Which of the following occurs when two connections need access to same piece of data concurrently and the meanwhile another is blocked because at a particular time, only one connection can have access?

SQL Server performance tuning is a set of processes and procedures that help optimize relational database queries. The goal is to make queries run as efficiently as possible.  Here are some tips for SQL query optimization: Consider usage: Consider the number of tables, size, and execution plan of a query. Understand performance metrics: Consider statistics, resource allocation, and other performance metrics. Improve indexes: Indexes allow the database to retrieve specific data without scanning the entire table. When used properly, indexes can improve query response time. Use the TempDB... Show more

SQL Server performance tuning is a set of processes and procedures that help optimize relational database queries. The goal is to make queries run as efficiently as possible. 

Here are some tips for SQL query optimization:
Consider usage: Consider the number of tables, size, and execution plan of a query.
Understand performance metrics: Consider statistics, resource allocation, and other performance metrics.
Improve indexes: Indexes allow the database to retrieve specific data without scanning the entire table. When used properly, indexes can improve query response time.
Use the TempDB system database: The TempDB system database stores different types of user database objects and system internal objects. This speeds up SQL Server Database Engine related processes. 

Other tips for SQL Server performance tuning include:
Identifying which queries are experiencing slowdowns
Optimizing queries for maximum efficiency
Fine-tuning queries
Writing appropriate T-SQL queries
Implementing indexes 

SQL Query Analyzer is a service that can help improve query performance and identify why some queries never complete.

SQL Server Performance Tuning and Optimization topics include: Query execution plan, indexing strategies, query plan reuse, transactions, locking and blocking, transaction log, data compression, partitioning and resource governor.

Related: SQL Server Practice Test: Monitoring and Auditing

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