從我閱讀文檔和評論,我看到：

mysql_pconnect上的文檔(不建議使用的方法)

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use ( mysql_close() will not close links established by mysql_pconnect()).

并對該頁面發(fā)表評論

Persistent connections work well for CGI PHP managed by fastCGI, contrary to the suggestion above that they only work for the module version. That’s because fastCGI keeps PHP processes running between requests. Persistent connections in this mode are easily made immune to connection limits too, because you can set PHP_FCGI_CHILDREN << mysql’s max_connections <<< Apache’s MaxClients. This also saves resources.

關(guān)于mysqli_connect的文檔(新方法)

Prepending host by p: opens a persistent connection. mysqli_change_user() is automatically called on connections opened from the connection pool.

mysqli_change_user的文檔：

Changes the user of the specified database connection and sets the current database.

所以我的理解如下：pconnect在腳本結(jié)束后保持連接打開但是進(jìn)程(或者可能是進(jìn)程組)仍處于活動狀態(tài)(例如在設(shè)置了FCGI的服務(wù)器中).一次只有一個(gè)腳本使用連接,當(dāng)新腳本獲取該連接時(shí),將更新用戶和數(shù)據(jù)庫.

因此,如果使用FCGI和持久連接,則可以減少打開的數(shù)據(jù)庫連接數(shù),但同時(shí)運(yùn)行的腳本將不會共享同一連接.關(guān)于選擇哪個(gè)數(shù)據(jù)庫,連接沒有問題.

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