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Ans. String is immutable in java and stored in String pool. Once it's created it stays in the pool until unless garbage collected, so even though we are done with password it's available in memory for longer duration and there is no way to avoid it. It's a security risk because anyone having access to memory dump can find the password as clear text.
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Ans. Inner join is the intersection of two tables on the condition defined by the where clause i.e will get records from both tables matched by a column.
Outer join is the union of two tables i.e will get all records from both tables and will put null in the columns where related records are not present.
Left Outer join is the left union of two tables i.e all records from the table on the left and values from the right table for related records else null for the columns from right table.
Right Outer join is the right union of two tables i.e all records from the table on the right and values from the left table for related records else null for the columns from left table.
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Ans. Product refer to category of Items and hence can't be associated to a particular Stock keeping unit. Items can only be targeted while creating promotions.
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Ans. The Marketing subsystem is a component of the WebSphere Commerce Server, and provides numerous marketing concepts to your site, designed to increase brand awareness, and to attract and retain customers. Components of the marketing subsystem provide functionality to create marketing campaigns, including customer segments and advertising; and e-mail activities.
Various components are -
1. Promotions
2. Auctions
3. eSpots
4. e Mail Campaigns
5. Hubs and Extended sites for affiliates
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java string class string immutable immutability string pool garbage collection advanced 
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