umebiusさん
ご返答ありがとうございます。

下記ログを抜粋してみました。
エラーがこのあとも数分おきに出ている状態です。

[2019-11-01 09:14:22,611967] eccube.INFO [918deaaf] [26dc860a] [NULL] [LogListener:logResponse:96] - < 500 [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:115, Doctrine\\DBAL\\Driver\\PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:93, PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:91)"} [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine (uncaught exception) at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 115 {"exception":"[object] (Doctrine\\DBAL\\Exception\\DriverException(code: 0): An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, \"homepage\"]:
[2019-11-01 09:14:22,551884] eccube.CRITICAL [918deaaf] [26dc860a] [NULL] [LogListener:logException:112] - Doctrine\DBAL\Exception\DriverException: An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, "homepage"]:
[2019-11-01 09:14:22,503326] eccube.INFO [918deaaf] [26dc860a] [NULL] [LogListener:logRequest:83] - > GET /cp-bin/eccube3/html/ [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362]
[2019-11-01 09:14:22,502452] eccube.INFO [NULL] [26dc860a] [NULL] [AnonymousAuthenticationListener:handle:62] - Populated the TokenStorage with an anonymous Token. [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362]
[2019-11-01 09:14:22,500778] eccube.INFO [NULL] [26dc860a] [NULL] [RouterListener:onKernelRequest:146] - Matched route "homepage". {"route_parameters":{"_controller":"\\Eccube\\Controller\\TopController::index","_route":"homepage"},"request_uri":"https://oct888.com/cp-bin/eccube3/html/"} [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362]
[2019-11-01 09:14:04,134855] eccube.INFO [b7939c8f] [b9d79d3d] [NULL] [LogListener:logResponse:96] - < 500 [GET, /cp-bin/eccube3/html/products/detail/3, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:115, Doctrine\\DBAL\\Driver\\PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:93, PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:91)"} [GET, /cp-bin/eccube3/html/products/detail/3, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine (uncaught exception) at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 115 {"exception":"[object] (Doctrine\\DBAL\\Exception\\DriverException(code: 0): An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, \"product_detail\"]:
[2019-11-01 09:14:04,107006] eccube.CRITICAL [b7939c8f] [b9d79d3d] [NULL] [LogListener:logException:112] - Doctrine\DBAL\Exception\DriverException: An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, "product_detail"]:
[2019-11-01 09:14:04,058723] eccube.INFO [b7939c8f] [b9d79d3d] [NULL] [LogListener:logRequest:83] - > GET /cp-bin/eccube3/html/products/detail/3 [GET, /cp-bin/eccube3/html/products/detail/3, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
[2019-11-01 09:14:04,058068] eccube.INFO [b7939c8f] [b9d79d3d] [NULL] [AnonymousAuthenticationListener:handle:62] - Populated the TokenStorage with an anonymous Token. [GET, /cp-bin/eccube3/html/products/detail/3, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
[2019-11-01 09:14:04,056668] eccube.INFO [NULL] [b9d79d3d] [NULL] [RouterListener:onKernelRequest:146] - Matched route "product_detail". {"route_parameters":{"_controller":"\\Eccube\\Controller\\ProductController::detail","id":"3","_route":"product_detail"},"request_uri":"https://oct888.com/cp-bin/eccube3/html/products/detail/3"} [GET, /cp-bin/eccube3/html/products/detail/3, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
[2019-11-01 09:13:52,095384] eccube.INFO [b7939c8f] [7d94fee2] [NULL] [LogListener:logResponse:96] - < 500 [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:115, Doctrine\\DBAL\\Driver\\PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:93, PDOException(code: HY000): SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:91)"} [GET, /cp-bin/eccube3/html/, 133.218.45.20, NULL, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36]
SQLSTATE[HY000]: General error: 1030 Got error 28 from storage engine (uncaught exception) at /home/1906341103/oct888-com/public_html/cp-bin/eccube3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 115 {"exception":"[object] (Doctrine\\DBAL\\Exception\\DriverException(code: 0): An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, \"homepage\"]:
[2019-11-01 09:13:52,028720] eccube.CRITICAL [b7939c8f] [7d94fee2] [NULL] [LogListener:logException:112] - Doctrine\DBAL\Exception\DriverException: An exception occurred while executing 'SELECT d0_.page_id AS page_id0, d0_.page_name AS page_name1, d0_.url AS url2, d0_.file_name AS file_name3, d0_.edit_flg AS edit_flg4, d0_.author AS author5, d0_.description AS description6, d0_.keyword AS keyword7, d0_.update_url AS update_url8, d0_.create_date AS create_date9, d0_.update_date AS update_date10, d0_.meta_robots AS meta_robots11, d0_.meta_tags AS meta_tags12, d1_.page_id AS page_id13, d1_.target_id AS target_id14, d1_.block_id AS block_id15, d1_.block_row AS block_row16, d1_.anywhere AS anywhere17, d2_.block_id AS block_id18, d2_.block_name AS block_name19, d2_.file_name AS file_name20, d2_.create_date AS create_date21, d2_.update_date AS update_date22, d2_.logic_flg AS logic_flg23, d2_.deletable_flg AS deletable_flg24, d0_.device_type_id AS device_type_id25, d1_.block_id AS block_id26, d1_.page_id AS page_id27, d2_.device_type_id AS device_type_id28 FROM dtb_page_layout d0_ LEFT JOIN dtb_block_position d1_ ON d0_.page_id = d1_.page_id AND (d0_.page_id = d1_.page_id) LEFT JOIN dtb_block d2_ ON d1_.block_id = d2_.block_id WHERE d0_.device_type_id = ? AND d0_.url = ? ORDER BY d1_.target_id ASC, d1_.block_row ASC' with params [10, "homepage"]: