{"id":7114,"date":"2021-03-29T10:55:54","date_gmt":"2021-03-29T10:55:54","guid":{"rendered":"https:\/\/www.gologica.com\/elearning\/?p=7114"},"modified":"2025-04-07T10:21:51","modified_gmt":"2025-04-07T10:21:51","slug":"oracle-stream-interview-questions","status":"publish","type":"post","link":"https:\/\/www.gologica.com\/elearning\/oracle-stream-interview-questions\/","title":{"rendered":"Oracle Stream Interview Questions"},"content":{"rendered":"

1. What is Oracle Streams?<\/strong><\/p>\n

The Oracle streams products from Oracle Corporation and encourages users of Oracle databases to propagate information within and between databases.<\/p>\n

It provides tools to capture, process (stage), and manage database events through Advanced Queuing queues.<\/p>\n

2. What Is Streams Pool In Oracle 10g?<\/strong><\/p>\n

Streams pool is a part of the System’s Global Area (SGA) from which memory for Streams is allocated if it is configured. It can be configured by specifying the initialization parameter, STREAMS_POOL_SIZE.<\/p>\n

If the size of the Streams pool is greater than zero, then any SGA memory used by Stream is allocated from the Streams pool.<\/p>\n

If the size of the Stream pool is equal to zero, then the memory used by Streams is allocated from the shared pool that may use up to 10% of the shared pool.<\/p>\n

\n
\"ORACLE<\/a><\/figure>\n<\/div>\n

3. What Is a Database Change Notification?<\/strong><\/p>\n

Database Change Notification is a service that is used to notify the registered clients whenever a change is committed.<\/p>\n

4. What is the difference between Oracle Streams and Change Data Capture?<\/strong><\/p>\n

Oracle CDC is all about capturing changes in DB tables and the changes are stored in special Oracle tables. There are two modes of CDC operation: asynchronous (based on Java) and synchronous. Oracle Streams sits on top of Oracle CDC and it’s a full transport mechanism for data synchronization between 2 servers. It’s based on Oracle Advanced Queues technology and it’s designed for high performance and reliability.<\/p>\n

Both Oracle CDC and Streams are generally used for data synchronization between Oracle DB servers. With Oracle CDC, you don’t have to use Oracle Streams for, e.g. you could write your data export routines which create flat files for synchronization between 2 DB servers, whereas with Streams you must have a network link between the 2 servers.<\/p>\n

Database Change Notification is something else again, it’s not used for server-to-server sync but instead more for server notification of result set changes to clients, mostly in the context of data caches on the client side.<\/p>\n<\/p>\n

\n\n\n\n
Learn more information from the GoLogica “Oracle Stream Training<\/a>“<\/em><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n

5. What is Stream Replication?<\/strong><\/p>\n

Oracle streams extract changes from transaction (redo) logs to propagate them to the destination database.\u00a0 It relies on the methodology of redoing log files for the database changes.\u00a0 The db transactions are recorded in the redo logs files, which are extracted by the log transport service.\u00a0 It can act as a DR solution.\u00a0 Since it is a pure data solution, data can be maintained as either a complete replica of the source database or as a subset of the data.\u00a0 It can be sent to multiple destinations.\u00a0 With the help of an application handler, you can have a variety of data transformations.<\/p>\n

6. What is LCR?<\/strong><\/p>\n

A message with a specific format that describes a database change.  All the captured changes are converted into events called LCR.<\/p>\n

7. What is the Capture Process?<\/strong><\/p>\n

The capture process is an Oracle background process that scans the database redo log files to extract the DML and DDL changes that were done on the database objects.\u00a0 It usually runs on the source database system where the actual transactional activity occurs.\u00a0 It is an optional background process whose process name is cnn, in which it is a capture process number.\u00a0 The infrastructure of LogMiner is used for this process.<\/p>\n

8. What is the Apply Process?<\/strong><\/p>\n

The apply process is an optional Oracle background process that dequeues LCRs and user messages from a specific queue.\u00a0 After that, it either applies each one directly or passes it to a user-defined procedure called a handler.\u00a0 The process name is Anna, and it is an Apply process number.<\/p>\n

9. What is SYS.AnyData?<\/strong><\/p>\n

Events of different data types can be captured into a SYS.AnyData queue.\u00a0 This is defined at the database level.\u00a0 The majority of the payload type can be wrapped in a SYS.AnyData queue.\u00a0 Users and applications may enqueue events into a SYS.AnyData.<\/p>\n

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\"ORACLE<\/a><\/figure>\n<\/div>\n

10. Why is additional supplemental logging needed?<\/strong><\/p>\n

When a particular column is updated at the source database table for a set of rows, the values in the column or columns are logged by default.\u00a0 When these values need to be applied on the destination side, where does Oracle apply them and how does Oracle identify which rows it need updating?\u00a0 Supplemental logging provides the answers to these questions.<\/p>\n

11. What is direct application? <\/strong><\/p>\n

Directly applying means that the application process is going to apply the LCR without having to run a user procedure. \u00a0 It is the simplest form of applying to the destination.<\/p>\n

12. What is downstream capture?<\/strong><\/p>\n

This is a feature that you can use to shift the capture process from the primary database to another server that is dedicated to just that purpose.\u00a0 If you use this, there is no additional resource that is utilized in the source database.\u00a0 All of the capture and enqueue activities are done on the downstream database.\u00a0 The use of this allows you more flexibility and improves scalability.<\/p>\n

13. What are the uses of streams?<\/strong><\/p>\n

Message Queuing<\/p>\n

Data Replication<\/p>\n

Event Management and Notification<\/p>\n

Data Warehouse Loading<\/p>\n

Data Protection<\/p>\n

Database Availability During Upgrade and Maintenance Operations<\/p>\n

14. What is changing data capture?<\/strong><\/p>\n

CDC is a technique to capture changes in database tables. These changes are stored in special tables. CDC operates in two modes: asynchronous, which is based on Java, and synchronous, which is used on database triggers. Performance overhead is higher in the case of synchronous CDC.<\/p>\n

15 <\/strong>. What is the capture process?<\/strong><\/p>\n

The capture process extracts database changes from redo log files at the source. It is a background process.<\/p>\n

16. How can you set a DML handler?<\/strong><\/p>\n

DML handler can be set by using the following statement:<\/p>\n

Dbms_apply_adm.set_dml_handler (object_name, object_type, operation_name, error_handler, user_procedure, apply_db_link)<\/p>\n

17. Why is additional supplemental logging needed?<\/strong><\/p>\n

The default logging process records the information about DML operations.<\/p>\n

Supplemental logging is required to identify the rows to be updated on each destination.<\/p>\n

18. How can you find the setup of lob_assembly?<\/strong><\/p>\n

You find the setup of lob_assembly by using the DBA_APPLY_DML_HANDLER view.<\/p>\n

19. What is Database Change Notification?<\/strong><\/p>\n

Database Change Notification is a service that is used to notify the registered clients whenever a change is committed.<\/p>\n

20. List some important Streams views.<\/strong><\/p>\n

Following are some important Streams views:<\/p>\n

DBA_STREAMS_TABLE_RULES<\/p>\n

DBA_APPLY_CONFLICT_COLUMNS<\/p>\n

GV$STREAMS_CAPTURE<\/p>\n<\/p>\n


Related Courses<\/strong><\/p>\n

\n\n\n\n\n\n\n\n\n
Course Name<\/th>\nEnroll Now<\/th>\n<\/tr>\n
Oracle Stream Training<\/td>\nEnroll Now<\/a><\/td>\n<\/tr>\n
Oracle Process Cloud Service Training<\/td>\nEnroll Now<\/a><\/td>\n<\/tr>\n
ORACLE DBA 11g\/12c TRAINING<\/td>\nEnroll Now<\/a><\/td>\n<\/tr>\n
ORACLE APPS TECHNICAL TRAINING<\/td>\nEnroll Now<\/a><\/td>\n<\/tr>\n
ORACLE SQL TRAINING<\/td>\nEnroll Now<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"

1. What is Oracle Streams? The Oracle streams products from Oracle Corporation and encourages users of Oracle databases to propagate …<\/p>\n","protected":false},"author":1,"featured_media":7117,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"pmpro_default_level":"","footnotes":""},"categories":[12],"tags":[308,391,700],"coauthors":[182],"class_list":["post-7114","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oracle_intervew_questions","tag-oracle","tag-oracle-pbcs-training","tag-oracle-stream","pmpro-has-access","user-has-not-earned"],"yoast_head":"\nOracle Stream Interview Questions and Answers - 2021<\/title>\n<meta name=\"description\" content=\"The stream can transfer information within a database or from one database to another. 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