What Are The Different Wait Types In SQL Server?

What is Cxconsumer wait type?

CXPACKET (Class Exchange Packet) is a wait type that generally reported by SQL Server when SQL Server execute queries using Parallelism.

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What are cursors in SQL?

A cursor holds the rows (one or more) returned by a SQL statement. The set of rows the cursor holds is referred to as the active set. You can name a cursor so that it could be referred to in a program to fetch and process the rows returned by the SQL statement, one at a time.

What is Lck_m_ix?

Description. This wait occurs when a request is waiting to acquire an intent exclusive lock. These locks are required to protect the object or data from other requests. This wait typically occurs while read and modify requests are being blocked by other write transactions (implicit or explicit)

What is option Maxdop 1 in SQL Server?

The MAXDOP setting limits the amount of CPUs used by one query in your SQL server instance. For example: if you put your MD to 2, then the query receives the option to create a parallel plan with 2 cores to execute a query. Fortunately, in SQL Server 2016 you can do this on database level.

What are the different types of functions in SQL Server?

There are three types of user-defined functions in SQL Server:Scalar Functions (Returns A Single Value)Inline Table Valued Functions (Contains a single TSQL statement and returns a Table Set)Multi-Statement Table Valued Functions (Contains multiple TSQL statements and returns Table Set)

What is Async_network_io wait type?

ASYNC_NETWORK_IO—The async_network_io wait types point to network-related issues. They are most-often caused by a client application not consuming and processing results from the SQL Server quickly enough.

What is Memory_allocation_ext?

The MEMORY_ALLOCATION_EXT wait is for a preemptive memory allocation during the execution.

What is difference between stored procedure and function?

The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values. Functions can have only input parameters for it whereas Procedures can have input or output parameters. Functions can be called from Procedure whereas Procedures cannot be called from a Function.

What is Cxpacket wait?

The SQL Server CXPACKET wait type is a result of parallel query execution and indicates that a session is waiting for the synchronization of threads involved in the parallel process to complete. … CXPACKET indicates the operation of multiple parallel CPUs, each executing a portion of the query.