Cache automatisch lÃ¶schen in Typo3Kategorie: Typo3, Tutorial
Von: Andreas Prucha
Von Ã„nderungen im Backend ist bis zur Aktualisierung des Caches auf der Site nichts zu sehen. LÃ¶schen des Caches hilft, aber das darf nicht jeder. Automatisierung bringt eine Abhilfe.
Cache LÃ¶schen fÃ¼r Benutzer freigeben.
Mit zwei Zeilen im TSConfig des Benutzers lassen sich sich die Funktionen Seiten-Cache lÃ¶schen und FE-Cache lÃ¶schen auch fÃ¼r normale Benutzer freigeben:
options.clearCache.pages = 1
options.clearCache.all = 1
Die Funktionen erscheinen aber nicht links im HauptmenÃ¼ des Typo3-Backends, sondern rechts oben im MenÃ¼ der jeweiligen Seite.
Diese Einstellung bietet normalen Benutzern die MÃ¶glichkeit den Cache zu lÃ¶schen, wirklich benutzerfreundlich ist das aber noch nicht, da die LÃ¶schung des Caches noch immer manuell vorgnommen werden muss.
Cache seitenabhÃ¤ngig automatisch lÃ¶schen
Eine elegantere MÃ¶glichkeit Caches zu lÃ¶schen bieten einige Optionen im Page-TSConfig. Diese Einstellungen ermÃ¶glichen es bei Ã„nderungen in einer Seite oder eines Folders automatisch den Cache anderer Seiten zu lÃ¶schen. Die Option bietet die MÃ¶glichkeit zur Angabe von einzelnen PIDs (PIDs sind die ID-Nummern der Seiten. Die PIDs erscheinen wenn man im Page-Tree mit der Maus Ã¼ber die Seiten-Symbole fÃ¤hrt), all fÃ¼r alle Caches und pages fÃ¼r Seiten-Caches.
Auch bei dieser Konfiguration muss
options.clearCache.all = 1, wie im vorherigen Kapitel beschrieben gesetzt werden, da sonst auch die automatische Cache-LÃ¶schung inaktiv ist. (Siehe http://bugs.typo3.org/view.php?id=4543)
Wird im TSConfig der root-Seite
# Caches aller Seiten bei Ã„nderungen automatisch verwerfen
TCEMAIN.clearCacheCmd = all
in das Page-TSConfig eingetragen bewirkt das, dass immer alle Caches gelÃ¶scht werden, sobald auf einer Seite eine Ã„nderung vorgenommen wird. Der Griff zu FE-Cache lÃ¶schen wird damit unnÃ¶tig.
Diese Einstellung hat aber nach wie vor den Nachteil, dass alle Caches gelÃ¶scht werden, und dadurch bei grossen Sites die Performance sinken kann.
Typo3 bietet auch die MÃ¶glichkeit zu lÃ¶schende Caches genauer zu spezifizieren. Bei der Verwendung beispielsweise von tt_news kann es z.B. sinnvoll sein beim Erstellen einer neuen News nur die Caches jener Seiten zu lÃ¶schen, die auf die News referenzieren, also z.B. die News-Ãœbersicht.
FÃ¼r diesen Zweck bietet Typo3 mit der Option TCEMAIN.clearCacheCmd die MÃ¶glichkeit zur AnfÃ¼hrung einer PID-Liste.
Die tt_news-Records befinden sich im Sysfolder "News", eine News-Ãœbersicht auf der Home-Seite mit der PID 1 und auf einer Unterseite mit der PID 23. Mit folgendem Eintrag in der Page-TSConfig des Sysfolders "News" wird der Cache der abhÃ¤ngigen Seiten bei Ã„nderung oder Erstellung eines News-Records automatisch gelÃ¶scht:
Page-TSConfig der Seite mit den News-Records:
# Caches von Seite 1 und 23 bei Eingabe von News automatisch lÃ¶schen
TCEMAIN.clearCacheCmd = 1,23
Typo3 bietet im Page-TSConfog noch weitere fÃ¼r das LÃ¶schen des Caches.
TCEMAIN.clearCache_pageSiblingChildren = 1 bietet die MÃ¶glichkeit die Unterseiten aller "Geschwisterseiten" (also die Caches aller Seiten auf gleicher Ebene sowie deren Unterseiten) automatisch lÃ¶schen zu lassen. StandardmÃ¤ssig, also wenn
TCEMAIN.clearCache_pageSiblingChildren = 0 ist, werden nur die Caches der Geschwisterseiten automatisch gelÃ¶scht.
TCEMAIN.clearCache_pageGrandParent = 1 lÃ¶scht den Cache der "Grosseltern-Seite", also der Ã¼ber der Ã¼bergeordneten Seite bei Ã„nderungen der Seite automatisch.
TCEMAIN.clearCache_disable = 1 im Page-TSConfig eingetragen ist werden bei Ã„nderungen in dieser Seite oder deren Unterseiten keine Caches automatisch gelÃ¶scht. Wird diese Option verwendet muss der Redakteur also immer manuell den Cache lÃ¶schen
Das manuelle Cache lÃ¶schen wird schnell zur Gewohnheit, ist allerdings nicht sehr benutzerfreundlich, insbesondere da die Funktion bei normalen Usern recht gut versteckt ist.
TCEMAIN.clearCacheCmd = all in der Page-TSConfig der obersten Seite ist die einfachste Alternative, insbesondere wenn die Typo3-Site nicht allzu gross ist und nicht allzuviele Ã„nderungen vorgenommen werden. Bei grossen Sites und Sites mit sehr vielen Besuchern kann das dauernde LÃ¶schen aller Caches - selbst wenn nur bei der kleinsten Ã„nderung vorgenommen wurde - auch Performance-Probleme hervorrufen. Da empfiehlt es sich dann mit TCEMAIN.clearCacheCmd unter Angabe von abhÃ¤ngigen Seiten-IDs die Einstellung etwas feiner vorzunehmen um nur jene Caches automatisch zu lÃ¶schen, die wirklich nicht mehr gÃ¼ltig sein sollen.
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