Hi,
my task is to parse a lot of files and then insert them to sqlite database.
it could be thousands of files. i use c#.
im starting a transaction
then make a lot of inserts and commit.
ive got about 30 inserts per second but after a while it is dropping to
about 1-2 inserts per second. it takse about ~500 inserts to drop to this
1-2 insert per sec.
ive got indexes on this database - but this dosnt make difference as i
checked on copy without indexes.
1) why it is getting tired ans slows down? how to fix it?
o tried to this in a loop with 100 inserts to keep speed reasonable. then
closing database and reopening.
after close and reopen next commit gets SQLITE_BUSY/* The database file is
locked */
2) wtf?
please help me im stucked
code is like:
//done by background worker
void import(object sender, DoWorkEventArgs e)
{
DataTable tab;
tab = PST_POSTGRES.Postgres.Query(textBox6.Text, textBox1.Text,
textBox3.Text, textBox4.Text, textBox5.Text, textBox2.Text);
SQLiteWrapper.SQLite db = new SQLiteWrapper.SQLite();
db.OpenDatabase(sqlite_db);
db.BeginTransaction();
foreach (DataRow r in tab.Rows)
{
if (bw.CancellationPending == true)
{
e.Cancel = true;
break;
}
//import here
foreach (object o in imported)
{
doinserts(o)
}
//here is an reopen condition - when gets slower
if ((((long)(imported * 1000)) / stoper.ElapsedMilliseconds)
< next)
{
db.CommitTransaction();
db.CloseDatabase();
db = new SQLiteWrapper.SQLite();
db.OpenDatabase(sqlite_db);
db.begintransaction();
}
next = (((long)(imported * 1000)) /
stoper.ElapsedMilliseconds);
}
db.CommitTransaction();
db.CloseDatabase();
stoper.Stop();
}
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