On 6 Aug 2013, at 3:23am, Bo Peng <ben....@gmail.com> wrote: > For > example, if we create 1000 tables and insert records to them in batch,
Do you really have 1000 different schemas so you need 1000 different tables to store data ? Can these not be merged into one table ? Merging those would provide significant increase in speed. In a SQLite database tables are arranged in a list. If you access a random table and have 1000 tables in a database file, SQLite has to look down an average of 500 tables in the list before it finds the one you want. If the table name is just a value in a column then it can use indexes you've created to jump straight to the rows you want. > the data of each table will likely spread evenly across the whole > database, and almost all pages need to be read when we go through > records of a table. Do a VACUUM during downtime, probably overnight. Of course, you will need disks which are up to three times the size of your database to make sure the VACUUM can complete. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
