"SGA specified for Logical Standby is too small"
*Cause: MAX_SGA must be at least 10 Megabytes for proper functioning
of Logical Standby.
*Action: Specify the value of MAX_SGA to be greater than or equal to 10Mb.
Alternatively, increase the shared_pool_size/sga_target so that 1/4
of it will amount to 10 Megabytes.