After dismantling the RPi with RTC, clock time become erroneous, so it was reconnected with lots of reboots and set the time manually using the command

sudo hwclock --set --date "01/16/2014 08:33:01"

to set the computer time using https://wiki.debian.org/DateTime#Set_the_time_manually

date --set 1998-11-02 
date --set 21:08:00

Now RPI is connected with data card, without connecting serial to USB wire, now the RPi is working without a problem.

Data card is checked with SMS also, so now connecting the serial USB to RPi, by connecting the USB serial second to a data card, not showing any problem.

create sqlite database by

sudo apt-get install sqlite3 libsqlite3-dev
sqlite3 mydatabase.db
CREATE TABLE data3 (SNo  INTEGER PRIMARY KEY, data VARCHAR(100));