Difference Between pfile and spfile in Oracle?

What is the difference between a PFILE and SPFILE:

A PFILE is a static, client-side text file that must be updated with a standard text editor like "notepad" or "vi". This file normally reside on the server, however, you need a local copy if you want to start Oracle from a remote machine. DBA's commonly refer to this file as the INIT.ORA file.

An SPFILE (Server Parameter File), on the other hand, is a persistent server-side binary file that can only be modified with the "ALTER SYSTEM SET" command. This means you no longer need a local copy of the pfile to start the database from a remote machine. Editing an SPFILE will corrupt it, and you will not be able to start your database anymore.

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Background Process in ORACLE Database

Background Process in ORACLE Database Database Writer Process (DBWn) Log Writer Process (LGWR) Checkpoint Process (CKPT) System Monitor Process (SMON) Process Monitor Process (PMON) Recoverer Process (RECO) Job Queue Processes Archiver Processes (ARCn) Queue Monitor Processes (QMNn) Database Writer Process (DBWn) The database writer process (DBWn) writes the contents of buffers to datafiles. The DBWn processes are responsible for writing modified (dirty) buffers in the database buffer cache to disk. Although one database writer process (DBW0) is adequate for most systems, you can configure additional processes (DBW1 through DBW9 and DBWa through DBWj) to improve write performance if your system modifies data heavily. These additional DBWn processes are not useful on uniprocessor systems. When a buffer in the database buffer cache is modified, it is marked dirty. A cold buffer is a buffer that has not been recently used according to the least recently used (LRU) algorith...

Using GREP in UNIX

How To Use grep Command In Linux / UNIX by VIVEK GITE on AUGUST 2, 2007 · 147 COMMENTS H ow do I use grep command in Linux? grep command searches the given file for lines containing a match to the given strings or words. By default, grep prints the matching lines. Use grep to search for lines of text that match one or many regular expressions, and outputs only the matching lines. The name, "grep", derives from the command used to perform a similar operation, using the Unix/Linux text editor ed: g/re/p grep command syntax grep 'word' filename grep 'string1 string2' filename cat otherfile | grep 'something' command | grep 'something' Use grep to search file Search /etc/passwd for boo user: $ grep boo /etc/passwd You can force grep to ignore word case i.e match boo, Boo, BOO and all other combination with -i option: $ grep -i "boo" /etc/passwd Use grep recursively You can search recursively i.e. read all files under each ...

SBI IBPS IT Officer Scoring Topics #1

G3 is a computer CHIP If instruction RST-5 is written in a program, the program control will jump to location 0028H . TOP-DOWN is a tree PREORDER traversing . An Operand STACK is essential for conversion to INFIX Expression. Header of IP is FIXED part of 20 Bytes. FENCE register is used for MEMORY PROTECTION . YACC semantic action is sequence of C Statements. s Symbol represents SYMMETRIC DIFFERENCE. E.g. AsB 5 th NF is related to JOIN DEPENDENCY. 8086 Microprocessor is a 16 bit Processor. A total of about 1 million bytes can be directly addressed by the 8086 microprocessor 8086 has 8 flags Compare to 8086, the 80286 provides a higher degree of memory operation The address space of 8086 Microprocessor is 2 16 = 1MB. The action of parsing the source program into the proper syntactic classes is known as LEXICAL ANALYSIS. Printf() in C used to print “character, string, float, integer, octal and hexadecimal values” onto the output scree...

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