Re: [sqlite] Speed Test Done !
You can load sqlite into memory? I do have 2GB of RAM. Richar d On Thu, 06 Oct 2005 00:04:29 -0400, Lindsay <[EMAIL PROTECTED]> wrote: Richard wrote: Still have found no sql program yet, that can beat Panorama in speed. Since Panorama is RAM based, how about if you did your speed test with a SQLite in memory database ?
Re: [sqlite] Speed Test Done !
To find 32.0833 from field A, in Table T Richard PS: Nothing is index On Thu, 06 Oct 2005 01:17:35 -0400, Puneet Kishor <[EMAIL PROTECTED]> wrote: On Oct 5, 2005, at 10:57 PM, Richard wrote: Well, finally import 9,337,681 records into sqlite3 test2.db and ran the test. import sqtest4.txt : 2 min 28 seconds select A, '32.0833' From T ; 9 min 20 seconds there is no constraint in the above statement... you are selecting A (which, I am assuming, is a column name) and a string that looks like a number from table T. Is that what you really want? And, finally, have you indexed the table? -- I use another database for MacOS X also works on Windows, Call Panorama Did another test, comparing database... import sqtest4.txt : 36 seconds select from Field A contains 32.0833 / 55 seconds found 4322 records out of 9,337,681 Still have found no sql program yet, that can beat Panorama in speed. Regards- Richard Nagle CMS -- Puneet Kishor
Re: [sqlite] Speed Test Done !
On Oct 5, 2005, at 10:57 PM, Richard wrote: Well, finally import 9,337,681 records into sqlite3 test2.db and ran the test. import sqtest4.txt : 2 min 28 seconds select A, '32.0833' From T ; 9 min 20 seconds there is no constraint in the above statement... you are selecting A (which, I am assuming, is a column name) and a string that looks like a number from table T. Is that what you really want? And, finally, have you indexed the table? -- I use another database for MacOS X also works on Windows, Call Panorama Did another test, comparing database... import sqtest4.txt : 36 seconds select from Field A contains 32.0833 / 55 seconds found 4322 records out of 9,337,681 Still have found no sql program yet, that can beat Panorama in speed. Regards- Richard Nagle CMS -- Puneet Kishor
Re: [sqlite] Speed Test Done !
Richard wrote: Still have found no sql program yet, that can beat Panorama in speed. Since Panorama is RAM based, how about if you did your speed test with a SQLite in memory database ? -- Lindsay
[sqlite] Speed Test Done !
Well, finally import 9,337,681 records into sqlite3 test2.db and ran the test. import sqtest4.txt : 2 min 28 seconds select A, '32.0833' From T ; 9 min 20 seconds -- I use another database for MacOS X also works on Windows, Call Panorama Did another test, comparing database... import sqtest4.txt : 36 seconds select from Field A contains 32.0833 / 55 seconds found 4322 records out of 9,337,681 Still have found no sql program yet, that can beat Panorama in speed. Regards- Richard Nagle CMS
[sqlite] Maintaining a sequence that's not rowid
In my app (a perl/web-based on-line training system), I have a table of users with an integer primary key column, tech_id. The tech_ids are created by a foreign system, and either imported with other data, or inserted as-received by my app. In enhancing the app, I'm finding it desirable to insert self-registered technician candidates in this table with a tech_id that's outside the sequence of the current tech_id, a temporary tech ID. When the tech passes the on-line exam, the tech_id would be updated with the permanent tech_id from the foreign DB. I want to have SQLite generate these temporary IDs. I'm looking for suggestions on how to do this with SQLite3. As a test case, I came up with this scanario: create table t1 (a integer primary key autoincrement, b text); create trigger deleteme after insert on t1 begin delete from t1 where a = new.a; end; insert into t1 values (null, 'a'); then get the last_insert_rowid which seems to work. The table itself never holds any data, but, by virtue of 'autoincrement', SQLite keeps track of the next value for column, "a". So, finally, my questions: What's wrong with this scheme? How bulletproof is it? What would work better? Thanks! -Clark
Re: [sqlite] Transactions
On Tue, 4 Oct 2005, Martin Engelschalk wrote: >Hello Christian, > >thank you, but synchronous is already off. What i aim to avoid is >writing the rollback - journal. In order to rollback, some additional >writing to disk is surely unaviodable. You'll have to write your own pager layer, as there is currently no way to disable the rollback journal. Note, with no rollback journal, you'll not be able to rollback a transaction. Any updates you make will be final even before a commit. Another option might be to use a memory database, and write periodic snapshots to disk in the form of a SQL text file. Look at shell.c in the SQLite source for an example of how to do this (look for implementation of the .dump command.) The SQL file then becomes your checkpoint, and can also be compressed quite nicely which may save disk space. This is how the likes of HSQL works. Of course, if this is an embedded application, memory may be a problem with a memory database. YMMV. > >Martin > >Christian Smith schrieb: > >>On Tue, 4 Oct 2005, Martin Engelschalk wrote: >> >> >> >>>Hi all, >>> >>>it may sound strange, but I do not need transactions. Also i do not >>>care if the database is corrupted in case of a program or system crash. >>>So: is it possible to disable transactions in sqlite? Mr. Mark Allan >>>seems to have done this. Could i speed up my writes this way? >>> >>> >> >> >>Turn off synchronous writes: >>http://www.sqlite.org/pragma.html >> >>Look for the synchronous pragma. Set it to OFF: >>sqlite> PRAGMA synchronous = OFF; >> >>Updates to transactions will no longer fsync() data to the disk, and >>instead rely on OS write-back caching, which can significantly improve >>speed at the cost of chances of corruption in case of system crash. >> >> >> >> >>>Thanks, >>>Martin >>> >>> >>> >> >> >> > -- /"\ \ /ASCII RIBBON CAMPAIGN - AGAINST HTML MAIL X - AGAINST MS ATTACHMENTS / \
Re: [sqlite] how to secure SQLite database
Greeting sailendra, sai kalyanam wrote: Greetings all, can you pls any help me how to secure sqlite database. there is no userid and password to open the database. what are the security issues in SQLite database. can you pls help in this issue. You need to encrypt your database. Dr. Hipp, the creator of SQLite, has a very reasonably priced solution. See http://www.hwaci.com/sw/sqlite/prosupport.html Ulrik Petersen -- Ulrik Petersen, Denmark
Re: [sqlite] how to secure SQLite database
Hi, sqlite does not know users. You can restrict access using the file privileges for the database - file (chown / chmod). If you want users/passwords in your application, you have to implement this in your application. Martin sai kalyanam schrieb: Greetings all, can you pls any help me how to secure sqlite database. there is no userid and password to open the database. what are the security issues in SQLite database. can you pls help in this issue. Thanks sailendra - Yahoo! for Good Click here to donate to the Hurricane Katrina relief effort.
[sqlite] how to secure SQLite database
Greetings all, can you pls any help me how to secure sqlite database. there is no userid and password to open the database. what are the security issues in SQLite database. can you pls help in this issue. Thanks sailendra - Yahoo! for Good Click here to donate to the Hurricane Katrina relief effort.
