Mambu

Masterclass Quiz

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CDC Listeners must be idempotent because:

The transaction log reader might fail and re-process some transaction log entries

The transaction log reader will publish any event exactly once

The transaction log reader will publish any event at most once

The Database engine might write to the transaction log the same transaction multiple times

Using the database-per-service pattern adds extra complexity because:

Data being split means that services need to maintain connections to multiple databases

Changes to a single database schema impacts all existing (micro)services

Each service must use a different database provider

Transactional behavior is harder to replicate across multiple databases

Change Data Capture is a pattern where:

Data is intercepted before it reaches the Database in order to take some actions

Data is read after it has been made durable by the Database engine in order to take some actions

The Database engine publishes a message to a broker during transaction execution

Data is read before being committed in order to take some actions

The Saga pattern enables us to:

Implement queries which aggregate data from multiple data sources

Define compensatory actions for each processing step, which are triggered in case of failure

Execute multiple transactions in a single database

Execute queries and commands from different data sources

The following statement is TRUE:

A single shared database between all applications enables us to build loosely coupled services

The Saga pattern can be applied when executing multiple operations inside a single transaction

The database engine stores in the transaction log write operations before actually persisting them to disk

The transaction log processor can read the committed data a single time

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