cnmoro

zRam is a virtual memory compression using block devices named /dev/zram using a fast compression algorithm (LZ4) that compress the least recently used (LRU) or inactive space in the memory allows the GNU/Linux kernel to free up more memory with less performance hit.

zRam is greatly increased the available amount of memory by compressing memory without swap disks/partition. It is recommended for the user to use zRam instead of not use/disable the swap to prevent out of memory (OOM) killer. Create a zRam block devices Load the zRam modules to the kernel using modprobe:

sudo modprobe zram

Set the zRam extremely fast compression algorithm using lz4:

cnmoro

Reference: https://help.ubuntu.com/community/Oracle%20Instant%20Client

Tested on: Ubuntu 18.04, 20.04

1. Decide which version of the Oracle client to install

   • Each version of the client supports certain versions of the database; for example, Oracle client 12.1 supports Oracle database 10.2 - 19c
   • See here for more information: http://support.oracle.com/epmos/faces/DocumentDisplay?id=207303.1

2. Download the Oracle client packages

   • Go here and download the desired RPM package(s): https://www.oracle.com/database/technologies/instant-client/downloads.html

cnmoro

# Install x-related to compile x11vnc from source code.
sudo apt-get update 
sudo apt-get install -y libxtst-dev libssl-dev libjpeg-dev

# Grep source code.
wget http://x11vnc.sourceforge.net/dev/x11vnc-0.9.14-dev.tar.gz
gzip -dc x11vnc-0.9.14-dev.tar.gz | tar -xvf -
cd x11vnc-0.9.14/
./configure --prefix=/usr/local CFLAGS='-g -O2 -fno-stack-protector -Wall'

cnmoro

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class Gzip {