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| Section | Weight | Objectives |
|---|---|---|
| Database Fundamentals | 24% | - Database structure types and characteristics - SQL development, modification, and execution - Impact of programming on database operations - Scripting methods and environments |
| Database Deployment | 16% | - Implementation, testing, and deployment phases - Database planning and design considerations - Migration and integration strategies |
| Business Continuity | 12% | - Disaster recovery planning and strategies - Backup and restoration methods - High availability and fault tolerance - RTO and RPO definitions and application |
| Database Management and Maintenance | 25% | - Data lifecycle management - Performance monitoring and reporting - Documentation and configuration management - Routine maintenance processes and tasks |
| Data and Database Security | 23% | - Authentication, authorization, and access control - Attack types and defense measures - Data security concepts and techniques - Infrastructure security and threat mitigation - Governance, risk, and compliance |
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NEW QUESTION # 13
A data analyst would like to select only one copy of each of the duplicated regions in the chart below:
Which of the following SQL commands should the data analyst use to complete this task?
Answer: A
Explanation:
The SELECT DISTINCT command retrieves unique values from a column, allowing the analyst to select only one copy of each duplicated region.
NEW QUESTION # 14
Which of the following is an advantage of creating indexes?
Answer: C
Explanation:
The advantage of creating indexes is to provide quick and efficient access to data. An index is a data structure that stores the values of one or more columns of a table in a sorted order, along with pointers to the corresponding rows in the table. An index helps to speed up queries that search, filter, sort, or join data based on the indexed columns, as it reduces the number of disk accesses or scans required to locate the desired data. An index also helps to enforce uniqueness or referential integrity constraints on the indexed columns. The other options are either not true or not relevant for this purpose. For example, an index does not help with space allocation, as it consumes additional space in the database; an index does not reduce memory, as it may use memory for caching or buffering purposes; an index does not update the query plan, as it is an input or a factor for the query optimizer to generate the query plan. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 15
Which of the following resources is the best way to lock rows in SQL Server?
Answer: C
Explanation:
The resource that is the best way to lock rows in SQL Server is RID. RID, or Row IDentifier, is an attribute that uniquely identifies each row in a heap table in SQL Server. A heap table is a table that does not have a clustered index, which means that the rows are not stored in any particular order. A RID consists of the file number, page number, and slot number of the row in the database. A RID can be used to lock rows in SQL Server to prevent concurrent access or modification by other transactions or users. A RID lock is a type of lock that locks a single row using its RID. A RID lock can be applied using the HOLDLOCK or XLOCK hints in a SELECT statement. The other options are either not related or not effective for this purpose. For example, TID, or Transaction IDentifier, is an attribute that uniquely identifies each transaction in a database; SID, or Security IDentifier, is an attribute that uniquely identifies each user or group in a Windows system; PID, or Process IDentifier, is an attribute that uniquely identifies each process in an operating system. References: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.3 Given a scenario, implement database concurrency methods.
NEW QUESTION # 16
A server administrator wants to analyze a database server's disk throughput. Which of the following should the administrator measure?
Answer: A
Explanation:
The factor that the administrator should measure to analyze a database server's disk throughput is IOPS. IOPS, or Input/Output Operations Per Second, is a metric that measures the number of read and write operations that a disk can perform in one second. IOPS indicates the performance or speed of a disk and how well it can handle multiple requests or transactions. Higher IOPS means higher disk throughput and lower latency. IOPS can be affected by various factors, such as disk type, size, speed, cache, RAID level, etc. The other options are either not related or not sufficient for this purpose. For example, RPfvl is not a valid acronym or metric; latency is the time delay between a request and a response; reads are the number of read operations performed by a disk.
NEW QUESTION # 17
A new retail store employee needs to be able to authenticate to a database. Which of the following commands should a database administrator use for this task?
Answer: A
Explanation:
The command that the database administrator should use for this task is CREATE USER. The CREATE USER command is a SQL statement that creates a new user account in a database and assigns it a username and a password. The CREATE USER command also allows the database administrator to specify other options or attributes for the user account, such as default tablespace, quota, profile, role, etc. The CREATE USER command is the first step to enable a user to authenticate to a database. The other options are either invalid or not suitable for this task. For example, INSERT USER is not a valid SQL command; ALLOW USER is not a SQL command, but a keyword used in some database systems to grant permissions to users; ALTER USER is a SQL command that modifies an existing user account, but does not create a new one. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
NEW QUESTION # 18
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