Perl-to-Oracle performance: DBI-pack visa 'sqlplus' usage Post: 302371984

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Top Forums UNIX for Advanced & Expert Users Perl-to-Oracle performance: DBI-pack visa 'sqlplus' usage Post 302371984 by jim mcnamara on Monday 16th of November 2009 09:38:49 PM

11-16-2009

Registered User

This is an ill-posed question. perl DBI is faster than sqlplus as a front end. That answers the question.

But. Oracle stores the results of previously parsed queries, which are reused.
So even faster parsing gains you little.

Ok. I've been coding in Oracle since version 2, in 19-um-whatever. I'm older than dirt.
However, SQL code is 85% of performance. Period. Full-table scans instead of using indexes, for example. Reduce excessive disk i/o for queries. All of this is a programmer/application designer problem. Or an exadata problem if you know what that is. Not DBI vs. sqlplus.

Learn to use tkprof. PL/SQL developer. TOAD. Read a Tom Kite book.

The reason you are not getting answers you want is your presupposition:

speed up front = speed in the back end.

It does not work that way - except maybe in special situations - which are usually covered by apps like sqlldr or interesting specialty objects like clustered tables.

jim mcnamara

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jifty::dbi::handle::oracle

Jifty::DBI::Handle::Oracle(3pm) 			User Contributed Perl Documentation			   Jifty::DBI::Handle::Oracle(3pm)

NAME

	 Jifty::DBI::Handle::Oracle - An oracle specific Handle object

SYNOPSIS

DESCRIPTION

       This module provides a subclass of Jifty::DBI::Handle that compensates for some of the idiosyncrasies of Oracle.

METHODS

   connect PARAMHASH: Driver, Database, Host, User, Password
       Takes a paramhash and connects to your DBI datasource.

   database_version
       Returns value of ORA_OCI constant, see "Constants" in DBD::Oracle.

   insert
       Takes a table name as the first argument and assumes that the rest of the arguments are an array of key-value pairs to be inserted.

   build_dsn PARAMHASH
       Takes a bunch of parameters:

       Required: Driver, Database or Host/SID, Optional: Port and RequireSSL

       Builds a dsn suitable for an Oracle DBI connection

   blob_params column_NAME column_type
       Returns a hash ref for the bind_param call to identify BLOB types used by the current database for a particular column type.  The current
       Oracle implementation only supports ORA_CLOB types(112).

   apply_limits STATEMENTREF ROWS_PER_PAGE FIRST_ROW
       takes an SQL SELECT statement and massages it to return ROWS_PER_PAGE starting with FIRST_ROW;

   distinct_query STATEMENTREF
       takes an incomplete SQL SELECT statement and massages it to return a DISTINCT result set.

AUTHOR

       Jesse Vincent, jesse@fsck.com

SEE ALSO

       Jifty::DBI, Jifty::DBI::Handle, DBD::Oracle

perl v5.14.2							    2011-04-26					   Jifty::DBI::Handle::Oracle(3pm)