To understand the retrieval sequences in IMS DB, let's go through each option:

A. Top to Bottom - This option is correct because in IMS DB, the retrieval sequence starts from the top level segment and goes down to the child segments. This ensures that the data is retrieved in a hierarchical manner.

B. Front to Back - This option is incorrect because the retrieval sequence in IMS DB is not based on the front-to-back order of segments. It is based on the hierarchy of segments.

C. Right to Left - This option is incorrect because the retrieval sequence in IMS DB is not based on the right-to-left order of segments. It is based on the hierarchy of segments.

D. Left to Right - This option is correct because after traversing down the hierarchy from top to bottom, IMS DB retrieves the segments from left to right within each level. This ensures that the segments at the same level are retrieved in a consistent order.

Therefore, the correct answer is A, B, D. These options represent the retrieval sequences in IMS DB, where the data is retrieved from top to bottom, from front to back, and from left to right.

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• Wrong explanation

To answer this question, you need to understand the components of Oracle architecture and their functions.

Option A) ADDM - This option is incorrect because ADDM (Automatic Database Diagnostic Monitor) is a component of Oracle that analyzes data and provides recommendations for improving database performance. It does not store statistics gathered by the MMON process.

Option B) AWR (Automatic Workload Repository) - This option is correct. AWR is a component of Oracle architecture that collects, processes, and stores performance-related data. It includes performance statistics gathered by various processes, including the MMON (Manageability Monitor) process. The statistics stored in AWR are used for performance tuning and analysis.

Option C) Data dictionary views - This option is incorrect. Data dictionary views provide information about the structure and content of the database, but they do not store statistics gathered by the MMON process.

Option D) Dynamic performance views - This option is incorrect. Dynamic performance views provide real-time information about the current state of the database, but they do not store statistics gathered by the MMON process.

The correct answer is B) AWR. This option is correct because AWR is specifically designed to store the statistics gathered by the MMON process and other performance-related data for analysis and tuning purposes.

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• Wrong explanation