Dear all, Yesterday,I had done a test about the speed of MonetDB.I used the example code make a test.the red part is my adding code. #include <mapilib/Mapi.h> #include <stdio.h> #include <stdlib.h> void die(Mapi dbh, MapiHdl hdl) { if (hdl != NULL) { mapi_explain_query(hdl, stderr); do { if (mapi_result_error(hdl) != NULL) mapi_explain_result(hdl, stderr); } while (mapi_next_result(hdl) == 1); mapi_close_handle(hdl); mapi_destroy(dbh); } else if (dbh != NULL) { mapi_explain(dbh, stderr); mapi_destroy(dbh); } else { fprintf(stderr, "command failed\n"); } exit(-1); } MapiHdl query(Mapi dbh, char *q) { MapiHdl ret = NULL; if ((ret = mapi_query(dbh, q)) == NULL || mapi_error(dbh) != MOK) die(dbh, ret); return(ret); } void update(Mapi dbh, char *q) { MapiHdl ret = query(dbh, q); if (mapi_close_handle(ret) != MOK) die(dbh, ret); } int main(int argc, char *argv[]) { Mapi dbh; MapiHdl hdl = NULL; char *name; char *age; dbh = mapi_connect("localhost", 50000, "monetdb", "monetdb", "sql", "demo"); if (mapi_error(dbh)) die(dbh, hdl); update(dbh, "CREATE TABLE emp (name VARCHAR(20), age INT)"); for(int i = 0;i<10000;i++) { update(dbh, "INSERT INTO emp VALUES ('John', 23)"); } //why this cast more then serveral minutes .can you help me? hdl = query(dbh, "SELECT * FROM emp"); while (mapi_fetch_row(hdl)) { name = mapi_fetch_field(hdl, 0); age = mapi_fetch_field(hdl, 1); printf("%s is %s\n", name, age); } mapi_close_handle(hdl); mapi_destroy(dbh); return(0); } Peter Qin peterqin1980@gmail.com