How to let the created table visible to current process when using SPI_execute("create table ...")?

When Postmaster starts, I've forked another process AP just as syslogger,
bgwritter,...
In the process AP, If I can't find a table, I would create one, the codes
are:
char * sqlCreate_DM_ = "create table DM_( ...); ";
SPI_connect();
int ret = SPI_execute(sqlCreate_DM_, false, 1);
SPI_finish();
but after SPI_finish(); I found the created table DM_ is not visible to
current process, how to resolve it?
Thanks!