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More Free Online Tests and Certifications



1. http://ranksheet.com,

This site gives your free online tests and helps you build your resume. Tests are for older version, why bother when its free.

2. WIZIQ.COM
    Oracle Certified Associate -- http://www.wiziq.com/tests/oca,
    For DBA -- http://www.wiziq.com/tests/dba,
    SQL -- http://www.wiziq.com/tests/search.aspx?qry=sql

This site gives you multiple tests which will help you prepare for OCA exams.

3. http://www.ncsacademy.com/freetest.cfm
    http://www.msexpert.com/exams/examlist.asp

Not that great certifications but kind of ok to have certifications in different domains.

Comments

Dharma said…
It's Useful sir, Thank you fro sharing
Ajay Kumar Das said…
Hello Sir
can you please tell my answer on below question correct or not???

QUESTION:1
----------------
9. Table - Products has number of products as below

Productid ProductName

1 iPhone

2 iPad

3 BlackBerry

Write a SQL query that returns the ProductId of the iPad.

ANSWER:
--------------
SQL>select productname,productId

from products

where productName='iPad'

/
Thanks for sharing your blog with us

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SQL> startup mount pfile='/tmp/initdlfasp12.ora'
ORA-27102: out of memory
Linux-x86_64 Error: 28: No space left on device


This as you can see is on Linux x86 with 64 bit processor. We got this error after we changed SGA on 10gR2 database. So was sure that this is something to do with the OS.

Parameters to check for this are shmall.

shmall is the total amount of shared memory, in pages, that the system can use at one time.

$cat /proc/sys/kernel/shmmax
53687091200

$ getconf PAGE_SIZE
4096

As per Oracle SHMALL should be set to the total amount of physical RAM divided by page size.

Our system has 64GB memory, so change kernel.shmall = 1024 * 1024 * 1024 * 64 / 4096 = 16777216


Once this value is calculated you can modify Linux system configuration file directly.

$ su - root
vi /etc/sysctl.conf file:
kernel.shmall=16777216

and

# sysctl -p

Once this is done the database was started without any problem.