我有一个表格，其中包含来自SaaS产品（我工作的公司）的用户活动，此表格为public class btnRunBackup {
private String s;
public void checkStatus() {
String s, path = null;
Process p;
try{//try1
//create a temp file named tempfilexxx.tmp
File temp = File.createTempFile("tempfile", ".tmp");
//get file path
path = temp.getAbsolutePath();
System.out.println("checkStatus: " + path);
//write to tempfilexxx.tmp
BufferedWriter bw = new BufferedWriter(new FileWriter(temp));
try{// try2
//set p = to the content of ls home
p = Runtime.getRuntime().exec("ls /home | grep ariel");
BufferedReader br = new BufferedReader(
new InputStreamReader(p.getInputStream()));
//write content of p to tempfilexxx.tmp line by line
while ((s = br.readLine()) != null)
bw.write(s + "\n");
//close BufferedReader
br.close();
}catch (Exception e){} //END OF try2
//close BufferedWriter
bw.close();
/*
Now that we ran the 'mt -f /dev/nst0 status command under home we
will filter for one of the following strings
(for testing we will use ls -la /home and filter for ariel)
We will do this by calling the checkStatus method
*/
this.statusControl(path);
}catch(IOException e){
e.printStackTrace();
}// END OF try1
}// END OF listDir
//throws FileNotFoundException for bufferedReader if file not found
public void statusControl(String param) throws FileNotFoundException, IOException{
/*
On production code there will be 4 possible conditions:
1. ONLINE - ready to write (currently we will use ariel)
2. DR_OPEN - no tape available
3. /dev/nst0: Device or resource busy - resource bussy
4. If other than stated above give error 1000
*/
System.out.println("statusControl: " + param);
String ONLINE = "arielvz",
OPEN = "DR_OPEN",
BUSSY = "Device or resource busy",
sCurrentLine;
//Scan file line by line for one of the above options
BufferedReader br = new BufferedReader(new FileReader(param));
while ((sCurrentLine = br.readLine()) != null){
//Tape is online and ready for writing
if (sCurrentLine.contains(ONLINE)){
System.out.println("found ariel");
}
//There is no tape in the tape drive
else if (sCurrentLine.contains(OPEN)){
//lblRunBck should tell the user to put a tape in the drive
System.out.println("No tap in tape drive");
}
else if (sCurrentLine.contains(BUSSY)){
//lblRunBck should notify user that the resource is in use
System.out.println("Device or resource bussy");
}
else{
//Something unexpected happend
System.out.println("Error 1001: Please notify Administrator");
}
}
}//END OF statusControl
public String returnHandler(String param){
return param;
}
}
，并且确实有大约4700行。
我制作的每份报告大约需要2小时才能运行，是否有relational SQL的任何方法可以帮助我改进它的执行时间？目前，我们正在Big Data托管PostgreSQL 9.5。我正在考虑关于AWS的一些事情但不知道这是否是最佳或更好的方式。
表格结构如下：
Amazon Redshift