http://www.cyberciti.biz/tips This is a Linux sys admin journal by Vivek about sys admin work, Linux tips & tricks, hacks, news and more. Fri, 03 Feb 2012 22:45:35 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://www.cyberciti.biz/tips/move-mysql-users-privileges-grants-from-one-host-to-new-host.html http://www.cyberciti.biz/tips/move-mysql-users-privileges-grants-from-one-host-to-new-host.html#comments Tue, 13 Jul 2010 22:06:53 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=7149 I already wrote about how to move or migrate user accounts from old Linux / UNIX server to a new server including mails and home directories. However, in reality you also need to move MySQL database which may host your blog, forum or just your data stored in MySQL database. The mysqldump command will only export the data and the table structure but it will not include a users grants and privileges. The main function of the MySQL privilege system (which is stored in mysql.user table) is to authenticate a user who connects from a given host and to associate that user with privileges on a database such as SELECT, INSERT, UPDATE, and DELETE.]]> http://www.cyberciti.biz/tips/move-mysql-users-privileges-grants-from-one-host-to-new-host.html/feed 12 http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html#comments Wed, 20 May 2009 07:59:39 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=4773 Applications that perform a lot of memory accesses (several GBs) may obtain performance improvements by using large pages due to reduced Translation Lookaside Buffer (TLB) misses. HugeTLBfs is memory management feature offered in Linux kernel, which is valuable for applications that use a large virtual address space. It is especially useful for database applications such as MySQL, Oracle and others. Other server software(s) that uses the prefork or similar (e.g. Apache web server) model will also benefit.

The CPU's Translation Lookaside Buffer (TLB) is a small cache used for storing virtual-to-physical mapping information. By using the TLB, a translation can be performed without referencing the in-memory page table entry that maps the virtual address. However, to keep translations as fast as possible, the TLB is usually small. It is not uncommon for large memory applications to exceed the mapping capacity of the TLB. Users can use the huge page support in Linux kernel by either using the mmap system call or standard SYSv shared memory system calls (shmget, shmat). ]]> http://www.cyberciti.biz/tips/linux-hugetlbfs-and-mysql-performance.html/feed 10 http://www.cyberciti.biz/tips/oracle-to-purchase-sun-microsystems-for-74b.html http://www.cyberciti.biz/tips/oracle-to-purchase-sun-microsystems-for-74b.html#comments Tue, 21 Apr 2009 10:10:39 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=4622 Look like combined company will give a tough time to both IBM and HP. Sun Microsystems and Oracle Corporation announced yesterday that they have entered into a definitive agreement under which Oracle will acquire Sun common stock for a total of $7.4 billion or $5.6 billion net of Sun's cash and debt.]]> http://www.cyberciti.biz/tips/oracle-to-purchase-sun-microsystems-for-74b.html/feed 3 http://www.cyberciti.biz/tips/howto-build-twitter-like-microblogging-website.html http://www.cyberciti.biz/tips/howto-build-twitter-like-microblogging-website.html#comments Thu, 18 Dec 2008 15:20:02 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=4031 Twitter is a free social networking and micro-blogging service, that allows its users to send and read other users' updates (also known as tweets). Now, you can build your own Twitter like service using trillr1.]]> http://www.cyberciti.biz/tips/howto-build-twitter-like-microblogging-website.html/feed 7 http://www.cyberciti.biz/tips/mysql-vs-postgresql.html http://www.cyberciti.biz/tips/mysql-vs-postgresql.html#comments Thu, 09 Oct 2008 13:02:16 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=3073 Useful comparison of MySQL and PostgreSQL open source database software. MySQL vs PostgreSQL is a decision many must make when approaching open-source relational databases management systems. Both are time-proven solutions that compete strongly with propriety database software.]]> http://www.cyberciti.biz/tips/mysql-vs-postgresql.html/feed 0 http://www.cyberciti.biz/tips/download-wordpress-26.html http://www.cyberciti.biz/tips/download-wordpress-26.html#comments Tue, 15 Jul 2008 09:48:36 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2461 http://www.cyberciti.biz/tips/download-wordpress-26.html/feed 1 http://www.cyberciti.biz/tips/firefox-new-guinness-world-record.html http://www.cyberciti.biz/tips/firefox-new-guinness-world-record.html#comments Thu, 03 Jul 2008 06:28:05 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2432 http://www.cyberciti.biz/tips/firefox-new-guinness-world-record.html/feed 0 http://www.cyberciti.biz/tips/firefox-3-was-download-8-million-times.html http://www.cyberciti.biz/tips/firefox-3-was-download-8-million-times.html#comments Wed, 18 Jun 2008 20:47:18 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2382 http://www.cyberciti.biz/tips/firefox-3-was-download-8-million-times.html/feed 1 http://www.cyberciti.biz/tips/mysql-51.html http://www.cyberciti.biz/tips/mysql-51.html#comments Sat, 19 Apr 2008 10:29:25 +0000 Vivek Gite http://www.cyberciti.biz/tips/?p=2216 http://www.cyberciti.biz/tips/mysql-51.html/feed 0 http://www.cyberciti.biz/tips/linux-unix-setting-up-mysql-database-quotas.html http://www.cyberciti.biz/tips/linux-unix-setting-up-mysql-database-quotas.html#comments Mon, 28 Jan 2008 06:44:32 +0000 Vivek Gite http://www.cyberciti.biz/tips/linux-unix-setting-up-mysql-database-quotas.html http://www.cyberciti.biz/tips/linux-unix-setting-up-mysql-database-quotas.html/feed 5 http://www.cyberciti.biz/tips/sun-to-acquire-mysql-open-source-database.html http://www.cyberciti.biz/tips/sun-to-acquire-mysql-open-source-database.html#comments Wed, 16 Jan 2008 13:49:23 +0000 Vivek Gite http://www.cyberciti.biz/tips/sun-to-acquire-mysql-open-source-database.html http://www.cyberciti.biz/tips/sun-to-acquire-mysql-open-source-database.html/feed 2 http://www.cyberciti.biz/tips/linux-mp3-file-server.html http://www.cyberciti.biz/tips/linux-mp3-file-server.html#comments Fri, 21 Dec 2007 13:06:11 +0000 Vivek Gite http://www.cyberciti.biz/tips/linux-mp3-file-server.html http://www.cyberciti.biz/tips/linux-mp3-file-server.html/feed 0 http://www.cyberciti.biz/tips/download-phpbb-3.html http://www.cyberciti.biz/tips/download-phpbb-3.html#comments Thu, 13 Dec 2007 19:56:21 +0000 Vivek Gite http://www.cyberciti.biz/tips/download-phpbb-3.html phpBB final version 3 has been released and available for download. phpBB is a popular Internet forum package written in the PHP programming language.]]> http://www.cyberciti.biz/tips/download-phpbb-3.html/feed 5 http://www.cyberciti.biz/tips/centos-rhel-lighttpd-chroot-jail-installation-howto.html http://www.cyberciti.biz/tips/centos-rhel-lighttpd-chroot-jail-installation-howto.html#comments Fri, 02 Nov 2007 10:40:53 +0000 Vivek Gite http://www.cyberciti.biz/tips/centos-rhel-lighttpd-chroot-jail-installation-howto.html Many people asked me to write about setting up Lighttpd under CentOS or RHEL 5 Linux using chroot() call. The instructions are almost same but you need to make little modification as compare to Debian / Ubuntu Linux instructions.]]> http://www.cyberciti.biz/tips/centos-rhel-lighttpd-chroot-jail-installation-howto.html/feed 10 http://www.cyberciti.biz/tips/backup-print-wordpress-blog.html http://www.cyberciti.biz/tips/backup-print-wordpress-blog.html#comments Thu, 01 Nov 2007 15:18:07 +0000 Vivek Gite http://www.cyberciti.biz/tips/backup-print-wordpress-blog.html http://www.cyberciti.biz/tips/backup-print-wordpress-blog.html/feed 0 http://www.cyberciti.biz/tips/backup-postgres-mysql-securely-using-ssh.html http://www.cyberciti.biz/tips/backup-postgres-mysql-securely-using-ssh.html#comments Mon, 01 Oct 2007 04:11:53 +0000 Vivek Gite http://www.cyberciti.biz/tips/backup-postgres-mysql-securely-using-ssh.html http://www.cyberciti.biz/tips/backup-postgres-mysql-securely-using-ssh.html/feed 4 http://www.cyberciti.biz/tips/zfs-snapshot-based-mysql-database-backup.html http://www.cyberciti.biz/tips/zfs-snapshot-based-mysql-database-backup.html#comments Mon, 20 Aug 2007 20:49:54 +0000 Vivek Gite http://www.cyberciti.biz/tips/zfs-snapshot-based-mysql-database-backup.html http://www.cyberciti.biz/tips/zfs-snapshot-based-mysql-database-backup.html/feed 0 http://www.cyberciti.biz/tips/mysql-proxy-howto.html http://www.cyberciti.biz/tips/mysql-proxy-howto.html#comments Fri, 10 Aug 2007 15:25:21 +0000 Vivek Gite http://www.cyberciti.biz/tips/mysql-proxy-howto.html http://www.cyberciti.biz/tips/mysql-proxy-howto.html/feed 6 http://www.cyberciti.biz/tips/mysql-on-windows.html http://www.cyberciti.biz/tips/mysql-on-windows.html#comments Mon, 25 Jun 2007 18:25:14 +0000 Vivek Gite http://www.cyberciti.biz/tips/mysql-on-windows.html http://www.cyberciti.biz/tips/mysql-on-windows.html/feed 9 http://www.cyberciti.biz/tips/php-perl-mysql-webprogramming-tutorials.html http://www.cyberciti.biz/tips/php-perl-mysql-webprogramming-tutorials.html#comments Wed, 06 Jun 2007 07:46:27 +0000 Vivek Gite http://www.cyberciti.biz/tips/php-perl-mysql-webprogramming-tutorials.html http://www.cyberciti.biz/tips/php-perl-mysql-webprogramming-tutorials.html/feed 2