The document discusses several database concepts including database snapshots, replication, and mirroring. It defines a database snapshot as a read-only view of a database. Database replication transfers data between servers, while database mirroring increases availability. The document also discusses partitioning tables, file groups, shrinking databases, constraints, and other SQL Server tools and functions.

1. 1 ថនសារិ
II. Drawing diagrams as below:
1. DB snapshot
2. DB Replication

2. 2 ថនសារិ
3. DB Mirroring
IV. Giving the definition:
1. Database snapshot is a read-only, static view of a SQL Server database (the source database).
1.1 Attach is can attach a copied or detached SQL Server database
1.2 Detaching a database removes it from the instance of SQL Server but leaves the database
intact within its data files and transaction log files

3. 3 ថនសារិ
1.3 Database authentication is the process or act of confirming that a user who is attempting to
log in to a database
1.4 Authorization is the process of giving someone permission to do or have something
2. Database replication is a tool for transfer data from one server to other server.
2.1 Database mirroring is a solution for increasing the availability of a SQL Server database
2.2 Partition Table is the database process where very large tables are divided into multiple
smaller parts
2.3 File Group is tools that used to increase database in order to make it can store too much
data.
2.4 Shrinking database it mean each file within a database can be reduced to remove unused
pages
2.5 Intersect is used to return the results of 2 or more SELECT statement
3. EXCEPT operator is used to return all rows in the first SELECT statement that are not returned by
the second SELECT statement
3.1 NO ACTION is a deferred check, so NO ACTION is the same as RESTRICT
3.2 Constraints are the rules enforced on data columns on table