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  1. Understanding JDBC Internals & Timeout Configuration

    Written by Woon Duk Kang on 06/07/2017   An application with a proper JDBC timeout can cut down the failure time. In this article, we would like to talk about different kinds of timeout values and recommended timeout application methods when you import values from DBMS. Web Application Server became unresponsive after a DDoS attack one day (This is a close reconstitution of an actual event.) The entire service did not work normally after a DDoS attack. The network was disconnected because L4 was not working, which caused WAS to be inoperable as well. Shortly afterward, the security team blocked all DDoS attacks and restored the network back to normal. Yet, WAS was still not working. Through the ThreadDump of WAS, the service team was able to confirm that WAS had stopped during API call from...
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  2. TDE (Transparent Data Encryption) in CUBRID 11

    Written by Jiwon Kim on 07/07/2021 👍Increase the level of database security by utilizing various security features of CUBRID. CUBRID 11 has enhanced security by providing the Transparent Data Encryption (henceforth, TDE) feature. So, what is TDE? TDE means transparently encrypting data from the user’s point of view. This allows users to encrypt data stored on disk with little to no application change. When a hacker hacks into an organization, the number one thing they want to steal is the important data in the database. Alternatively, there may be a situation where an employee with malicious intention inside the company logs into the database and moves all data to a storage media such as a USB.  The easiest way to protect data in these situations is to encrypt the database. TDE, a technolog...
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  3. Preventing Sniffing by CUBRID- Packet Encryption

      Written by Youngjin Hwang on 05/11/2021   Nowadays, browsing the internet with PCs or our smartphones has become an essential part of our daily life. As a result, it is possible to peek into the data being transmitted over the Internet with malicious intent. In other words, being able to peek at the data being transmitted by someone is called sniffing.   A classic example of a sniffing attack would be intercepting the account’s id and password and causing physical damage by using the personal information of others.   To protect our database user data, CUBRID 11.0 has enhanced security by providing packet encryption (and TDE (Transparent Data Encryption) based data encryption, but that will be cover in another blog later). When packet encryption is applied, the packet is encrypted and tran...
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  4. Our Experience of Creating Large Scale Log Search System Using ElasticSearch

    Written by Lee Jae Ik on 05/01/2018 At NHN, we have a service called NELO (NHN Error Log System) to manage and search logs pushed to the system by various applications and other Web services. The search performance and functionality of NELO2, the second generation of the system, have significantly been improved through ElasticSearch. Today I would like to share our experience at NHN in deploying ElasticSearch in Log Search Systems. ElasticSearch is a distributed search engine based on Lucene developed by Shay Banon. Shay and his team have recently released the long-awaited version 0.90. Here is a link to a one-hour recorded webinar where Clinton Gormley, one of the core ElasticSearch developers, explains what's new in ElasticSearch 0.90. If you are developing a system which requires a searc...
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  5. Converting PL/SQL to CUBRID Java SP using ANTLR and StringTemplate

    Written by Youngjin Joo on 09/30/2021 CUBRID DBMS (hereinafter 'CUBRID') does not support PL/SQL. If you want to continue your project by creating functions or subprograms with PL/SQL syntax in CUBRID, you need to convert them to Java Stored Function/Procedure (hereinafter 'Java SP'). Database developers, administrators, and engineers are often familiar with PL/SQL syntax but not with programming languages. In addition, application development depends very little on the DBMS used, but converting PL/SQL to Java SP seems difficult because it feels like you're developing a new system. Therefore, while I am looking for an easy way to convert PL/SQL to Java SP, I found out about ANTLR. ANTLR is a tool for generating parsers. With the help of contributors around the world, ANT...
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