Re: [sqlite] size control of sqlite database
Hi Roger, yes, thank you, i did not see this. Martin Roger Binns wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Martin.Engelschalk wrote: > >> However, i could not find a way to determine when the empty pages are >> used up and the file will start to grow again without checking the file >> size after every insert. >> > > Doesn't PRAGMA freelist_count help with that? There is also PRAGMA > page_count and another to determine page size so you can do all these > calculations without going outside of SQLite. > > Roger > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.9 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iEYEARECAAYFAktPZtwACgkQmOOfHg372QRHEgCeKwRMG+DpI1Kq/2jeo/Iw/DO0 > DtoAoIYIqt40E9TIWlebbYPta33S6o9r > =pY6s > -END PGP SIGNATURE- > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] size control of sqlite database
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Martin.Engelschalk wrote: > However, i could not find a way to determine when the empty pages are > used up and the file will start to grow again without checking the file > size after every insert. Doesn't PRAGMA freelist_count help with that? There is also PRAGMA page_count and another to determine page size so you can do all these calculations without going outside of SQLite. Roger -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAktPZtwACgkQmOOfHg372QRHEgCeKwRMG+DpI1Kq/2jeo/Iw/DO0 DtoAoIYIqt40E9TIWlebbYPta33S6o9r =pY6s -END PGP SIGNATURE- ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] size control of sqlite database
Hi, a sqlite database is a file, you can get its size using OS calls. It is not possible to create a database with an initial size, because the file grows dynamically when you insert data. To avoid fragmentation, I also looked for a way to allocate empty space inside the database file when creating it. Dr. Hipp proposed to create a table with a single Blob-column, insert a very large, empty blob, and then dropping the table. The file will then keep its size and afterwards reuse the empty pages. However, i could not find a way to determine when the empty pages are used up and the file will start to grow again without checking the file size after every insert. Martin gujx schrieb: > Hi, I’d like to ask some question about the interface of the sqlite > resource. > > Whether there is some interface to control the size of a database, for > example, if I want to create a database with 5M initialized, how can I do > that? And when I make change to a database, for example, insert a row to a > table, then can I get the size of the database now? > > > > Looking forward to your answer. > > > > > > Gu Jinxiang > > > > 以上、よろしくお��いします。 > > > > > > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] size control of sqlite database
Hi, I’d like to ask some question about the interface of the sqlite resource. Whether there is some interface to control the size of a database, for example, if I want to create a database with 5M initialized, how can I do that? And when I make change to a database, for example, insert a row to a table, then can I get the size of the database now? Looking forward to your answer. Gu Jinxiang 以上、よろしくお��いします。 -- A new email address of FJWAN is launched from Apr.1 2007. The updated address is: g...@cn.fujitsu.com Development Dept.I Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST) 8/F., Civil Defense Building, No.189 Guangzhou Road, Nanjing, 210029, China TEL：+86+25-86630566-619 COINS：79955-619 FAX：+86+25-83317685 email：g...@cn.fujitsu.com -- This communication is for use by the intended recipient(s) only and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not an intended recipient of this communication, you are hereby notified that any dissemination, distribution or copying hereof is strictly prohibited. If you have received this communication in error, please notify me by reply e-mail, permanently delete this communication from your system, and destroy any hard copies you may have printed. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
