If you are looking to migrate your OsCommerce database to Magento database and need it done fast and effectively. please contact me.

core_website - to remove websites
core_store  - to remove store views
core_store_group - to remove stores

############################################
## enable apache served files compression
## http://developer.yahoo.com/performance/rules.html#gzip

# Insert filter
SetOutputFilter DEFLATE

# Netscape 4.x has some problems…
BrowserMatch ^Mozilla/4 gzip-only-text/html

# Netscape 4.06-4.08 have some more problems
BrowserMatch ^Mozilla/4\.0[678] no-gzip

# MSIE masquerades as Netscape, but it is fine
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
# Don’t compress images
SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary

# Make sure proxies don’t deliver the wrong content
Header append Vary User-Agent env=!dont-vary

# enable resulting html compression
php_flag zlib.output_compression on

rm -rf var/cache/*

find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;
chmod 550 pear

php /path/to/magento/shell/log.php clean

Check for the current status of all indices:

php /path/to/magento/shell/indexer.php --status

Refresh a specific index. Choose a specific area to index.

php /path/to/magento/shell/indexer.php info

which gives you

catalog_product_attribute     Product Attributes
catalog_product_price         Product Prices
catalog_url                   Catalog Url Rewrites
catalog_product_flat          Product Flat Data
catalog_category_flat         Category Flat Data
catalog_category_product      Category Products
catalogsearch_fulltext        Catalog Search Index
cataloginventory_stock        Stock status

With the above, you can run each index individually.

php /path/to/magento/shell/indexer.php --reindex catalog_product_flat

/usr/local/bin/php /path/to/magento/cron.php

<?php
/**
* set cookie
* name and value are mandatory; other parameters are optional and can be set as null
* $period = cookie expire date in seconds
*/
Mage::getModel('core/cookie')--->set($name, $value, $period, $path, $domain, $secure, $httponly);
/**
* get cookie with a specific name
* $name = name of the cookie
*/
Mage::getModel('core/cookie')->get($name);
/**
* get all cookies as an array
*/
Mage::getModel('core/cookie')->get();
/**
* delete/remove cookie
* $name is mandatory; other parameters are optional and can be set to null
*/
Mage::getModel('core/cookie')->delete($name, $path, $domain, $secure, $httponly);
?>

Clear Shopping Cart

Mage::getSingleton('checkout/cart')->truncate();

Clear Checkout Session

Mage::getSingleton('checkout/session')->clear();