02-27-2013
Quote:
Originally Posted by
sonia102
I used :
"delete from tablename
where seq_id = 'seq2'
i deleted all the other sequences.
and after that
delete from tablename
where stop_id>=1000000 ;
i dont know how to reduce the original file size
its 300mb and i want to retain the first 100mb .
could some1 suggest?
---------- Post updated 02-26-13 at 07:59 PM ---------- Previous update was 02-25-13 at 09:54 PM ----------
hi
is there any command to count the number of bits in a file ?
Anything that i can use to retain the first 1000 or 100mb bits in a file and delte the remaining?
Count the bytes and multiply by 8.
Seriously - I'd propose you learn some basics on databases.
Deleting anything from the outside will corrupt the database rendering it totally unusable.
Deleting sequences does not really save space - they are just metadata worth a few bytes, counters that have a start and end value, and e.g. a step width, all recorded in the DB management structures.
Retaining the "first" 100 MB (= deleting 200 MB above) is pointless as consistent data are spread all over tablespaces/files.
Do as cero proposed - create a new datafile/tablespace, move all relevant data there, and then drop the old structures. Or, seriously consider recreating.
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LEARN ABOUT DEBIAN
grass-sqlite
grass-sqlite(1grass) Grass User's Manual grass-sqlite(1grass)
NAME
grass-sqlite - SQLite driver
SQLite driver SQLite driver in GRASS
Creating a SQLite database
GRASS is automatically creating the SQLite database if it is not yet existing when the first table is created in the SQLite database. It is
sufficient to define the connection (see next step).
Connecting GRASS to SQLite
The database name 'sqlite.db' is at user's choice. Also the file storage location can be freely chosen. If the database does not exist, it
will be automatically created when database content is created:
# example for storing DB in mapset directory (keep single quotes):
db.connect driver=sqlite database='$GISDBASE/$LOCATION_NAME/$MAPSET/sqlite.db'
db.connect -p
Supported SQL commands
All SQL commands supported by SQLite (for limitations, see SQLite help page: SQL As Understood By SQLite and Unsupported SQL).
Operators available in conditions
All SQL operators supported by SQLite.
Browsing table data in DB
A convenient SQLite front-end is sqlitebrowser. To open a DB file stored within the current mapset, the following way is suggested (corre-
sponds to above database connection):
eval `g.gisenv`
# use double quotes:
sqlitebrowser "$GISDBASE/$LOCATION_NAME/$MAPSET"/sqlite.db
SEE ALSO
db.connect, db.execute, db.select
SQL support in GRASS GIS
SQLite web site, SQLite manual, sqlite - Management Tools
Last changed: $Date: 2011-02-07 18:59:50 +0100 (Mon, 07 Feb 2011) $
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GRASS 6.4.2 grass-sqlite(1grass)