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The stream returns the change data capture records. If the stream is used in a DML statement. Update rows in table t1. Query stream s1. Returns the same state of stream when it was used at Time 2.

Commit transaction. If the stream was consumed in DML statements within the transaction, the stream position advances to the transaction start time.

Results include table changes committed by Transaction 1. Within Transaction 1, all queries to stream s1 see the same set of records. DML changes to table t1 are recorded to the stream only when the transaction is committed.

In Transaction 2, queries to the stream see the changes recorded to the table in Transaction 1. Note that if Transaction 2 had begun before Transaction 1 was committed, queries to the stream would have returned a snapshot of the stream from the position of the stream to the beginning time of Transaction 2 and would not see any changes committed by Transaction 1.

A stream stores data in the same shape as the source table i. Note that streams record the differences between two offsets.

If a row is added and then updated in the current offset, the delta change is a new row. Specifies the unique and immutable ID for the row, which can be used to track changes to specific rows over time.

A standard i. This stream type performs a join on inserted and deleted rows in the change set to provide the row level delta. As a net effect, for example, a row that is inserted and then deleted between two transactional points of time in a table is removed in the delta i.

An append-only table stream tracks row inserts only. Update and delete operations including table truncates are not recorded.

For example, if 10 rows are inserted into a table and then 5 of those rows are deleted before the offset for an append-only stream is advanced, the stream records 10 rows.

An append-only stream returns the appended rows only and therefore can be much more performant than a standard stream for extract, load, transform ELT and similar scenarios that depend exclusively on row inserts.

For example, the source table can be truncated immediately after the rows in an append-only stream are consumed, and the record deletions do not contribute to the overhead the next time the stream is queried or consumed.

Supported on external tables only. An insert-only stream tracks row inserts only; they do not record delete operations that remove rows from an inserted set i.

For example, in-between any two offsets, if File1 is removed from the cloud storage location referenced by the external table, and File2 is added, the stream returns records for the rows in File2 only.

Unlike when tracking CDC data for standard tables, Snowflake cannot access the historical records for files in cloud storage. Overwritten files are essentially handled as new files: The old version of the file is removed from cloud storage, but the insert-only stream does not record the delete operation.

The new version of the file is added to cloud storage, and the insert-only stream records the rows as inserts. The stream does not record the diff of the old and new file versions.

Support for insert-only table streams is provided as a preview feature. The following diagram shows how the contents of a standard table stream change as rows in the source table are updated.

Whenever a DML statement consumes the stream contents, the stream position advances to track the next set of DML changes to the table i.

A stream becomes stale when its offset is outside of the data retention period for its source table. When a stream becomes stale, the historical data for the source table is no longer accessible, including any unconsumed change records.

To prevent a stream from becoming stale, consume the stream records within a transaction during the retention period for the table.

If the data retention period for a source table is less than 14 days , and a stream has not been consumed, Snowflake temporarily extends this period to prevent it from going stale.

When the stream is consumed, the extended data retention period is reduced to the default period for the table. Currently, when a database or schema that contains a source table and stream is cloned, any unconsumed records in the stream in the clone are inaccessible.

For example, a custom rule-based transformation can change the data type of a particular column in an LCR. During enqueue of a message by a capture process , which can be useful for formatting a message in a manner appropriate for all destination database s.

During propagation of a message, which can be useful for transforming a message before it is sent to a specific remote site.

During dequeue of a message by an apply process or messaging client , which can be useful for formatting a message in a manner appropriate for a specific destination database.

When a transformation is performed during apply, an apply process can apply the transformed message directly or send the transformed message to an apply handler for processing.

A rule must be in a positive rule set for its rule-based transformation to be invoked. A rule-based transformation specified for a rule in a negative rule set is ignored by capture process es, propagation s, apply process es, and messaging client s.

Throughout this document, "rule-based transformation" is used when the text applies to both declarative and custom rule-based transformations.

This document distinguishes between the two types of rule-based transformations when necessary. Every redo entry in the redo log has a tag associated with it.

The data type of the tag is RAW. By default, when a user or application generates redo entries, the value of the tag is NULL for each redo entry, and a NULL tag consumes no space in the redo entry.

The size limit for a tag value is bytes. In Oracle Streams, rule s can have conditions relating to tag values to control the behavior of Oracle Streams client s.

For example, a tag can be used to determine whether an LCR contains a change that originated in the local database or at a different database, so that you can avoid change cycling sending an LCR back to the database where it originated.

Also, a tag can be used to specify the set of destination database s for each LCR. Tags can be used for other LCR tracking purposes as well.

You can specify Oracle Streams tags for redo entries generated by a certain session or by an apply process. These tags then become part of the LCRs captured by a capture process or synchronous capture.

Typically, tags are used in Oracle Streams replication environments, but you can use them whenever it is necessary to track database changes and LCRs.

In addition to information sharing between Oracle databases, Oracle Streams supports heterogeneous information sharing between Oracle databases and non-Oracle databases.

Oracle Streams can capture data manipulation language DML and data definition language DDL changes made to database objects and replicate those changes to one or more other databases.

An Oracle Streams capture process or synchronous capture captures changes made to source database objects and formats them into LCRs, which can be propagated to destination database s and then applied by Oracle Streams apply process es.

The destination databases can allow DML and DDL changes to the same database objects, and these changes might or might not be propagated to the other databases in the environment.

In other words, you can configure an Oracle Streams environment with one database that propagates changes, or you can configure an environment where changes are propagated between databases bidirectionally.

Also, the tables for which data is shared do not need to be identical copies at all databases. Both the structure and the contents of these tables can differ at different databases, and the information in these tables can be shared between these databases.

Data warehouse loading is a special case of data replication. Some of the most critical tasks in creating and maintaining a data warehouse include refreshing existing data, and adding new data from the operational databases.

Oracle Streams components can capture changes made to a production system and send those changes to a staging database or directly to a data warehouse or operational data store.

Oracle Streams capture of redo data with a capture process avoids unnecessary overhead on the production systems. Support for data transformations and user-defined apply procedures enables the necessary flexibility to reformat data or update warehouse-specific data fields as data is loaded.

In addition, Change Data Capture uses some of the components of Oracle Streams to identify data that has changed so that this data can be loaded into a data warehouse.

Oracle Database Data Warehousing Guide for more information about data warehouses. You can use the features of Oracle Streams to achieve little or no database down time during database upgrade and maintenance operations.

Maintenance operations include migrating a database to a different platform, migrating a database to a different character set, modifying database schema objects to support upgrades to user-created applications, and applying an Oracle software patch.

Oracle Streams Advanced Queuing AQ enables user applications to enqueue message s into a queue , propagate messages to subscribing queues, notify user applications that messages are ready for consumption , and dequeue messages at the destination.

Oracle Streams AQ supports all the standard features of message queuing systems, including multiconsumer queues, publish and subscribe, content-based routing, Internet propagation, transformations, and gateways to other messaging subsystems.

You can create a queue at a database, and applications can enqueue messages into the queue explicitly. Subscribing applications or messaging client s can dequeue messages directly from this queue.

If an application is remote, then a queue can be created in a remote database that subscribes to messages published in the source queue.

The destination application can dequeue messages from the remote queue. Alternatively, the destination application can dequeue messages directly from the source queue using a variety of standard protocols.

Business events are valuable communications between applications or organizations. An application can enqueue message s that represent events into a queue explicitly, or an Oracle Streams capture process or synchronous capture can capture database events and encapsulate them into messages called LCRs.

Propagations can propagate messages in a stream through multiple queues. Finally, a user application can dequeue messages explicitly, or an Oracle Streams apply process can dequeue messages implicitly.

An apply process can reenqueue these messages explicitly into the same queue or a different queue if necessary.

You can configure queues to retain explicitly-enqueued messages after consumption for a specified period of time. Oracle Streams AQ stores all messages in the database in a transactional manner, where they can be automatically audited and tracked.

You can use this audit trail to extract intelligence about the business operations. Oracle Streams capture processes, synchronous captures, propagation s, apply processes, and messaging client s perform actions based on rule s.

You specify which events are captured, propagated, applied, and dequeued using rules, and a built-in rules engine evaluates events based on these rules.

The ability to capture events and propagate them to relevant consumers based on rules means that you can use Oracle Streams for event notification.

Messages representing events can be staged in a queue and dequeued explicitly by a messaging client or an application, and then actions can be taken based on these events, which can include an e-mail notification, or passing the message to a wireless gateway for transmission to a cell phone or pager.

One solution for data protection is to create a local or remote copy of a production database. In the event of human error or a catastrophe, the copy can be used to resume processing.

You can use Oracle Data Guard SQL Apply, a data protection feature that uses some of the same infrastructure as Oracle Streams, to create and maintain a logical standby database, which is a logically equivalent standby copy of a production database.

As in the case of Oracle Streams replication , a capture process captures changes in the redo log and formats these changes into LCRs.

These LCRs are applied at the standby databases. Therefore, these standby databases can be queried as updates are applied. It is important to move the updates to the remote site as soon as possible with a logical standby database.

Doing so ensures that, in the event of a failure, lost transactions are minimal. By directly and synchronously writing the redo logs at the remote database, you can achieve no data loss in the event of a disaster.

At the standby system, the changes are captured and directly applied to the standby database with an apply process. Oracle Data Guard Concepts and Administration for more information about logical standby databases.

Figure shows a sample hub-and-spoke replication configuration. A hub-and-spoke replication configuration typically is used to distribute information to multiple target databases and to consolidate information from multiple databases to a single database.

A hub-and-spoke replication configuration is one in which a central database, or hub, communicates with one or more secondary databases, or spokes.

The spokes do not communicate directly with each other. In a hub-and-spoke replication configuration, the spokes might or might not allow changes to the replicated database objects.

In the sample hub-and-spoke replication configuration shown in Figure , there is one hub database and two spoke databases. The spoke databases allow changes to the replicated database objects.

Figure shows a sample replication configuration that uses a downstream capture process. Downstream capture means that the capture process runs on a remote database instead of the source database.

Using downstream capture removes the capture workload from the production database. In the sample replication configuration shown in Figure , the downstream capture process runs at the remote database dest.

At the remote database, a downstream capture process captures the changes in the redo data sent from the source database and an apply process applies these changes to the local database objects.

Figure shows a sample replication configuration that uses synchronous captures to capture changes instead of capture processes.

You can use a synchronous capture replication configuration to replicate changes to tables with infrequent data changes in a highly active database or in situations where capturing changes from the redo logs is not possible.

Figure shows a sample n-way replication configuration. An n-way replication configuration typically is used in an environment with several peer databases and each database must replicate data with each of the other databases.

An n-way replication configuration can provide load balancing, and it can provide failover protection if a single database becomes unavailable.

An n-way replication configuration is one in which each database communicates directly with each other database in the environment.

The changes made to replicated database objects at one database are captured and sent directly to each of the other databases in the environment, where they are applied.

In the sample n-way replication configuration shown in Figure , each of the three databases captures changes to the replicated database objects and sends these changes to the other two databases in the configuration.

Apply processes at each database apply the changes sent from the other two databases. Figure shows a sample configuration that captures database changes with a capture process and applies these changes with an apply process in a single database.

In this configuration, the apply process reenqueues the changes into the queue for processing by an application.

Also, a DML handler inserts rows that were deleted from the hr. Figure shows a sample messaging configuration.

A messaging configuration sends messages from one queue to another queue. The two queues can be in the same database or in different databases.

The messages can be dequeued and processed by applications in a customized way. In the sample messaging configuration shown in Figure , a trigger at one database creates and enqueues messages.

Several tools are available for configuring, administering, and monitoring your Oracle Streams environment.

Additionally, Oracle Streams data dictionary views keep you informed about your Oracle Streams environment. This package includes procedures that enable you to configure apply handler s, set enqueue destinations for messages, and specify execution directives for messages.

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