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mysql ビューの使用に大きな問題があります。本当に必要な情報を受け取るためにいくつかのテーブルを結合するビューを生成しています。

私は次の見解を持っています：

CREATE OR REPLACE VIEW view_test AS

SELECT nve_nr.nve_nvenr AS collonr,
CONCAT (adr_emp.adr_name1, "\n", adr_emp.adr_name2, "\n", adr_emp.adr_strasse, "\n", adr_emp.adr_land , " -     ", adr_emp.adr_plz, " ", adr_emp.adr_ort) AS emp_adr,

UNIX_TIMESTAMP((SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 WHERE t_1.colst_nve_id = 
nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76))) AS status_x,

UNIX_TIMESTAMP((SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 WHERE t_2.colst_nve_id = 
nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91))) AS status_y,

UNIX_TIMESTAMP((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104))) AS status_z,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 WHERE t_2.colst_nve_id = 
nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91)), (SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 
WHERE t_1.colst_nve_id = nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76)))) AS timediff_xy,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104)), (SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 
WHERE t_2.colst_nve_id = nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91)))) AS timediff_yz,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104)), (SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 
WHERE t_1.colst_nve_id = nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76)))) AS timediff_xz,

CAST(SUBSTR(nve_nr.nve_nvenr, 1, 3) AS UNSIGNED INTEGER) AS filter_collonr,

(SELECT t_5.colst_status_code FROM tbl_collo_status t_5 WHERE t_5.colst_nve_id=nve_nr.nve_id ORDER BY 
t_5.colst_timestamp DESC LIMIT 1) AS filter_last_status,

sdg.sdg_kunde AS filter_kunden_id,

sdg.sdg_id AS filter_sdg_id,

nve_nr.nve_id AS filter_nve_id,

adr_emp.adr_id AS filter_adr_emp_id

FROM ((tbl_nve_nr nve_nr LEFT JOIN tbl_sendungen sdg ON nve_nr.nve_sdg_id = sdg.sdg_id)

LEFT JOIN tbl_adressen adr_emp ON adr_emp.adr_id = sdg.sdg_adr2_id);

現在、そのビューには 250.000 を超えるデータセットがあり、そのビューで選択を開始すると、結果を受け取るまでに 20 分以上かかります。Explain Select は以下を返します。

//![ビューからの選択の説明][1]

評判が10にならないと画像を投稿できないので、次のようにしてみます。

ビューを高速化するために何ができるか教えてもらえますか? ビューを使用せずにクエリを実行すると、250.000 の利用可能なデータセットから選択する必要がある 25 のデータセットの制限で約 2 分かかります。

//編集:だから私は別の方法で問題を解決しました:)以下に説明する解決策は、SQLクエリが十分に速く動作しないため、次の方法で解決しました:

ビューが不要になったため、ビューを削除します。テーブル nve_nr を変更して、最後のステータスとそのタイムスタンプ用の 2 つのフィールドを追加します。タイムスタンプが既存のものよりも新しい場合、その値を置き換える collo_status でトリガーを作成します。-> したがって、サブクエリが 1 つ少なくなります - 2 分から 60 秒近くにスピードアップします。

インデックスを再構築し、php で直接クエリを実行します -> php のコードが増えますが、はるかに太くなります - 今では 13 秒近くまで高速化されています :)

新しいフィールドでデータベースを更新するには、現在の最新のステータスを見つける手順が含まれます。

したがって、新しいクエリは次のようになります。

SELECT SQL_CALC_FOUND_ROWS 
sdg.sdg_lieferschein AS referenz, 
nve_nr.nve_nvenr AS collonr, 
nve_nr.nve_last_timestamp AS filter_status_time, 
nve_nr.nve_last_status AS filter_last_status, 
sdg.sdg_kunde AS filter_kunden_id, 
sdg.sdg_id AS filter_sdg_id, 
nve_nr.nve_id AS filter_nve_id, 
adr_emp.adr_id AS filter_adr_emp_id, 
adr_emp.adr_name1 AS emp_adr_name1, 
adr_emp.adr_name2 AS emp_adr_name2, 
adr_emp.adr_land AS emp_adr_land, 
adr_emp.adr_plz AS emp_adr_plz, 
adr_emp.adr_ort AS emp_adr_ort,
UNIX_TIMESTAMP(t_1.colst_timestamp) AS status_x, 
t_1.colst_status_code AS status_code_x, 
UNIX_TIMESTAMP(t_2.colst_timestamp) AS status_y, 
t_2.colst_status_code AS status_code_y, 
UNIX_TIMESTAMP(t_3.colst_timestamp) AS status_z, 
t_3.colst_status_code AS status_code_z, 
TIME_TO_SEC(TIMEDIFF(t_2.colst_timestamp, t_1.colst_timestamp)) AS timediff_xy, 
TIME_TO_SEC(TIMEDIFF(t_3.colst_timestamp, t_2.colst_timestamp)) AS timediff_yz, 
TIME_TO_SEC(TIMEDIFF(t_3.colst_timestamp, t_1.colst_timestamp)) AS timediff_xz, 
CAST(SUBSTR(nve_nr.nve_nvenr, 1, 3) AS UNSIGNED INTEGER) AS filter_collonr 
FROM tbl_nve_nr nve_nr 
LEFT JOIN tbl_sendungen sdg 
ON nve_nr.nve_sdg_id = sdg.sdg_id 
LEFT JOIN tbl_adressen adr_emp 
ON (adr_emp.adr_id = sdg.sdg_adr2_id) 
LEFT JOIN tbl_collo_status t_1 
ON (t_1.colst_nve_id = nve_nr.nve_id AND t_1.colst_aktiv = 1 AND t_1.colst_status_code IN (10, 11, 76)) 
LEFT JOIN tbl_collo_status t_2 
ON (t_2.colst_nve_id = nve_nr.nve_id AND t_2.colst_aktiv = 1 AND t_2.colst_status_code IN (20,25,91)) 
LEFT JOIN tbl_collo_status t_3 
ON (t_3.colst_nve_id = nve_nr.nve_id AND t_3.colst_aktiv = 1 AND t_3.colst_status_code IN (30,99,104)) 
GROUP BY collonr 
ORDER BY collonr DESC 
LIMIT 900, 75

//[1]: http://i.stack.imgur.com/TPw6s.png

4

1 に答える 1

1

主な問題はおそらくインデックスですが、co 関連のサブクエリを削除する価値もあります。このようなもの：-

CREATE OR REPLACE VIEW view_test AS

SELECT nve_nr.nve_nvenr AS collonr,
CONCAT (adr_emp.adr_name1, "\n", adr_emp.adr_name2, "\n", adr_emp.adr_strasse, "\n", adr_emp.adr_land , " -     ", adr_emp.adr_plz, " ", adr_emp.adr_ort) AS emp_adr,

UNIX_TIMESTAMP((SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 WHERE t_1.colst_nve_id = 
nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76))) AS status_x,

UNIX_TIMESTAMP((SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 WHERE t_2.colst_nve_id = 
nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91))) AS status_y,

UNIX_TIMESTAMP((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104))) AS status_z,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 WHERE t_2.colst_nve_id = 
nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91)), (SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 
WHERE t_1.colst_nve_id = nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76)))) AS timediff_xy,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104)), (SELECT MAX(t_2.colst_timestamp) FROM tbl_collo_status t_2 
WHERE t_2.colst_nve_id = nve_nr.nve_id AND t_2.colst_status_code IN (20,25,91)))) AS timediff_yz,

TIME_TO_SEC(TIMEDIFF((SELECT MAX(t_3.colst_timestamp) FROM tbl_collo_status t_3 WHERE t_3.colst_nve_id = 
nve_nr.nve_id AND t_3.colst_status_code IN (30,99,104)), (SELECT MAX(t_1.colst_timestamp) FROM tbl_collo_status t_1 
WHERE t_1.colst_nve_id = nve_nr.nve_id AND t_1.colst_status_code IN (10, 11, 76)))) AS timediff_xz,

CAST(SUBSTR(nve_nr.nve_nvenr, 1, 3) AS UNSIGNED INTEGER) AS filter_collonr,

MAX(t_5.colst_status_code) AS filter_last_status,

sdg.sdg_kunde AS filter_kunden_id,

sdg.sdg_id AS filter_sdg_id,

nve_nr.nve_id AS filter_nve_id,

adr_emp.adr_id AS filter_adr_emp_id

FROM tbl_nve_nr nve_nr 

LEFT JOIN tbl_sendungen sdg ON nve_nr.nve_sdg_id = sdg.sdg_id

LEFT JOIN tbl_adressen adr_emp ON adr_emp.adr_id = sdg.sdg_adr2_id

INNER JOIN tbl_collo_status t_5  ON t_5.colst_nve_id = nve_nr.nve_id

GROUP BY collonr, emp_adr, status_x, status_y, status_z, timediff_xy, timediff_yz, timediff_xz, filter_collonr, filter_kunden_id, filter_sdg_id, filter_nve_id, filter_adr_emp_id

問題は、クエリに相互に関連するサブクエリがたくさんあり、これらの一般的にパフォーマンスが悪いことです。

最善の解決策は、相互に関連するすべてのサブクエリを他のビュー (選択を含むビュー) に対する結合に置き換えることです。

編集 - 他のサブセレクトの分割:-

ビューを作成します:-

CREATE ALGORITHM = UNDEFINED VIEW vw_MaxTimeStamp_10_11_76 AS SELECT t_1.colst_nve_id, MAX(t_1.colst_timestamp) AS MaxTimestamp FROM tbl_collo_status t_1 WHERE t_1.colst_status_code IN (10, 11, 76) GROUP BY t_1.colst_nve_id

CREATE ALGORITHM = UNDEFINED VIEW vw_MaxTimeStamp_20_25_91 AS SELECT t_1.colst_nve_id, MAX(t_1.colst_timestamp) AS MaxTimestamp FROM tbl_collo_status t_1 WHERE t_1.colst_status_code IN (20,25,91) GROUP BY t_1.colst_nve_id

CREATE ALGORITHM = UNDEFINED VIEW vw_MaxTimeStamp_30_99_104 AS SELECT t_1.colst_nve_id, MAX(t_1.colst_timestamp) AS MaxTimestamp FROM tbl_collo_status t_1 WHERE t_1.colst_status_code IN (30,99,104) GROUP BY t_1.colst_nve_id

CREATE ALGORITHM = UNDEFINED VIEW vw_MaxStatusCode AS SELECT colst_nve_id, MAX(t_5.colst_status_code) AS MaxStatusCode FROM tbl_collo_status t_5 GROUP BY colst_nve_id

次に、メイン ビューを次のように簡略化できます (テストされていないため、いくつかのタイプミスがある可能性があります)。

CREATE OR REPLACE VIEW view_test AS

SELECT nve_nr.nve_nvenr AS collonr,
CONCAT (adr_emp.adr_name1, "\n", adr_emp.adr_name2, "\n", adr_emp.adr_strasse, "\n", adr_emp.adr_land , " -     ", adr_emp.adr_plz, " ", adr_emp.adr_ort) AS emp_adr,
UNIX_TIMESTAMP(vw_MaxTimeStamp_10_11_76.MaxTimestamp) AS status_x,
UNIX_TIMESTAMP(vw_MaxTimeStamp_20_25_91.MaxTimestamp) AS status_y,
UNIX_TIMESTAMP(vw_MaxTimeStamp_30_99_104.MaxTimestamp) AS status_z,
TIME_TO_SEC(TIMEDIFF(vw_MaxTimeStamp_20_25_91.MaxTimestamp, vw_MaxTimeStamp_10_11_76.MaxTimestamp)) AS timediff_xy,
TIME_TO_SEC(TIMEDIFF(vw_MaxTimeStamp_30_99_104.MaxTimestamp, vw_MaxTimeStamp_20_25_91.MaxTimestamp)) AS timediff_yz,
TIME_TO_SEC(TIMEDIFF(vw_MaxTimeStamp_30_99_104.MaxTimestamp, vw_MaxTimeStamp_10_11_76.MaxTimestamp)) AS timediff_xz,
CAST(SUBSTR(nve_nr.nve_nvenr, 1, 3) AS UNSIGNED INTEGER) AS filter_collonr,
vw_MaxStatusCode.MaxStatusCode AS filter_last_status
sdg.sdg_kunde AS filter_kunden_id,
sdg.sdg_id AS filter_sdg_id,
nve_nr.nve_id AS filter_nve_id,
adr_emp.adr_id AS filter_adr_emp_id
FROM tbl_nve_nr nve_nr 
LEFT JOIN tbl_sendungen sdg ON nve_nr.nve_sdg_id = sdg.sdg_id
LEFT JOIN tbl_adressen adr_emp ON adr_emp.adr_id = sdg.sdg_adr2_id
INNER JOIN tbl_collo_status t_5  ON t_5.colst_nve_id = nve_nr.nve_id
LEFT OUTER JOIN vw_MaxTimeStamp_10_11_76 ON vw_MaxTimeStamp_10_11_76.colst_nve_id = nve_nr.nve_id
LEFT OUTER JOIN vw_MaxTimeStamp_20_25_91 ON vw_MaxTimeStamp_20_25_91.colst_nve_id = nve_nr.nve_id
LEFT OUTER JOIN vw_MaxTimeStamp_30_99_104 ON vw_MaxTimeStamp_30_99_104.colst_nve_id = nve_nr.nve_id
LEFT OUTRER JOIN vw_MaxStatusCode ON vw_MaxStatusCode.colst_nve_id = nve_nr.nve_id
于 2013-07-01T11:23:48.357 に答える