Oracle call interface said :
In the Instant Client mode, if the ORA_TZFILE variable is not set, then the larger,
default, timezlrg_n.dat file from the Data Shared Library is used. If the smaller
timezone_n.dat file is to be used from the Data Shared Library, then set the ORA_
TZFILE environment variable to the name of the file without any absolute or relative
path names.
On Linux or UNIX:
setenv ORA_TZFILE timezone_n.dat
but i can't find timezone_n.dat file