JSON Array Indexes in MySQL
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MySQL 8.0.17 has the ability to create indexes over JSON arrays to speed up your queries. This presentation shows examples and explain all you need to know about this new feature: How are array indexes created? How do they work? When are they used? Are there any limitations?
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![Copyright © 2019 Oracle and/or its affiliates.5
Limitations
Can be part of a multi-column index
Only one array expression per index
Avoiding combinatorial explosion
Can flatten and index nested arrays
CAST(json->'$.the_array[*][*]' AS UNSIGNED INT ARRAY)
Can't be PRIMARY
Can be UNIQUE](https://image.slidesharecdn.com/json-array-indexes-in-mysqlslideshare-191003082105/85/JSON-Array-Indexes-in-MySQL-5-320.jpg)
![Copyright © 2019 Oracle and/or its affiliates.6
How do I use it?
CREATE TABLE lottery (data JSON);
CREATE INDEX ticket_idx ON lottery ((CAST(data->'$.lottery_tickets' AS UNSIGNED INT ARRAY)));
INSERT INTO lottery VALUES
('{"id":1, "name":"Alice", "lottery_tickets": [1]}'),
('{"id":2, "name":"Bob", "lottery_tickets": [2,22]}'),
('{"id":3, "name":"Carol", "lottery_tickets": [3,33,333]}'),
('{"id":4, "name":"Dan", "lottery_tickets": [4,44,444,4444]}'),
('{"id":5, "name":"Erin", "lottery_tickets": [5,55,555,5555,55555]}');
Cast to array is only available
when creating a functional index
Type of array element](https://image.slidesharecdn.com/json-array-indexes-in-mysqlslideshare-191003082105/85/JSON-Array-Indexes-in-MySQL-6-320.jpg)
![Copyright © 2019 Oracle and/or its affiliates.8
How do I use it?
Find all rows that contain one or more of the given values
SELECT data
FROM lottery
WHERE JSON_OVERLAPS(data->'$.lottery_tickets', CAST('[22,44]' AS JSON));
Find everyone with at
least one winning ticket
New in
8.0.17](https://image.slidesharecdn.com/json-array-indexes-in-mysqlslideshare-191003082105/85/JSON-Array-Indexes-in-MySQL-8-320.jpg)
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- 1. Copyright © 2019 Oracle and/or its affiliates.1 JSON array indexes in MySQL Norvald H. Ryeng Software Development Senior Manager MySQL Optimizer Team October 2, 2019 New in 8.0.17
- 2. Copyright © 2019 Oracle and/or its affiliates.2 Safe harbor statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, timing, and pricing of any features or functionality described for Oracle’s products may change and remains at the sole discretion of Oracle Corporation.
- 3. Copyright © 2019 Oracle and/or its affiliates.3 Program agenda 1 What is it? 2 How do I use it? 3 Demo
- 4. Copyright © 2019 Oracle and/or its affiliates.4 What is it? Index of a JSON array A functional index over a JSON expression The expression evaluates to an array Several index entries per row One index entry per array element General mechanism, currently used for JSON arrays Used to speed up array lookups JSON_CONTAINS(…) JSON_OVERLAPS(…) MEMBER OF (…)
- 5. Copyright © 2019 Oracle and/or its affiliates.5 Limitations Can be part of a multi-column index Only one array expression per index Avoiding combinatorial explosion Can flatten and index nested arrays CAST(json->'$.the_array[*][*]' AS UNSIGNED INT ARRAY) Can't be PRIMARY Can be UNIQUE
- 6. Copyright © 2019 Oracle and/or its affiliates.6 How do I use it? CREATE TABLE lottery (data JSON); CREATE INDEX ticket_idx ON lottery ((CAST(data->'$.lottery_tickets' AS UNSIGNED INT ARRAY))); INSERT INTO lottery VALUES ('{"id":1, "name":"Alice", "lottery_tickets": [1]}'), ('{"id":2, "name":"Bob", "lottery_tickets": [2,22]}'), ('{"id":3, "name":"Carol", "lottery_tickets": [3,33,333]}'), ('{"id":4, "name":"Dan", "lottery_tickets": [4,44,444,4444]}'), ('{"id":5, "name":"Erin", "lottery_tickets": [5,55,555,5555,55555]}'); Cast to array is only available when creating a functional index Type of array element
- 7. Copyright © 2019 Oracle and/or its affiliates.7 New in 8.0.17 How do I use it? Find all rows where the array contains a given value SELECT data FROM lottery WHERE JSON_CONTAINS(data->'$.lottery_tickets', CAST(22 AS JSON)); or SELECT data FROM lottery WHERE 22 MEMBER OF (data->'$.lottery_tickets'); Find the one winner
- 8. Copyright © 2019 Oracle and/or its affiliates.8 How do I use it? Find all rows that contain one or more of the given values SELECT data FROM lottery WHERE JSON_OVERLAPS(data->'$.lottery_tickets', CAST('[22,44]' AS JSON)); Find everyone with at least one winning ticket New in 8.0.17
- 9. Copyright © 2019 Oracle and/or its affiliates.9 Demo MySQL 8.0.17
- 13. Copyright © 2019 Oracle and/or its affiliates.13 Feature descriptions and design details directly from the source https://mysqlserverteam.com/
- 14. Copyright © 2019 Oracle and/or its affiliates.14 Thank you! Norvald H. Ryeng Software Development Senior Manager MySQL Optimizer Team