dashdb：連接錯誤SQLSTATE = 08001

我以dashDB作爲後端運行Node.js應用程序。我使用ibm_db節點包作爲連接到dashDB的驅動程序。 Node.js和dashDB部署在IBM Bluemix中。我沒有使用ibm_db軟件包提供的連接池選項。我們有後臺作業（來自node-cron包的cron作業），它經常查詢dashDB（比如每2分鐘）查詢CRUD操作。前30分鐘，沒有問題。 30-45分鐘後，當我們試圖建立連接時，我們開始低於錯誤。dashdb：連接錯誤SQLSTATE = 08001

只要我們從數據庫中獲得結果，就會打開連接並關閉連接。

這裏是我們用來打開代碼和關閉連接：

var dashDB = require("ibm_db") 
function openConnection(next) { 
    try { 
     dashDB.open(connectionString, function(err, connection) { 
      if (err) return dashDBError('openConnection', err) 
      console.log('DB: openConnection.'.blue) 
      connectionsCount ++ 
      next(connection) 
     }); 
    } catch(err) { 
     console.error('CAUGHT OPEN CONNECTION ERROR') 
     console.log(err) 
     next({ error: err }) 
    } 
} 

//Close dashDB connection 
function closeConnection(connection) { 
    connection.close(function(err) { 
     if (err) return dashDBError('closeConnection', err) 
     connectionsCount -- 
     console.log('DB: closeConnection.'.blue) 
    }) 
} 
//Throw error on exception 
function dashDBError(action, err) { 
    console.error('DB ERROR', action, err.message) 
    console.log('Connections: ', connectionsCount) 
    console.trace("Here I am!") 
    return { error: err } 
}

這裏是我們得到的錯誤：

**[IBM][CLI Driver] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". 
Location where the error was detected: "169.55.227.101". Communication function detecting the error: "send". Protocol specific error code(s): "32", "*", "0". SQLSTATE=08001 

[IBM][CLI Driver] SQL30081N A communication error has been detected. Communication protocol being used: "TCP/IP". Communication API being used: "SOCKETS". 
Location where the error was detected: "169.55.227.101". Communication function detecting the error: "selectForConnectTimeout". Protocol specific error code(s): "115", "*", "*". SQLSTATE=08001 

Assertion failed: (ret != SQL_INVALID_HANDLE), function GetColumnValue, file ../src/odbc.cpp, line 620. 
Abort trap: 6**

來源

2016-09-16 Devaraj Kommineni