Specify an existing Windows account to be used by SharePoint Server Central Administration tasks to access and modify settings ...

Specify an existing Windows account to be used by SharePoint Server Central Administration tasks to access and modify settings in the configuration database. The following user rights are granted automatically to this account: Replace a process level token, Adjust memory quotas for a process, and Log on as a service. 

Note: Specifying a new account does not revoke security rights from the existing account. For more information, see the Microsoft SharePoint Server 2013  Administrator's Guide. 

Important: Changing the configuration database administration account requires you to retype the password for the default content access account and for all rules that include or exclude content. Otherwise crawls will fail.

Specify an account to use as the default account when crawling content. This account must have read access to the content ... Specify an author for this location. The author can be an individual or a company. If you share this location with others ... Specify an e-mail address that external site administrators can contact if problems arise when SharePoint Server crawls their ... Specify an e-mail address that external site administrators can contact if problems arise when their site is being crawled. ... Specify an existing Windows account to be used by SharePoint Server Central Administration tasks to access and modify settings ... Specify an optional version number for this location. If you enter a value, it must contain at least one period (".").Note: ... Specify columns to be represented in the Calendar Views. The Title fields are required fields. The Sub Heading fields are ... Specify columns to be represented in the Gantt chart. Start Date and Due Date are required date fields. Title is a required ... Specify database connection settings for this content database. Use the Database status options to control whether or not ...