internal RDBMS table X$ : encrypted, sysdba only, fundation of internal mechanism.example: X$KVIT Data dictionary(table) %$ : for storing database structure and definition, created by sql.bsp and $

By v$lock, we could have a look at lock in every session. Lock have a lot of mode: mode|name||desc–|–||–0|none|1|null|2|Row-S||row sharing lock: share row3|Row-X||row exclusive lock: for modify row4

Long time no see! Today I am going to have a very exciting thing:printing under command line in linuxWhich is very useful if you need to do the work very fluently!First install cups and its pdf conver

Add edit file glogin.sql in sqlplus folder.Better than nothing: 12345678910111213141516171819define _editor=vimset serverout on size 100000set trimspool onset long 5000set linesize 100set pagesize 999

Edit /etc/default/locale file: LANG=”en_US.UTF-8″ LANGUAGE=”en_US:en” Then generate locale: $ locale-gen -en_US:en You need log out to make this language activated.

I have been studying clojure for a few days, but I need to write test code in files before using lein run to test it, which is definitely productiveless.One way to load a jar in repl 1(require &#x

Sometimes you just want to partially use columns or fields in HQL but still want to map them into a class by Hibernate.Well I also encounter this situation.I have a entity class Word which has 5 field

For development usage, I would rather allow any connection to postgresql: First you need to add one line in pg_hba.conf host all all 0.0.0.0/0 md5 Which means

When using eclipse on window to connect to remote hadoop server in Linux.But when add a new location: Cannot connect to the Map/Reduce location: Call to 172.18.3.198/172.18.3.198:9001 failed on con

I just find it is difficult to scan Chinese character in Java.For reading UTF-8 chinese character by Scanner, you need to identify the char-set. 1Scanner sc = new Scanner(file, "utf-8");