3

約500万行を含むデータベースがあり、クエリに長い時間（1分以上）かかる問題が発生しています。この情報で誰かが私にいくつかの提案をしてくれることを望んでいました。もっと情報を投稿する必要がある場合は、私に知らせてください。

アドバイスありがとうございます

EXPLAIN SELECT count( * ) AS count
FROM vtiger_time
INNER JOIN vtiger_crmentity ON vtiger_crmentity.crmid = vtiger_time.timeid
INNER JOIN vtiger_crmentityrel ON ( vtiger_crmentityrel.relcrmid = vtiger_crmentity.crmid
OR vtiger_crmentityrel.crmid = vtiger_crmentity.crmid )
LEFT JOIN vtiger_users ON vtiger_users.id = vtiger_crmentity.smownerid
LEFT JOIN vtiger_groups ON vtiger_groups.groupid = vtiger_crmentity.smownerid
WHERE vtiger_crmentity.deleted =0
AND (
    vtiger_crmentityrel.crmid =211294
    OR vtiger_crmentityrel.relcrmid =211294
)


+----+-------------+---------------------+-------------+-------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+
| id | select_type | table               | type        | possible_keys                                   | key            | key_len | ref                            | rows  | Extra                                    |
+----+-------------+---------------------+-------------+-------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+
|  1 | SIMPLE      | vtiger_crmentityrel | index_merge | crmid,relcrmid                                  | crmid,relcrmid | 4,4     | NULL                           |  5881 | Using union(crmid,relcrmid); Using where | 
|  1 | SIMPLE      | vtiger_crmentity    | ref         | PRIMARY,deleted,deleted_2,crmentity_multi_index | deleted_2      | 4       | const                          | 84424 | Using where; Using index                 | 
|  1 | SIMPLE      | vtiger_users        | eq_ref      | PRIMARY                                         | PRIMARY        | 4       | crm.vtiger_crmentity.smownerid |     1 | Using index                              | 
|  1 | SIMPLE      | vtiger_groups       | eq_ref      | PRIMARY                                         | PRIMARY        | 4       | crm.vtiger_crmentity.smownerid |     1 | Using index                              | 
|  1 | SIMPLE      | vtiger_time      | eq_ref      | PRIMARY,timeid                               | PRIMARY        | 4       | crm.vtiger_crmentity.crmid     |     1 | Using index                              | 
+----+-------------+---------------------+-------------+-------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+

さらに、これらは私の現在設定されているインデックスです 

+------------------+------------+----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table            | Non_unique | Key_name                   | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+------------------+------------+----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_crmentity |          0 | PRIMARY                    |            1 | crmid       | A         |      755968 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          0 | crmid                      |            1 | crmid       | A         |      755968 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_IDX0             |            1 | smcreatorid | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_IDX1             |            1 | smownerid   | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_IDX2             |            1 | modifiedby  | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | deleted                    |            1 | deleted     | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | deleted                    |            2 | smownerid   | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | smownerid                  |            1 | smownerid   | A         |         199 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | smownerid                  |            2 | deleted     | A         |         199 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | deleted_2                  |            1 | deleted     | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | deleted_2                  |            2 | smownerid   | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | smownerid_2                |            1 | smownerid   | A         |         385 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | smownerid_2                |            2 | deleted     | A         |         758 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crm_ownerid_del_setype_idx |            1 | smownerid   | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crm_ownerid_del_setype_idx |            2 | deleted     | A         |          15 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crm_ownerid_del_setype_idx |            3 | setype      | A         |         613 |     NULL | NULL   | YES  | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_multi_index      |            1 | crmid       | A         |      755968 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_multi_index      |            2 | smownerid   | A         |      755968 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentity |          1 | crmentity_multi_index      |            3 | deleted     | A         |      755968 |     NULL | NULL   |      | BTREE      |         | 
+------------------+------------+----------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+

+---------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table               | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+---------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_crmentityrel |          1 | crmid    |            1 | crmid       | A         |      223960 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_crmentityrel |          1 | relcrmid |            1 | relcrmid    | A         |       12442 |     NULL | NULL   |      | BTREE      |         | 
+---------------------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+

+--------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+
| Table        | Non_unique | Key_name      | Seq_in_index | Column_name   | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+--------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_users |          0 | PRIMARY       |            1 | id            | A         |          39 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_users |          1 | idx_user_name |            1 | user_name     | A         |          39 |     NULL | NULL   | YES  | BTREE      |         | 
| vtiger_users |          1 | user_password |            1 | user_password | A         |          39 |     NULL | NULL   | YES  | BTREE      |         | 
+--------------+------------+---------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+

+---------------+------------+---------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table         | Non_unique | Key_name            | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+---------------+------------+---------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_groups |          0 | PRIMARY             |            1 | groupid     | A         |           5 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_groups |          1 | groupname           |            1 | groupname   | A         |           5 |     NULL | NULL   | YES  | BTREE      |         | 
| vtiger_groups |          1 | idx_groups_123group |            1 | groupname   | A         |           5 |     NULL | NULL   | YES  | BTREE      |         | 
+---------------+------------+---------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+

+----------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table          | Non_unique | Key_name    | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+----------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_time |          0 | PRIMARY     |            1 | timeid   | A         |      591772 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_time |          0 | timeid   |            1 | timeid   | A         |      591772 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_time |          1 | relatedto   |            1 | relatedto   | A         |        1405 |     NULL | NULL   | YES  | BTREE      |         | 
| vtiger_time |          1 | date_start  |            1 | date_start  | A         |        7129 |     NULL | NULL   | YES  | BTREE      |         | 
| vtiger_time |          1 | relatedto_2 |            1 | relatedto   | A         |        3269 |     NULL | NULL   | YES  | BTREE      |         | 
+----------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+

+------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table            | Non_unique | Key_name    | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| vtiger_timecf |          0 | PRIMARY     |            1 | timeid   | A         |      591324 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_timecf |          0 | timeid   |            1 | timeid   | A         |      591324 |     NULL | NULL   |      | BTREE      |         | 
| vtiger_timecf |          1 | timeid_2 |            1 | timeid   | A         |      591324 |     NULL | NULL   |      | BTREE      |         | 
+------------------+------------+-------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+

次のインデックスを追加した後

ALTER TABLE vtiger_crmentity ADD INDEX TMP_deletion_smownerid_crmid (smownerid, deleted,crmid);

新しい説明：

+----+-------------+---------------------+-------------+--------------------------------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+
| id | select_type | table               | type        | possible_keys                                                            | key            | key_len | ref                            | rows  | Extra                                    |
+----+-------------+---------------------+-------------+--------------------------------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+
|  1 | SIMPLE      | vtiger_crmentityrel | index_merge | crmid,relcrmid                                                           | crmid,relcrmid | 4,4     | NULL                           |  5891 | Using union(crmid,relcrmid); Using where | 
|  1 | SIMPLE      | vtiger_crmentity    | ref         | PRIMARY,crmid,deleted,deleted_2,crmentity_multi_index,_deletion_crmid | deleted        | 4       | const                          | 84424 | Using where; Using index                 | 
|  1 | SIMPLE      | vtiger_users        | eq_ref      | PRIMARY                                                                  | PRIMARY        | 4       | crm.vtiger_crmentity.smownerid |     1 | Using index                              | 
|  1 | SIMPLE      | vtiger_groups       | eq_ref      | PRIMARY                                                                  | PRIMARY        | 4       | crm.vtiger_crmentity.smownerid |     1 | Using index                              | 
|  1 | SIMPLE      | vtiger_time      | eq_ref      | PRIMARY,timeid                                                        | PRIMARY        | 4       | crm.vtiger_crmentity.crmid     |     1 | Using index                              | 
+----+-------------+---------------------+-------------+--------------------------------------------------------------------------+----------------+---------+--------------------------------+-------+------------------------------------------+
4

2 に答える 2

1

クエリを書き直すと役に立ちますが、それができないため、 と の複合インデックスが役立つ場合がありvtiger_crmentity.crmidますvtiger_crmentity.deleted。ただし、現在 にあるインデックスの 1 つをvtiger_crmentity.crmid使用していないため、新しいものを使用しない可能性があります。そうでない場合は、インデックスに追加vtiger_crmentity.crmidしてみてください。vtiger_crmentity.deletedで既にインデックスを使用しているvtiger_crmentity.deletedため、これによりインデックスがカバリング インデックスになり、クエリでテーブルから読み取る必要がなくなります。

コメントで述べたように、重複するインデックスがたくさんあります。この質問のクエリには影響しませんが、挿入が遅くなり、テーブルのサイズが大きくなります。次のインデックスは冗長です。

vtiger_crmentity.crmid
vtiger_crmentity.smownerid
vtiger_crmentity.smownerid_2
vtiger_crmentity.deleted_2

vtiger_groups.idx_groups_123group

vtiger_time.timeid
vtiger_time.relatedto_2

vtiger_timecf.timeid
vtiger_timcfe.timeid_2

パスワードでユーザーを探すべきではないため、ユーザーパスワード列のインデックスも必要ありません。

于 2012-11-28T00:35:41.653 に答える
1

このインデックスを追加してみてください:

ALTER TABLE vtiger_crmentityrel ADD INDEX ix_crmentityrel_crmid_relcrmid (crmid,relcrmid);

これにより、explain の最初の行が crmentityrel テーブルの 2 つのインデックスによって完全に満たされるようになり、数千回のルックアップを節約できるはずです。

実行計画の他のすべての部分はカバリング インデックスを使用しているため、これが役に立たない場合は、データまたはクエリを再構築せずにできることはあまりありません。

于 2012-11-28T02:09:57.027 に答える