Re: [sqlite] interrupting sqlite3_prepare_v2
I have investigated futher and noticed that it will break when preparing statements like creating tables from a select. I filed a bugreport with example code at: http://www.sqlite.org/cvstrac/tktview?tn=3155 Dennis Cote wrote: Daniel Önnerby wrote: Sometimes this interrupt occur in the middle of a sqlite3_prepare_v2 and in some cases this will cause my application to break in the SQLite code somewhere. Please let me know if you want me to investigate this futher. Yes, please do so if you have the time. If you locate a bug it will help all users of SQLite. Dennis Cote ___ 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] quoted .import
Hi Is there a way to get .import lt;filenamegt; lt;tablegt; to process quoted columns? aka if .separator , then any quoted column with hello, world will break it. I do not control the exports which are daily derived dumps from mysql and db2 databases. I did a test with unquoted export with separator '_#_' which worked excellent, but this will mess up other programs working on the export files. Thank You all -- Morten Bjoernsvik, Oslo, Norway _ Alt i ett. Få Yahoo! Mail med adressekartotek, kalender og notisblokk. http://no.mail.yahoo.com ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] SQLite Analyzer OSX
Am 02.06.2008 um 07:17 schrieb Bruce Robertson: I see that SQLite3 Analyzer for OSX is listed on the download page but no instructions are provided and when unzipped it does nothing. What are we supposed to do with this? Hmmh - I downloaded and unzipped the archive and launched the sqlite3_analyzer_3.5.4.bin executable and it said: Usage: database-name So I launched it with our database file as the single argument and it created some statistics about the database. Guess that's what it's supposed to do... HTH, /jum P.S.: You may have to make the .bin file executable in order to launch it ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Corrupted sqlite_sequence table
Were you able to successfully reproduce the corruption using the scripts and databases I sent? We're having a lot more trouble with this problem and our earlier workaround is proving troublesome in some situations. Thanks, Sam On Wed, May 28, 2008 at 7:25 PM, D. Richard Hipp [EMAIL PROTECTED] wrote: On May 28, 2008, at 7:21 PM, Samuel Neff wrote: It happens every time. I can send you a db and the update scripts, but I'll need you to keep it confidential (not signed affidavit or anything like that, just understanding that it's confidential). Please confirm this is ok and also which address I should send it to (if other than the one you're using for this list). No one will see the database besides me. I will delete it once the bug is fixed. Send to the address below. D. Richard Hipp [EMAIL PROTECTED] -- - We're Hiring! Seeking passionate Flex, C#, or C++ (RTSP, H264) developer. Position is in the Washington D.C. metro area. Contact [EMAIL PROTECTED] ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] reading a row that has been deleted
Hi Keith, Your observation is correct. I did not know that when selecting a table a shared lock is aquired by the reader and writes are locked out until the last row is read or stmt is finialized. This is true even for in-memory database. One cure for this problem is to create a temorary table based on the result set of the select statement. Then this temp table can be read without locking out writers from the original table. CREATE TABLE t1select AS SELECT * FROM t1; Thanks, -Alex On Sun, Jun 1, 2008 at 5:37 PM, Keith Goodman [EMAIL PROTECTED] wrote: On Sun, Jun 1, 2008 at 2:19 PM, Alex Katebi [EMAIL PROTECTED] wrote: Hi All, I have a in-memory database with some tables. Each table has a single record writer and multiple readers. Readers and writes prepare their own sqlite3_stmt for the db. Everyone operates within a single thread. What happens if a reader wants to read a record that has been deleted by the writer? I must be too new to understand the question. But if the record is deleted then you can't select it. Are you worried about a race condition? I think sqlite takes care of those with locks. ___ 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] reading a row that has been deleted
On Mon, Jun 2, 2008 at 8:12 AM, Alex Katebi [EMAIL PROTECTED] wrote: Hi Keith, Your observation is correct. I did not know that when selecting a table a shared lock is aquired by the reader and writes are locked out until the last row is read or stmt is finialized. This is true even for in-memory database. One cure for this problem is to create a temorary table based on the result set of the select statement. Then this temp table can be read without locking out writers from the original table. CREATE TABLE t1select AS SELECT * FROM t1; How about keep trying to write until the database is not busy? Would that work? Then you only have one copy of the data. Creating the temp table may be faster than a fancy select statement but the problem, while less frequent, still remains (reading while the db is locked for writing). ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Corrupted sqlite_sequence table
Samuel Neff wrote: Were you able to successfully reproduce the corruption using the scripts and databases I sent? We're having a lot more trouble with this problem and our earlier workaround is proving troublesome in some situations. I think it has been fixed. See http://www.sqlite.org/cvstrac/tktview?tn=3148 for details. HTH Dennis Cote ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Corrupted sqlite_sequence table
great, thanks! On Mon, Jun 2, 2008 at 11:55 AM, Dennis Cote [EMAIL PROTECTED] wrote: Samuel Neff wrote: Were you able to successfully reproduce the corruption using the scripts and databases I sent? We're having a lot more trouble with this problem and our earlier workaround is proving troublesome in some situations. I think it has been fixed. See http://www.sqlite.org/cvstrac/tktview?tn=3148 for details. HTH Dennis Cote -- - We're Hiring! Seeking passionate Flex, C#, or C++ (RTSP, H264) developer. Position is in the Washington D.C. metro area. Contact [EMAIL PROTECTED] ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] reading a row that has been deleted
Keith, For normal operations the writer will wait until the reading is done. But I have a client that is remote and is very slow and could sit on a select statement indefinitly. In this case I would need to create a temp table. Thanks, -Alex On Mon, Jun 2, 2008 at 11:53 AM, Keith Goodman [EMAIL PROTECTED] wrote: On Mon, Jun 2, 2008 at 8:12 AM, Alex Katebi [EMAIL PROTECTED] wrote: Hi Keith, Your observation is correct. I did not know that when selecting a table a shared lock is aquired by the reader and writes are locked out until the last row is read or stmt is finialized. This is true even for in-memory database. One cure for this problem is to create a temorary table based on the result set of the select statement. Then this temp table can be read without locking out writers from the original table. CREATE TABLE t1select AS SELECT * FROM t1; How about keep trying to write until the database is not busy? Would that work? Then you only have one copy of the data. Creating the temp table may be faster than a fancy select statement but the problem, while less frequent, still remains (reading while the db is locked for writing). ___ 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] transaction recovery question
Simple enough to test... just open two sqlite sessions and try it... Process B will recover the database when the transaction begins. Are you having an issue with sqlite doing something different? HTH Robert Lehr [EMAIL PROTECTED] wrote: I have a question about recovering from a transaction that was not completed by a process b/c it terminated abnormally, e.g., careless SIGKILL or segfault. The scenario involves multiple processes having the database open. * process A opens the database * process B opens the database * process A starts a transaction * process A terminates abnormally BEFORE completing the transaction * process B starts a transaction the database is now in an indeterminate state. what happens in process B? -rlehr Robert Lehr Cadence Design Systems, Inc ___ 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] transaction recovery question
Robert Lehr [EMAIL PROTECTED] wrote: I have a question about recovering from a transaction that was not completed by a process b/c it terminated abnormally, e.g., careless SIGKILL or segfault. The scenario involves multiple processes having the database open. * process A opens the database * process B opens the database * process A starts a transaction * process A terminates abnormally BEFORE completing the transaction * process B starts a transaction the database is now in an indeterminate state. what happens in process B? http://sqlite.org/atomiccommit.html When B starts a transaction, it notices a hot rollback journal left behind by process A. It then uses this journal to undo (roll back) any changes process A may have made in the database file but haven't committed. The database is restored to the state it was in before process A started its transaction. Igor Tandetnik ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Sqlite on RAM
Hello.- How many db's can i have on RAM? Thanks -- Ing. Hildemaro Carrasquel Ingeniero de Proyectos Cel.: 04164388917/04121832139 ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] SQLite3 file format
Well, is there any way to determine, from an sqlite database file, the exact dot dot version of sqlite3 which produced the file? A quick hack is OK since I don't need to do this in production, just troubleshoot a possible forward-compatibility issue with a remote user. I see that the first few bytes in the file are always SQLite format 3 but the following bytes don't seem to add up to the dot dots. Thanks, Jerry Krinock ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
