Table of Contents
- 1 What is difference between persistent object and non persistent object?
- 2 What is difference between transient persistent and detached object in hibernate?
- 3 What is the difference between persistent and non-persistent data?
- 4 What is persistent and non-persistent data?
- 5 What is meant by persistent data?
- 6 What is persistent data example?
- 7 Can a persistent database contain both transient and persistent objects?
- 8 What is the definition of a persistent object?
What is difference between persistent object and non persistent object?
Differentiate persistent & non-persistent objects? Persistent refers to an object’s ability to transcend time or space. A persistent object stores/saves its state in a permanent storage system with out losing the information represented by the object. A non-persistent object is said to be transient or ephemeral.
What is difference between transient persistent and detached object in hibernate?
Hibernate defines and supports the following object states: Transient – an object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session . Detached – a detached instance is an object that has been persistent, but its Session has been closed.
What is a difference between transient memory devices and persistent storage devices?
A transient database object exists only as long as an application has an open connection to the database. All transient objects disappear when the application shuts down the database. A persistent database object resides on a persistent storage device, usually a Hard Disk Drive (HDD) or Solid State Drive (SSD).
How do you make a transient object persistent?
When the object is in persistent state, then it represent one row of the database and consists of an identifier value. You can make a transient instance persistent by associating it with a Session.
What is the difference between persistent and non-persistent data?
Persistence is a property of a an individual message. The main difference is that if you are using persistent delivery, messages are persisted to disk/database so that they will survive a broker restart. When using non-persistent delivery, if you kill a broker then you will lose all in-transit messages.
What is persistent and non-persistent data?
Persistence data: The data which is available after fully closing the application. This type of data must be save into shared preference or database or internal or external memory. Non- persistence data: The data which is not available after fully closing the application.
What is meant by persistent object in hibernate?
Persistent objects are instances of POJO classes that you create that represent rows in the table in the database. According to hibernate-doc an instance of POJO class representing table in database goes through 3 states of which persistent is one of them.
What is transient object in hibernate?
An object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session. It has no persistent representation in the database and no identifier value has been assigned.
What is meant by persistent data?
Persistent data in the field of data processing denotes information that is infrequently accessed and not likely to be modified. Static data is information, for example a record, that does not change and may be intended to be permanent. It may have previously been categorized as persistent or dynamic.
What is persistent data example?
Persistent, or non-volatile data, is not accessed very frequently and is recoverable if there was ever a power interruption. Examples include ROM (read-only memory), flash memory and ferroelectric RAM.
What is persistent object in database?
A persistent object is an object that has been assigned a storage location in a federated database. When you commit the transaction in which you create a persistent object, that object’s data is saved in the database; the object can then be accessed by other processes.
What is persistent data?
Can a persistent database contain both transient and persistent objects?
Persistent databases can contain only persistent objects or it is possible to create hybrid databases which contain both transient and persistent objects. The transient objects have transient indexes and persistent objects have persistent indexes. This means that a persistent database does not need to be re-indexed after re-opening.
What is the definition of a persistent object?
Persistent – An object that has a database identity associated with it is called a persistent object. A persistent instance has a representation in the database and an identifier value. It might just have been saved or loaded; however, it is by definition in the scope of a Session.
Which is an example of a transient object?
Persistent objects are available to the user until they are deleted explicitly. They can be implemented as tables, columns or attributes. Transient object exists only within the scope of the PL/SQL block. These get automatically de-allocated once they go out of the scope of the PL/SQL block. Examples of transient objects are PL/SQL variables.
When does an object become transient in hibernate?
An object is transient if it has just been instantiated using the new operator, and it is not associated with a Hibernate Session. It has no persistent representation in the database and no identifier value has been assigned. Transient instances will be destroyed by the garbage collector if the application does not hold a reference anymore.