同じクラスタに計画を説明します。ノード0-3と4の違いは、最初のものがバランサにあり、ノード4がバランサから外れている(しかしクラスタ内にある)ことです。は、私はこのクエリに問題がある
問題は4つのサーバー-3)クエリーが本当に遅い(15秒)、もう1つ(ノード4)クエリーが本当に速い(0,002)
アフリカ、説明計画は同じでなければならないが、私はEXPLAIN
と結果を実行する(スロー)
+----+-------------+-------+------+-------------------------------------------------------------+--------------+---------+-------------------------------+---------+---------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+-------------------------------------------------------------+--------------+---------+-------------------------------+---------+---------------------------------------+ | 1 | SIMPLE | uca2 | ref | PRIMARY,user_call_id,user_call_id_2 | user_call_id | 4 | const | 1 | Using index | | 1 | SIMPLE | uc | ALL | PRIMARY,user_call_id | NULL | NULL | NULL | 2098152 | Using join buffer (Block Nested Loop) | | 1 | SIMPLE | uca | ref | user_call_id,user_call_id_2,is_validated_with | user_call_id | 4 | db.uc.user_call_id | 1 | Using where | +----+-------------+-------+------+-------------------------------------------------------------+--------------+---------+-------------------------------+---------+---------------------------------------+
ノード0-3:これは、 10ノード4(高速)
+----+-------------+-------+--------+-------------------------------------------------------------+---------------------------------+---------+-----------------------------------+---------+-----------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+--------+-------------------------------------------------------------+---------------------------------+---------+-----------------------------------+---------+-----------------------+ | 1 | SIMPLE | uca2 | ref | PRIMARY,user_call_id,user_call_id_2 | user_call_id | 4 | const | 1 | Using index | | 1 | SIMPLE | uca | ref | user_call_id,user_call_id_2,is_validated_with | is_validated_with | 5 | db.uc2.user_activity_id | 2755595 | Using index condition | | 1 | SIMPLE | uc | eq_ref | PRIMARY,user_call_id | PRIMARY | 4 | db.uca.user_call_id | 1 | NULL | +----+-------------+-------+--------+-------------------------------------------------------------+---------------------------------+---------+-----------------------------------+---------+-----------------------+
私は、低速のものではインデックスが使用されていないことに気付きます。
ノード0:
+-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | users_calls | 0 | PRIMARY | 1 | user_call_id | A | 2099153 | NULL | NULL | | BTREE | | | | users_calls | 1 | call_group_id | 1 | call_group_id | A | 16659 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_call_begin_date | 1 | user_call_begin_date | A | 1049576 | NULL | NULL | YES | BTREE | | | | users_calls | 1 | user_call_begin_date | 2 | user_call_end_date | A | 2099153 | NULL | NULL | YES | BTREE | | | | users_calls | 1 | user_call_id | 1 | user_call_id | A | 2099153 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_call_id | 2 | user_id | A | 2099153 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 1 | user_id | A | 91267 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 2 | call_id | A | 2099153 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 3 | user_call_status | A | 2099153 | NULL | NULL | | BTREE | | | | users_calls | 1 | fk_users_calls_calls | 1 | call_id | A | 23067 | NULL | NULL | | BTREE | | | +-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
ノード4:インデックスが異なっている理由
+-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | users_calls | 0 | PRIMARY | 1 | user_call_id | A | 2091476 | NULL | NULL | | BTREE | | | | users_calls | 1 | call_group_id | 1 | call_group_id | A | 26813 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_call_begin_date | 1 | user_call_begin_date | A | 1045738 | NULL | NULL | YES | BTREE | | | | users_calls | 1 | user_call_begin_date | 2 | user_call_end_date | A | 2091476 | NULL | NULL | YES | BTREE | | | | users_calls | 1 | user_call_id | 1 | user_call_id | A | 2091476 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_call_id | 2 | user_id | A | 2091476 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 1 | user_id | A | 53627 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 2 | call_id | A | 2091476 | NULL | NULL | | BTREE | | | | users_calls | 1 | user_id | 3 | user_call_status | A | 2091476 | NULL | NULL | | BTREE | | | | users_calls | 1 | fk_users_calls_calls | 1 | call_id | A | 15608 | NULL | NULL | | BTREE | | | +-----------------+------------+----------------------+--------------+----------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
私の最初の質問ですので、私は、インデックスをチェックしますか?両方が同じクラスタの権利のために同じである必要がありますか?
なぜ実行計画が異なるのですか?両方とも同じクラスタにあるので、同じにする必要があります
FORCE INDEX
またはSTRAIGHT_JOIN
を使用しますか?
'user_calls_activities'のインデックスは何ですか、' is_validated_with'がそのテーブルにあるようです。 –