Re: Full Table Scans When LIMIT / OFFSET Are Used
WITH LIMIT OFFSET:
-> ORDER BY `t`.`third_party_reference_key`
-> LIMIT 18446744073709551610 OFFSET 0;
+----+-------------+-------+------------+-------+---------------+-----------------------------------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+-------+---------------+-----------------------------------+---------+------+------+----------+-------------+
| 1 | SIMPLE | t | NULL | index | reference_key | third_party_reference_key_version | 148 | NULL | 0 | 0.00 | Using where |
+----+-------------+-------+------------+-------+---------------+-----------------------------------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.05 sec)
WITHOUT
-> ORDER BY `t`.`third_party_reference_key`;
+----+-------------+-------+------------+------+---------------+---------------+---------+-------------+------+----------+---------------------------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+---------------+---------+-------------+------+----------+---------------------------------------+
| 1 | SIMPLE | t | NULL | ref | reference_key | reference_key | 153 | const,const | 1 | 100.00 | Using index condition; Using filesort |
+----+-------------+-------+------------+------+---------------+---------------+---------+-------------+------+----------+---------------------------------------+
1 row in set, 1 warning (0.05 sec)
Subject
Views
Written By
Posted
431
September 22, 2021 08:50AM
189
September 22, 2021 10:38AM
Re: Full Table Scans When LIMIT / OFFSET Are Used
162
September 22, 2021 03:16PM
185
September 22, 2021 03:27PM
278
September 22, 2021 05:34PM
158
September 22, 2021 08:09PM
Sorry, only registered users may post in this forum.
Content reproduced on this site is the property of the respective copyright holders.
It is not reviewed in advance by Oracle and does not necessarily represent the opinion
of Oracle or any other party.