.52.38 rows=10 width=36) (actual time=0.101.0.102 rows=1 loops=1) Version PostgreSQL 11.7 on x8664-pc-linux-gnu, compiled by gcc, a 224fe214a p 3971489d3e, 64-bit. Here is what jsonb document looks like in PostgreSQL. Below is one example: ]'::jsonb)įor using more specific index I use modified approach by: How do you create a Postgresql JSONB array in array index? CREATE OR REPLACE FUNCTION extract_taxids(a_json jsonb). ![]() Table structure is shown as below: CREATE TABLE T (ĬREATE INDEX ON T USING gin (payload jsonb_path_ops) We are using Postgres jsonb type in one of our DB tables. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |