On Tue, 11 Dec 2007 15:37:52 +0530, "Yuvaraj Athur Raghuvir" <[EMAIL PROTECTED]> wrote:
>Thanks. > >To ensure that the database size is closest to the data in the database, I >see the following have to be taken care off: >a) The latest in-memory transactions have to be flushed to disk. >How? >b) The space has to be reclaimed after delete/drop. >For this I use the PRAGMA VACUUM statement. > >How do I ensure that there is nothing >pending in the memory so that external >file size APIs are accurate for my work? Using transactions (BEGIN/COMMIT): after every commit all data is flushed to disk (and also kept in memory in the page cache for future reference). In other words: whenever there is no journal file, the database file is up to date. Without explicit transactions, every SQL statement that modifies the database is a transaction in itself (autocommit). Ref: http://www.sqlite.org/arch.html http://www.sqlite.org/atomiccommit.html http://www.sqlite.org/lockingv3.html (and perhaps http://www.sqlite.org/sharedcache.html ) >~Yuva > >On Dec 11, 2007 2:18 PM, Dan <[EMAIL PROTECTED]> wrote: > >> >> On Dec 11, 2007, at 3:00 PM, Yuvaraj Athur Raghuvir wrote: >> >> > 1) Can I assume that MAX_PAGE_COUNT * PAGE_SIZE = size of file on >> > disk? >> >> No. It is the maximum size of the file. An attempt to >> insert data that would cause the file to grow larger than >> this will return SQLITE_FULL. >> >> > 2) When insert statements are being executed, I would like to - for >> > example >> > - redirect the queries to another data base when 70% of the space is >> > reached. How can I do that? >> >> I think you would have to check the size of the file on disk using >> external (non-SQLite) APIs before each insert. >> >> Dan. >> >> >> >> >> > >> > ~Yuva >> > >> > On Dec 11, 2007 11:48 AM, Dan <[EMAIL PROTECTED]> wrote: >> > >> >> >> >> On Dec 11, 2007, at 8:39 AM, Yuvaraj Athur Raghuvir wrote: >> >> >> >>> Hello, >> >>> >> >>> I am trying a simple experiment where I want to limit the size of >> >>> the file >> >>> that SQLite uses. Further, I want to manage the growth of the >> >>> database(s) >> >>> explicitly. >> >>> >> >>> One of the first aspects I want to manage is the size of the file >> >>> on the >> >>> disk. I want to set hard limits on the size and during query >> >>> execution, on >> >>> failures, explicitly manage the persistence across multiple >> >>> databases (or >> >>> disk files). >> >> >> >> I'm not sure I understand the second part of the question. >> >> >> >> Does "pragma max_page_count" (http://www.sqlite.org/pragma.html) >> >> help any? >> >> >> >> Dan. >> >> >> >> >> >>> >> >>> (a) Since I am new to SQLite, I would like to hear from the >> >>> community on how >> >>> this can be done using what SQLite3 provides. >> >>> >> >>> If there are specifics that need to be managed outside the >> >>> context of >> >>> SQLite, I am fine with that. However, for doing external >> >>> management I >> >>> believe I would need hooks into the basic management of the >> >>> database. What I >> >>> would like to know is >> >>> (b) are such hooks already available? >> >>> (c) if these need to be implemented, the list of source files I >> >>> need to look >> >>> into will help. >> >>> >> >>> Thanks for your time, >> >>> Yuva >> >>> >> >>> p.s: I am resending this since I am not sure if it has reached the >> >>> mailing >> >>> list. >> >> >> >> >> >> >> >> --------------------------------------------------------------------- >> >> -------- >> >> To unsubscribe, send email to [EMAIL PROTECTED] >> >> >> >> --------------------------------------------------------------------- >> >> -------- >> >> >> >> >> >> >> >> ----------------------------------------------------------------------------- >> To unsubscribe, send email to [EMAIL PROTECTED] >> >> ----------------------------------------------------------------------------- >> >> -- ( Kees Nuyt ) c[_] ----------------------------------------------------------------------------- To unsubscribe, send email to [EMAIL PROTECTED] -----------------------------------------------------------------------------
