[sqlite] SQLite - Database disk size difference when tables copied
Hello Pavel, * When I implement the same mechanism for saving the* * memory database back to disk, the size of disk file is 4x of the original* * disk file size.* What is original disk file size here? Is it an empty database, database with some data, database with exactly the same data you are restoring? If the latter then do you restore right over the existing data? If yes how? The original database on disk was created from scratch in memory and saved backup command in regular tclsh. Afterwards it was restored using CREATE TABLE in the EDA tool as mentioned below dbcmd eval CREATE TABLE '$tname' AS SELECT * FROM loadfrom.'$tname' Once it is restored in the EDA tool memory, it is saved back on disk using the commands I mentioned in the first email. Thanks, Madhur ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] SQLite - Database disk size difference when tables copied
Hello,
I am using Tcl Extension (TEA) of SQLite inside an EDA tool which supports
TCL User Shell. I have a strange problem that SQLite version 3.7.10 is
downgraded to 3.5.9 when I load the necessary .so files. Due to this change
the backup and restore commands are probably causing a core dump in the EDA
tool execution.
I have to implement save and restore capability for the memory database
used in the application. Restore I have implemented using traditional
method to first attach the disk database and then copy all tables listed in
sqlite_master table. When I implement the same mechanism for saving the
memory database back to disk, the size of disk file is 4x of the original
disk file size.
What is the reason for this size increase? What can I do to avoid this file
size increase? A long pending question - Why the version is getting
downgraded to 3.5.9 ? The Tcl version is 8.4.x within the EDA tool. Also I
cannot find any SQLite libraries within the tool installation.
dbcmd eval ATTACH DATABASE 'test_disk.db' AS copyto
set tableNames [ dbcmd eval {SELECT name FROM sqlite_master WHERE type
= 'table'} ]
foreach tname $tableNames {
dbcmd eval CREATE TABLE copyto.$tname AS SELECT * FROM $tname
}
--
Regards
Madhur Kashyap
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Re: [sqlite] SQLite - Database disk size difference when tables copied
When I implement the same mechanism for saving the
memory database back to disk, the size of disk file is 4x of the original
disk file size.
What is original disk file size here? Is it an empty database,
database with some data, database with exactly the same data you are
restoring? If the latter then do you restore right over the existing
data? If yes how?
Pavel
On Wed, Aug 22, 2012 at 10:00 PM, Madhur Kashyap
physiologo...@gmail.com wrote:
Hello,
I am using Tcl Extension (TEA) of SQLite inside an EDA tool which supports
TCL User Shell. I have a strange problem that SQLite version 3.7.10 is
downgraded to 3.5.9 when I load the necessary .so files. Due to this change
the backup and restore commands are probably causing a core dump in the EDA
tool execution.
I have to implement save and restore capability for the memory database
used in the application. Restore I have implemented using traditional
method to first attach the disk database and then copy all tables listed in
sqlite_master table. When I implement the same mechanism for saving the
memory database back to disk, the size of disk file is 4x of the original
disk file size.
What is the reason for this size increase? What can I do to avoid this file
size increase? A long pending question - Why the version is getting
downgraded to 3.5.9 ? The Tcl version is 8.4.x within the EDA tool. Also I
cannot find any SQLite libraries within the tool installation.
dbcmd eval ATTACH DATABASE 'test_disk.db' AS copyto
set tableNames [ dbcmd eval {SELECT name FROM sqlite_master WHERE type
= 'table'} ]
foreach tname $tableNames {
dbcmd eval CREATE TABLE copyto.$tname AS SELECT * FROM $tname
}
--
Regards
Madhur Kashyap
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
___
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sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
