[英]phantom reads in InnoDB, MyISAM and other engines
我正在嘗試使用Java和JDBC在MySQL中創建幻像讀取。 我有以下交易
交易1:
String[] querySetOne = new String[5];
querySetOne[0] = "use adventureworks";
querySetOne[1] = "select * from vendorcontact where ContactTypeID between 10 and 30";
querySetOne[2] = "select sleep(20)";
querySetOne[3] = "select * from vendorcontact where ContactTypeID between 10 and 30";
querySetOne[4] = "COMMIT";
交易2:
String[] querySetTwo = new String[4];
querySetTwo[0] = "use adventureworks";
querySetTwo[1] = "select sleep(2)";
querySetTwo[2] = "insert into vendorcontact values (105, 700, 20, NULL)";
querySetTwo[3] = "COMMIT";
我試圖在可重復讀取隔離級別上使用InnoDB數據庫引擎創建幻像讀取,但是我現在的理解是MySQL將快照隔離與REPEATABLE READ和SERIALIZABLE隔離級別結合使用。 然后,我將數據庫引擎切換到MyISAM,發現它沒有任何並發控制。 當我使用MyISAM時,在所有隔離級別上都會丟失更新,不可重復的讀取,臟讀取和幻像。 我有幾個問題:
據我所知MyISAM表忽略隔離級別設置。 它在5.0和5.1文檔中是明確的 ,但似乎已刪除了較新文檔中對InnoDB的提及。
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