Contents
What are Oracle Streams for?
Oracle Streams provides a flexible infrastructure that meets a wide variety of information sharing needs. Oracle Streams enables the propagation of data, transactions and events in a data stream either within a database, or from one database to another.
How do Oracle Streams work?
Oracle Streams capture processes, synchronous captures, propagations, apply processes, and messaging clients perform actions based on rules. You specify which events are captured, propagated, applied, and dequeued using rules, and a built-in rules engine evaluates events based on these rules.
How do streams work internally?
A stream pipeline is built by constructing a linked-list representation of the stream source and its intermediate operations. In the internal representation, each stage of the pipeline is described by a bitmap of stream flags that describe what’s known about the elements at this stage of the stream pipeline.
What would you use while processing a stream to replace every element in a stream with a different value?
In a nutshell, flatMap lets you replace each value of a stream with another stream, and then it concatenates all the generated streams into one single stream. Note that flatMap is a common pattern.
What is Oracle streams replication?
Overview of Oracle Streams Replication. Replication is the process of sharing database objects and data at multiple databases. In an Oracle Streams replication environment, the database where a change originates is called the source database, and a database where a change is shared is called a destination database.
How does CDC work in Oracle?
Change Data Capture efficiently identifies and captures data that has been added to, updated, or removed from, Oracle relational tables, and makes the change data available for use by applications. Change Data Capture is provided as an Oracle database server component with Oracle9i.
How do streams work?
Streams are actually a sequence of data being moved from one point to the another, but they’re computed on demand. So, they have at least one source, like arrays, lists, I/O resources, and so on. Fortunately, a stream can read/write data chunk by chunk, without buffering the whole file at once.
Why do we need stream API?
Introduced in Java 8, the Stream API is used to process collections of objects. A stream is a sequence of objects that supports various methods which can be pipelined to produce the desired result. A stream is not a data structure instead it takes input from the Collections, Arrays or I/O channels.
How do I use distinct in stream?
distinct() returns a stream consisting of distinct elements in a stream. distinct() is the method of Stream interface. This method uses hashCode() and equals() methods to get distinct elements. In case of ordered streams, the selection of distinct elements is stable.
What is replication stream?
Overview of Streams Replication. Replication is the process of sharing database objects and data at multiple databases. In a Streams replication environment, the database where a change originates is called the source database, and a database where a change is shared is called a destination database.
What is Oracle Golden Gate?
Oracle GoldenGate is a software product that allows you to replicate, filter, and transform data from one database to another database. Oracle GoldenGate enables you to replicate data between Oracle databases to other supported heterogeneous database, and between heterogeneous databases.
How are Oracle Streams used to share information?
Oracle Streams enables information sharing. Using Oracle Streams, each unit of shared information is called a message, and you can share these messages in a stream. The stream can propagate information within a database or from one database to another. The stream routes specified information to specified destinations.
Is there a deprecated version of Oracle Streams?
Oracle Streams was deprecated in Oracle Database 12c (12.1). It does not support features introduced in Database version 12.1 and later releases, including the multitenant architecture, the LONG VARCHAR data type, long identifiers, and other features.
What kind of streaming service does Oracle offer?
The Oracle Cloud Infrastructure Streaming service provides a fully managed, scalable, and durable solution for ingesting and consuming high-volume data streams in real-time.
How are data streams handled in JDBC-Oracle?
This chapter describes how the Oracle Java Database Connectivity (JDBC) drivers handle Java streams for several data types. Data streams enable you to read LONG column data of up to 2 gigabytes (GB). Methods associated with streams let you read the data incrementally.