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From "Craig George (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAILBOX-186) Missing indices on JPA mailstore database results in poor mailbox listing as the number of messages grows
Date Wed, 21 Nov 2012 02:48:58 GMT
Craig George created MAILBOX-186:
------------------------------------

             Summary: Missing indices on JPA mailstore database results in poor mailbox listing
as the number of messages grows
                 Key: MAILBOX-186
                 URL: https://issues.apache.org/jira/browse/MAILBOX-186
             Project: James Mailbox
          Issue Type: Bug
          Components: jpa
    Affects Versions: 0.4
            Reporter: Craig George


We have an application which queries the IMAP store of Apache James 3 in the following manner:
{code}
final Message[] messages = this.folder.getMessages();
final FetchProfile fetchProfile = new FetchProfile();
fetchProfile.add(Item.ENVELOPE);
fetchProfile.add(Item.FLAGS);
fetchProfile.add(Item.CONTENT_INFO);
fetchProfile.add(IMAPFolder.FetchProfileItem.HEADERS);
fetchProfile.add(IMAPFolder.FetchProfileItem.SIZE);
fetchProfile.add(UIDFolder.FetchProfileItem.UID);
this.folder.fetch(messages, fetchProfile);
{code}
When this query is performed on a folder with a large number of messages the response times
degrade very quickly. This is due to the following query being run *for each* message:
{code:sql}
SELECT t0.PROPERTY_ID,
    t0.PROPERTY_LINE_NUMBER,
    t0.PROPERTY_LOCAL_NAME,
    t0.PROPERTY_NAME_SPACE,
    t0.PROPERTY_VALUE
FROM MA_DIRECT_APACHE_JAMES.JAMES_MAIL_PROPERTY t0
WHERE t0.MAILBOX_ID = :1
AND t0.MAIL_UID = :2
ORDER BY t0.PROPERTY_LINE_NUMBER ASC
{code}
The problem is that in the {{JAMES_MAIL_PROPERTY}} table only the {{PROPERTY_LINE_ID}} column
is indexed, implicity by virtue of the fact that it is the primary key. The workaround is
to add the following indexes on the table:
{code:sql}
CREATE INDEX I_JMS_MIL_PROPERTY_MSG_ID ON JAMES_MAIL_PROPERTY (MAILBOX_ID, MAIL_UID);
CREATE INDEX I_JMS_MIL_PROPERTY_LINE_NUMBER ON JAMES_MAIL_PROPERTY (PROPERTY_LINE_NUMBER);
{code}

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