Hi,
I found sqlite is kind of slow on windows (2003 server and XP professional).
Here is what i did:
1) downloaded and installed sqlite3.dll (version 3.6.5).
2) created a MSVC 6.0 C++ projects with the following code, which basically
runs a list of SQL statments on a opened database:
#include <stdio.h>
#include "pctimer.h"
#include "sqlite3.h"
int main(int argc, char** argv)
{
int ret;
double start, duration;
char* error = NULL;
char* database_name = "test.dat";
sqlite3* database = NULL;
ret = sqlite3_open(database_name, &database);
char* sql_list[] = {
"create table if not exists t1(f1)",
"insert into t1 values('a')",
"select * from t1",
"drop table if exists t1"
};
for (int i = 0; i < 4; i++)
{
TIME(ret = sqlite3_exec(database, sql_list[i], NULL, NULL, &error), 1000);
printf("sql_list[%d] = %d, %f msec\n", i, ret, duration);
}
sqlite3_close(database);
return 0;
}
in "pctimer.h"
#define TIME(Statement, Unit) start = pctimer(), Statement, duration =
(pctimer() - start) * Unit
#include <windows.h>
__inline pctimer_t pctimer()
{
static LARGE_INTEGER pcount, pcfreq;
static int initflag;
if (!initflag)
{
QueryPerformanceFrequency(&pcfreq);
initflag++;
}
QueryPerformanceCounter(&pcount);
return (double)pcount.QuadPart / (double)pcfreq.QuadPart;
}
Here is a typical outputs from the program running in debug mode:
sql_list[0] = 0, 115.522582 msec
sql_list[1] = 0, 146.979062 msec
sql_list[2] = 0, 0.152468 msec
sql_list[3] = 0, 127.423370 msec
The "create table", "insert into" and "drop table" are slower
than I expected whereas the "select" is ok (compared to published sqlite
performance). I tried turning off antivirus but got the same results. Notice
my constraint is these SQL statements must run one by one, not within a
transaction.
My questions are:
1) are these expected performance on windows?
2) if not, what can be done to improve it?
Many thanks in advance.
FLX
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