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OceanDB Pro - A VigilesHQ consulting initiative

OceanBase Consulting and Technical Expertise

Guides, runbooks, and a sizing calculator for teams putting OceanBase into production. Migration checklists, Paxos and HA notes, performance work, and day-two operations.

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Not the official OceanBase website. Independent technical resource from VigilesHQ.

explain.sql
EXPLAIN ANALYZE SELECT o.order_id, c.name, SUM(l.amount)
FROM orders o
JOIN customers c ON c.id = o.customer_id
JOIN order_lines l ON l.order_id = o.order_id
WHERE o.created_at >= '2026-01-01'
GROUP BY o.order_id, c.name
ORDER BY SUM(l.amount) DESC
LIMIT 20;

+----+-------------+-------+------------+------+
| id | operation   | name  | est. rows  | time |
+----+-------------+-------+------------+------+
|  0 | TABLE SCAN  | lines |  2,400,000 |  45ms|
|  1 | HASH JOIN   | orders|     48,200 |  12ms|
|  2 | HASH GROUP  |       |         20 |   3ms|
+----+-------------+-------+------------+------+

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