This is not an exhaustive list; additional resources are referenced within objectives below.
|Explain the significance of record IDs.||Record IDs|
[Should / Short / CertifiedOnDemand.com]
How unique IDs work in Salesforce
[Should / Medium / Salesforce.com]
Salesforce IDs - A Riddle Solved with CASESAFEID()
[Could / Medium / opfocus.com]
|Each record in Salesforce is assigned a unique ID (its primary key within Salesforce), which is commonly referenced when manipulating data.
There are two versions of the ID:
1. The 15 character ID (case sensitive), which is displayed in the user interface.
2. The 18 character ID, which is returned via the API by default. The 18 character ID is a combination of the 15 character ID with 3 characters added to ensure that it is unique on a case insensitive basis (this is to support legacy applications).
The CASESAFEID function can be used to derive the 18 digit ID within a formula field.
|Explain how the recycle bin can be used to recover deleted records.||Using the Recycle Bin|
[Should / Short / Salesforce.com]
|Deleted records are stored in your organization's recycle bin for 15 days before they are permanently erased. The number of records your recycle bin can store is limited to 25 times your storage limit in MB (e.g. if you have 1000 MB of data storage, the maximum number of records your recycle bin will hold is 25,000). If this limit is exceeded, then Salesforce automatically purges the oldest records in the recycle bin if they have been in the recycle bin for at least two hours.
Users can restore records they have deleted. System administrators can restore records deleted by any user.