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NEW QUESTION: 1
DriverManagerクラスについて正しい記述はどれですか？
A. データベースに対してSQLステートメントを実行します。
B. さまざまなベンダーが特定のデータベース用に作成しています。
C. データベースのメタデータのみを照会します。
D. Connectionのインスタンスを返します。
Answer: D
Explanation:
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the underlying driver connection (which is often a PDO instance).
http://doctrine-dbal.readthedocs.org/en/latest/reference/configuration.html
NEW QUESTION: 2
Which option lists valid configuration commands to help identify packet flows for ingress and egress IP packets and provide statistics based on packet flows when configuring a
Cisco Nexus Device via the CLI?
A. IPFix Record IPFix Exporter IPFix Monitor
B. sFlow Record. sFlow Exporter sFlow
C. Flow Record. Flow Exporter. Flow Monitor
D. NetFlow Record NetFlow Exporter NetFlow
Answer: C
NEW QUESTION: 3
Hintergrund
Sie haben eine Datenbank mit dem Namen HR1, die eine Tabelle mit dem Namen Employee enthält.
Sie haben mehrere schreibgeschützte historische Berichte, die regelmäßig wechselnde Summen enthalten. In den Berichten werden mehrere Abfragen verwendet, um den Personalaufwand zu schätzen. Die Abfragen werden gleichzeitig ausgeführt. Benutzer berichten, dass die Gehaltsschätzungsberichte nicht immer ausgeführt werden. Sie müssen die Datenbank überwachen, um Probleme zu identifizieren, die die Ausführung der Berichte verhindern.
Sie planen, die Anwendung auf einem Datenbankserver bereitzustellen, der andere Anwendungen unterstützt. Sie müssen den für die Datenbank erforderlichen Speicherplatz minimieren.
Mitarbeitertabelle
Mit den folgenden Transact-SQL-Anweisungen können Sie die Employee-Tabelle erstellen, konfigurieren und auffüllen:
Anwendung
Sie haben eine Anwendung, die die Employees-Tabelle aktualisiert. Die Anwendung ruft die folgenden gespeicherten Prozeduren gleichzeitig und asynchron auf:
* UspA: Diese gespeicherte Prozedur aktualisiert nur die EmployeeStatus-Spalte.
* UspB: Diese gespeicherte Prozedur aktualisiert nur die EmployeePayRate-Spalte.
Die Anwendung verwendet Ansichten, um den Zugriff auf Daten zu steuern. Views müssen folgende Anforderungen erfüllen:
* Ermöglichen Sie dem Benutzer den Zugriff auf alle Spalten in den Tabellen, auf die die Ansicht zugreift.
* Aktualisierungen nur auf die Zeilen beschränken, die von der Ansicht zurückgegeben werden.
Ausstellungsstück
Sie analysieren die Leistung der Datenbankumgebung. Sie stellen fest, dass beim Generieren der Berichte über einen längeren Zeitraum Sperren bestehen.
Sie müssen die Berichte schneller generieren. Die Datenbank darf keine zusätzlichen Ressourcen verwenden.
Was tun?
A. Ändern Sie die Berichtsabfragen, um mithilfe der UNION-Anweisung die Ergebnisse von zwei oder mehr Abfragen zu kombinieren.
B. Wenden Sie einen nicht gruppierten Index auf alle Tabellen an, die in den Berichtsabfragen verwendet werden.
C. Aktualisieren Sie die Transaktionsebene der Berichtsabfragesitzung auf READ UNCOMMITTED.
D. Aktualisieren Sie alle FROM-Klauseln der DML-Anweisungen, um den Tabellenhinweis IGNORE_CONSTRAINTS zu verwenden.
Answer: C
Explanation:
Erläuterung
Transaktionen, die auf der Ebene READ UNCOMMITTED ausgeführt werden, geben keine gemeinsamen Sperren aus, um zu verhindern, dass andere Transaktionen die von der aktuellen Transaktion gelesenen Daten ändern. Dies ist die am wenigsten einschränkende Isolationsstufe.
Referenzen: https://technet.microsoft.com/en-us/library/ms173763(v=sql.105).aspx
NEW QUESTION: 4
A. Option B
B. Option A
C. Option C
D. Option D
Answer: B
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