Mambu Keynote Quiz

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The database transaction log is also called Write-Ahead log because:

The user must write to the log the action they plan to execute before actually running the database queries/commands

The database engine appends to the log the newly executed changes after writing the actual data

The database engine appends to the log the newly executed changes before writing the actual data

The user must write to the log after executing database queries/commands in order to maintain the database consistent

The following actions are recorded in the database log:

INSERT

SELECT

SHOW

GRANT

Inserting or updating a database record and then immediately publishing a message to a message broker is a bad practice because:

The message broker might use the same database for holding internal state and this can lead to concurrency issues

Failure to publish the message will automatically rollback the transaction

We should do it the other way around: publish message first and only then insert/update to the database

We cannot guarantee transactional execution of both actions: one might succeed while the other one fails, meaning we might reach inconsistent states

The following information CANNOT be extracted by default from the transaction log:

The user who executed the command

Command execution timestamp

The actual executed command

Transaction ID

The following statement is TRUE:

We can read uncommitted data during transaction execution through the database transaction log

The transaction log can be processed asynchronously, regardless of when it was written

All database systems expose and offer a transaction log

There is a general protocol for exposing transaction logs, and all database engines adhere to it

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