Adhesive Non Skid Tape- A Safety Measure
An adhesive non skid tape is considered to be a great tool for maintaining safety and reducing liability in any industrial environment. It proves to be very useful at workplaces that are prone to moisture or spills. It is specially designed to alleviate slippery surfaces. An adhesive non skid tape is something that is a cost- effective means to avoid any kind of injury and lawsuits.
While choosing any type of adhesive tape, you must keep your application in mind. Specifically, the adhesive non skid tape should be used to mark potentially dangerous areas in your area of work.
It can be used for following reasons:
The safety tape must be used to drawl the edges of steps and to prevent falls.
The use of a reflective safety tape can illuminate danger spots which can save an unforeseen accident.
Configure MySql .Net Connector with Entity Framework
To communicate from .NET code to MySQL database using Entity Framework we installed MySql .NET Connector. It worked fine out of the box on developer's workstations but once deployed to hosted web server application started to throw following error:
[NotSupportedException: Unable to determine the provider name for connection of type 'MySql.Data.MySqlClient.MySqlConnection'.] System.Data.Entity.ModelConfiguration.Utilities.DbConnectionExtensions.GetProviderInvariantName(DbConnection connection)
System.Data.Entity.ModelConfiguration.Utilities.DbConnectionExtensions.GetProviderInfo(DbConnection connection, DbProviderManifest& providerManifest)
System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)
System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)
System.Data.Entity.DbSet`1.Add(TEntity entity)
Apparently, somehow MySQL .NET provider was not registered on server although installation was done properly and all assemblies were present in GAC. Since on shared hosting we did not have access to machine.config by adding the same registration entry to the application web.config file resolved the issue:
<system.data>
<DbProviderFactories>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.4.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"/>
</DbProviderFactories>
</system.data>
Important: 1) Make sure to register the same version that is installed on the server 2) Provide precise fully qualified name in the type attribute. For example, adding extra space between MySql.Data.MySqlClient.MySqlClientFactory and MySql.Data will make this entry useless and will result in the same error
Volatile Fields
Software built on the .NET framework is subject to many optimisations. Some optimisation is performed when compiling your program or library in Visual Studio or using the command-line compiler. Other optimisations are applied when executing the compiled intermediate language (IL) code. These vary according to the type of processor used to run the program. In many situations these optimisations lead to faster code or smaller programs without any noticeable side effects.
One optimisation that can have side effects relates to publicly visible fields in classes or structures. When you request the value of such a field the program normally performs a non-volatile read. This type of read can be optimised to improve the performance of the program. For example, the processor may choose to read the value from memory earlier than expected, and potentially in a different order than specified, in preparation for its later use. This may move the value to the processor's cache memory, where it can be accessed more quickly than from the main memory, or to its registers for yet faster performance. In single-threaded code these changes are unnoticeable.
When you are creating a multithreaded application or one that uses parallel programming code, non-volatile reads can present a problem. To illustrate this, consider the following program:
Interview Questions on Networking
What are the factors that affect the performance of NIC?
The following factors affect the performance of NIC,
Bus Speed :- It depends on ISA or PCI slot. PCI has higher speed.
Memory :- More the memory, better the performance.
Memory Access Method :- DMA is faster than I/O method.
What is datagram in a TCP/IP network?
At the network layer of TCP/IP model the data unit created is called the 'datagram '.
ST connectors or SMA connectors are used with which type of cable?
NOTE: This is objective type question, Please click question title for correct answer.
What is a Passive Hub?
Passive hub is a type of hub that do not provide the amplification of signals.
These hub also do not require any external electrical supply.
What are different switching methods used by a switch to send data?
Switch adopts two methods for sending data,
Cut Through Switching:-
In this method of switching data frames are send to the destination computer without error and integrity checking.
Store and Forward Switching:-
In this method the switch sends the data frames after receiving all the frames well as after error and integrity checking.
How to use performance monitor to diagnose bottlenecks in your application?
Monitor is a tool built to assist you in diagnosing the problem.
Type ‘perfmon’ in command prompt to access Performance Monitor
The counters, sampling intervals, etc can be used to monitor the performance.
A baseline should be established so that critical reference points, changes and trends can be observed and identified.
Results can be made more readable by removing all the distracting sample noise so that the graphical view of trend lines is not blurred. This can be done using buckets - a vertical line, indicating the minimum, average, and maximum of the sample points in the bucket.
It should be noted that the bottlenecks can be caused due to over utilization of physical disk, memory, process, CPU, and network.
Whats the difference betweeen Structure, Class and Enumeration
Structures and Enumerations are Value-Types. This means, the data that they contain is stored as a stack on the memory. Classes are Reference-Types, means they are stored as a heap on the memory.
Structures are implicitly derived from a class called System.ValueType. The purpose of System.ValueType is to override the virtual methods defined by System.Object. So when the runtime encounters a type derived from System.ValueType, then stack allocation is achieved. When we allocate a structure type, we may also use the new keyword. We may even make a constructor of a structure, but, remember, A No-argument constructor for a structure is not possible. The structure's constructor should always have a parameter.
So if we define the following structure
struct MyStruct
{
public int y,z;
}
and we create a structure type
MyStruct st = new MyStruct();
In case of a class, no-argument constructors are possible. Class is defined using the class keyword.
A struct cannot have an instance field, whereas a class can.
class A
{
int x = 5; //No error
...
}
struct
{
int x = 5; //Syntax Error
}
A class can inherit from one class (Multiple inheritance not possible). A Structure cannot inherit from a structure.
Enum is the keyword used to define an enumeration. An enumeration is a distinct type consisting of a set of named constants called the enumerator list. Every enumeration has an underlying type. The default type is "int". Note: char cant be the underlying data type for enum. First value in enum has value 0, each consequent item is increased by 1.
enum colors {red, green, blue, yellow};
Here, red is 0, green is 1, blue is 2 and so on.
An explicit casting is required to convert an enum value to its underlying type
int x = (int)colors.yellow;
Explain the concepts of CTS and CLS(Common Language Specification).
CTS
When different languages are integrated and want to communicate, it is certain that the languages have their own data types and different declaration styles. CTS define how these different variables are declared and used in run time. E.g. VB offers an Integer data type while C++ offers long data type. Using CTS, these data types are converted to System32 which itself a data type of CLS.
CLS
Any language(s) that intend to use the Common Language Infrastructure needs to communicate with other CLS-Compliant language. This communication is based on set of rules laid by CLS. These rules define a subset of CTS.
Data Dictionary Queries for Oracle
For ORACLE
select * from sys.dba_objectswhere owner = 'scott'and object_type='TABLE'
SELECT owner, object_name, object_type FROM sys.dba_objectswhere object_type='SEQUENCE' and owner='scott';
