On Fri, Nov 29, 2013 at 2:37 PM, Igor Tandetnik <i...@tandetnik.org> wrote:
> On 11/29/2013 8:33 AM, Carlos Ferreira wrote: > >> Any of you know how to speed up the creation of empty tables in SQlite? >> >> If I have to create more than 1000 empty tables to initialize my >> application >> document it takes a while.. >> > > Make sure you run all CREATE TABLE statements within a single transaction. > My guess is you don't, and then most of the time is spent in committing an > implicit transaction after every statement. Here's a simple test which shows that in action: [stephan@host:~/tmp]$ i=0; while [ $i -lt 1000 ]; do echo "create table t$i (a,b,c);"; i=$((i + 1)); done > foo.sql [stephan@host:~/tmp]$ wc -l foo.sql 1000 foo.sql [stephan@host:~/tmp]$ echo 'begin;' > bar.sql [stephan@host:~/tmp]$ cat foo.sql >> bar.sql [stephan@host:~/tmp]$ echo 'commit;' >> bar.sql [stephan@host:~/tmp]$ time sqlite3 x.db < foo.sql real 2m25.208s user 0m0.380s sys 0m0.468s [stephan@host:~/tmp]$ rm x.db [stephan@host:~/tmp]$ time sqlite3 x.db < bar.sql real 0m0.344s user 0m0.148s sys 0m0.000s BIG difference. -- ----- stephan beal http://wanderinghorse.net/home/stephan/ http://gplus.to/sgbeal "Since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do." -- Bigby Wolf _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
