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Apex
Programming Review Study Guide
1.
What
is
required
for
deploying
Apex
code
to
a
Production
instance?:
When
deploying Apex code to production, there are three things which are required:
All
classes
and
triggers
must
successfully
compile.
Tests must cover at least 75% of all Apex code and there must not be any failures.
All triggers must have at least 1% coverage.
2.
What's
the
difference
between
queueable
Apex,
batch
Apex
and
schedulable
Apex?:
Queueable Apex: This is an async process which can be launched to run processing, callouts, etc. This is
useful
when
trying
to
do
processes
in
triggers
which
are
long
running,
or
simply
unavailable,
e.g.
callouts.
Batch Apex: An Apex process which is designed to handle large numbers of records (up to 50 million) by processing
them in smaller batches of 1 - 2000 records at a time.
Scheduled Apex: A process that is scheduled to run at a specific time and date. This can be customized to be repeatable,
either
by scheduling it through the UI, or via a CRON string within other Apex code.
3.
What
are
the
different
events
for
an
Apex
Trigger?:
Triggers are split into two main types:
