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Full Discussion: Regarding Multi-Threading
Top Forums Programming Regarding Multi-Threading Post 78064 by mbb on Friday 15th of July 2005 05:31:03 AM
Old 07-15-2005
Some more info might help, like which database are you using? e.g. Informix, Oracle, SqlServer etc.

One thing is for sure - if you have a database table it will be quicker to load to if the table did not have any indicies. Usually it is better to drop the indicies, load, then re-create the indicies afterwards.

Other things to consider are referential integrity checks made by the database and constraint checks.

After such a large load, you may have to update statistical information on the table to allow the database optimizer to use the table in the optimal way e.g. 'update statistics for table' in Informix.

Disabling transaction logging on the table or database may increase the performance.

Also some database products have data loader applications to allow for high performance bulk loading of a database.

Ultimately, a large data file will take some time and you will always be bound by the performance of your physical devices.

Hope this helps

MBB
 

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LEARN ABOUT DEBIAN

snprimedb

snprimedb,v0.3.8(8)					      System Manager's Manual					       snprimedb,v0.3.8(8)

NAME

       snprimedb - feed the sn database.

SYNOPSIS

       snprimedb [-i] (no arguments)

DESCRIPTION

       snprimedb reads records from its standard input and enters them into the database.  The database is appended to; if you want to start a new
       database, you would delete the database files .chain, .table, .newsgroup before running this program.

       The main purpose of snprimedb is to rebuild the ID database.  Then its input is usually obtained from snscan.

       If the option -i is given, simply initialize the database files if they do not exist, and exit.

       Input lines are of the format
       newsgroup id serial where newsgroup is the newsgroup the article may be found in, id is its message id, and serial is the local serial num-
       ber of that article in that newsgroup.  If newsgroup is the special name =junk, then the whole line is ignored.

       You will need to be root or the owner of /var/spool/sn to do this.

BUGS

       snprimedb does not check to see that the articles really exist.	Also the size of the hash table is fixed at compile time.

       Under  degenerate conditions, the hash table file .chain (see below) could grow very large, with reclaimed space remaining unused.  This is
       due to the very simple file space allocator, which doesn't know how to coalesce adjacent free areas.  It doesn't know  how  to  split  them
       either.	The allocator assumes that the shape of the distribution of record lengths remains quite constant over time.

       The hash table database doesn't make any attempt to reduce its footprint.  This should be acceptable, since the database is shared.

ENVIRONMENT VARIABLES

       SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news spool directory.

FILES

       /var/spool/sn/.table
	      snprimedb uses this file as the index of the hash table, and ...

       /var/spool/sn/.chain
	      as the hash chains, and ...

       /var/spool/sn/.newsgroup
	      to attach an integer identifier to each newsgroup name.  This file is a human-readable flat text file.

N.B.								    Harold Tay						       snprimedb,v0.3.8(8)
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