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Salesforce Sample Questions:

1. 開発者は、Lightning Web コンポーネントからの入力に基づいてアカウントを更新する Apex クラスを作成しました。
アカウントの更新は、まだ登録されていない場合にのみ行ってください。
ジャワ
account = [SELECT Id, Is_Registered__c FROM Account WHERE Id = :accountId]; if (!account.Is_Registered__c) { account.Is_Registered__c = true;
// ...他のアカウント フィールドを設定します...
アカウントを更新します。
}
複数のユーザーが同時に同じアカウントを更新した場合に、互いの更新が上書きされないようにするには、開発者は何をすべきでしょうか?

A) 更新の代わりに upsert を使用します。
B) SOQL クエリで FOR UPDATE を使用します。
C) 最近更新されていないことを確認するために、クエリに LastModifiedDate を含めます。
D) 更新の周囲に try/catch ブロックを追加します。

2. 選択的 SOQL クエリであり、200,000 件のアカウント レコードの大規模なデータ セットに使用できるクエリはどれですか。

A) SELECT Id FROM Account WHERE Id IN (List of Account Ids)
B) SELECT Id FROM Account WHERE Name != ''
C) SELECT Id FROM Account WHERE Name LIKE '%Partner'
D) SELECT Id FROM Account WHERE Name IN (List of Names) AND Customer_Number__c =
'ValueA'

3. CalloutUtil.makeRestCallout が「コミットされていない作業が保留中です。呼び出し前にコミットまたはロールバックしてください」というエラーで失敗します。この問題を解決するにはどうすればよいですか？
Java
public void updateAndMakeCallout(Map<Id, Request__c> regs, Map<Id, Request_Line__c> regLines) { Savepoint sp = Database.setSavepoint(); try { insert regs.values(); insert regLines.values(); HttpResponse response = CalloutUtil.makeRestCallout(regs.keySet(), regLines.keySet());
} catch (Exception e) {
Database.rollback(sp);
}
}

A) CalloutUtil.makeRestCallout を @future メソッドに変更します。
B) CalloutUtil.makeRestCallout を @InvocableMethod メソッドに変更します。
C) Database.setSavepoint と Database.rollback を削除します。
D) CalloutUtil.makeRestCallout メソッド呼び出しを catch ブロックの下に移動します。

4. どのコードスニペットが最もメモリ効率の高い方法でレコードを処理し、ガバナ制限を回避しますか？
「Apex ヒープ サイズが大きすぎます」?

A) Java
List<Opportunity> opportunities = Database.query('SELECT Id, Amount from Opportunity'); for(Opportunity opp: opportunities){
// perform operation here
}
B) Java
for(Opportunity opp: [SELECT Id, Amount from Opportunity]){
// perform operation here
}
C) Java
List<Opportunity> opportunities = [SELECT Id, Amount from Opportunity]; for(Opportunity opp: opportunities){
// perform operation here
}
D) Java
Map<Id, Opportunity> opportunities = new Map<Id, Opportunity>([SELECT Id, Amount from Opportunity]); for(Id oppId: opportunities.keySet()){
// perform operation here
}

5. 以下のオプションの
クエリと次の情報を考慮してください。
* これらのクエリでは、アカウント レコードが 200,000 件以上あると想定します。
* これらのレコードには、ごみ箱内のソフト削除されたレコードが含まれます。
* 外部 ID としてマークされているフィールドが 2 つあります: Customer_Number__c と ERP_Key__c。
大量のデータに最適化されているクエリはどれですか?

A) アカウントから ID を選択、名前が != '' かつ IsDeleted = false
B) アカウントから ID を選択、名前が NULL の場合
C) アカウントから ID を選択 (ID が :aListVariable にある場合)
D) アカウントから ID を選択、名前 != '' かつ Customer_Number__c = 'ValueA'

Solutions: