Hi,
Yes, it explains allot.
But, according to you, the following program should work.
I don't use transactions, shared cache or threads.
Just run the checkpoint from another connection.
And still - WAL file is getting bigger and bigger without limit.
If I do the checkpoint with the same connection, everything work perfectly.
What am I doing wrong?
===================================
#include "sqlite3.h"
#include "stdio.h"
#include "stdlib.h"
#include "fcntl.h"
static void sql_exec(sqlite3 *conn, char *query)
{
char *err;
if (sqlite3_exec(conn, query, NULL, 0, &err))
{
printf("sqlite: failed exec %s. err: %s\n", query, err);
exit(1);
}
}
static sqlite3 *sql_open_conn(void)
{
sqlite3 *conn;
if (sqlite3_open_v2("test.db", &conn, SQLITE_OPEN_READWRITE, NULL))
{
printf("sqlite3_open_v2 failed\n");
exit(1);
}
return conn;
}
static int do_checkpoint()
{
sqlite3 *conn;
conn = sql_open_conn();
if (sqlite3_wal_checkpoint(conn, NULL))
{
printf("sqlite3_wal_autocheckpoint failed\n");
exit(1);
}
sqlite3_close(conn);
}
int main(int argc, char **argv)
{
char *err_msg = NULL;
pthread_t thread;
int fd, i;
sqlite3 *conn;
if (unlink("test.db") || unlink("test.db-wal"))
{
printf("failed unlink test.db\n");
exit(1);
}
fd = open("test.db", O_CREAT|O_RDWR, 0666);
if (fd<0)
{
printf("could not open test.db\n");
exit(1);
}
close(fd);
conn = sql_open_conn();
sql_exec(conn, "PRAGMA journal_mode=WAL");
sql_exec(conn, "PRAGMA synchronous=normal");
sql_exec(conn, "PRAGMA temp_store=memory");
sql_exec(conn, "PRAGMA wal_autocheckpoint=-1");
sql_exec(conn, "create table tbl1 (one varchar(20), two varchar(20))");
while (1)
{
if (!(i++%1000))
do_checkpoint();
sql_exec(conn, "INSERT INTO tbl1 values('aaaaaaaaaaaaaaaaaaa', "
"'bbbbbbbbbbbbbbbbbbb')");
}
sqlite3_close(conn);
return 0;
}
On Tue, Aug 10, 2010 at 1:52 PM, Dan Kennedy <danielk1...@gmail.com> wrote:
>
>
> > Hi,
> > I just wanted to add that I changed the program a little bit to not
> > use
> > transactions and threads, and I still get the same problem (huge WAL
> > file).
> > All I do is endless loop of insert, and every X insert, I perform a
> > checkpoint on another sqlite connection (but in the same thread).
> > It only worked if I do the checkpoint on the same connection.
>
> You cannot run a checkpoint from within a transaction. If
> you are in shared-cache mode, this means you cannot run a
> checkpoint while any connection to the same database has
> an open transaction.
>
> Does that explain anything?
>
> Dan.
>
> _______________________________________________
> sqlite-users mailing list
> sqlite-users@sqlite.org
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>
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