select created,updated,
trunc((86400*(updated-created ))/60)
from MYTABLE where and trunc((86400*(updated-created ))/60)>10

public String computeHmac(String baseString, String key)     throws NoSuchAlgorithmException, InvalidKeyException, IllegalStateException, UnsupportedEncodingException {     Mac mac = Mac.getInstance("HmacSHA1");     SecretKeySpec secret = new SecretKeySpec(key.getBytes(), mac.getAlgorithm());     mac.init(secret);     byte[] digest = mac.doFinal(baseString.getBytes());     return Base64.encode(digest); }
or

MessageDigest digest = MessageDigest.getInstance("SHA-1");
			digest.reset();
			byte[] hash = digest.digest(body.getBytes("UTF-8"));
			String encodedHash = Base64.encode(hash);

• > 200 request per minutes
• 20 persistent connection <- I used OJB framework, now it is in the ATTIC
• 99.9% MySQL CPU
• 150Kb/s traffic to MySQL
• I panic
• MySQL 5.1.35 running on Redhat Linux Release 9 (Shrike)
• No my.cnf , running on default installation

http://superuser.com/questions/73979/how-to-easily-create-a-ssl-certificate-and-configure-it-in-apache2-in-mac-os-x

Question:

I’d like to use my Mac OS X with https for local development tests. How can I easily make Apache2 respond to ssl, just for test proposes – I don’t want a real certificate, just a fake to make local https work ?

Answer:

Generating the private key:

output:

enter a passphrase for your private key.
Generating the CSR (certificate signing request):

It will request details like this:

it’s fairly straightforward, the common name is your server’s hostname as it says in brackets.

Generating the self signed certificate:

Configuring SSL in httpd.conf for Apache:

(replace path appropriately with the path to your certificate and key)

Restart Apache:

Apache will ask you for the passphrase to your key. If you think you will be shutting the server down a lot, you may want to remove the passphrase from the key so you can avoid entering it each time. If not, don’t worry about it. If so, complete this step after step 2 (Generating the CSR):

select 	nvl(ss.USERNAME,'ORACLE PROC') username,
	se.SID,ss.logon_time,
	VALUE cpu_usage,osuser
from 	v$session ss,
	v$sesstat se,
	v$statname sn
where  	se.STATISTIC# = sn.STATISTIC#
and  	NAME like '%CPU used by this session%'
and  	se.SID = ss.SID
order  	by VALUE desc
------------------
SELECT s.sid, p.spid "OS Pid", s.module, s.process, s.schemaname "Schema", s.username "Username",
s.osuser "OS User", s.program "Program", substr(a.sql_text,1,550) "SQL Text"
FROM v$session s, v$sqlarea a, v$process p
WHERE s.sql_hash_value = a.hash_value (+)
AND s.sql_address = a.address (+)
AND s.paddr = p.addr
and nvl(a.sql_text,'-')!='-'
--and s.sid in (418)
and p.spid in (<your OS process id on the db server by running command prstat>)

http://www.techrepublic.com/article/handling-large-data-files-efficiently-with-java/1046714
/**
   *  Reads a file storing intermediate data into a list. Fast method.
   *  @param file the file to be read
   *  @return a file data
   */
   public byte[] read2list(String file) throws Exception {
      InputStream in = null;
      byte[] buf             = null; // output buffer
      int    bufLen          = 20000*1024;
      try{
         in = new BufferedInputStream(new FileInputStream(file));
         buf = new byte[bufLen];
         byte[] tmp = null;
         int len    = 0;
         List data  = new ArrayList(24); // keeps peaces of data
         while((len = in.read(buf,0,bufLen)) != -1){
            tmp = new byte[len];
            System.arraycopy(buf,0,tmp,0,len); // still need to do copy
            data.add(tmp);
         }
         /*
            This part os optional. This method could return a List data
            for further processing, etc.
         */
         len = 0;
         if (data.size() == 1) return (byte[]) data.get(0);
         for (int i=0;i<data.size();i++) len += ((byte[]) data.get(i)).length;
         buf = new byte[len]; // final output buffer
         len = 0;
         for (int i=0;i<data.size();i++){ // fill with data
           tmp = (byte[]) data.get(i);
            System.arraycopy(tmp,0,buf,len,tmp.length);
            len += tmp.length;
         }
      }finally{
         if (in != null) try{ in.close();}catch (Exception e){}
      }
      return buf;
   }

http://code.hammerpig.com/how-to-read-really-large-files-in-java.html

import java.util.*;
import java.io.*;

public class BigFile implements Iterable<String>
{
    private BufferedReader _reader;

    public BigFile(String filePath) throws Exception
    {
	_reader = new BufferedReader(new FileReader(filePath));
    }

    public void Close()
    {
	try
	{
	    _reader.close();
	}
	catch (Exception ex) {}
    }

    public Iterator<String> iterator()
    {
	return new FileIterator();
    }

    private class FileIterator implements Iterator<String>
    {
	private String _currentLine;

	public boolean hasNext()
	{
	    try
	    {
		_currentLine = _reader.readLine();
	    }
	    catch (Exception ex)
	    {
		_currentLine = null;
		ex.printStackTrace();
	    }

	    return _currentLine != null;
	}

	public String next()
	{
	    return _currentLine;
	}

	public void remove()
	{
	}
    }
}

BigFile file = new BigFile("C:\Temp\BigFile.txt");

for (String line : file)
    System.out.println(line)