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https://issues.apache.org/jira/browse/MAILBOX-186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418671#comment-16418671
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Tellier Benoit commented on MAILBOX-186:
----------------------------------------
The index was finally removed in
https://github.com/linagora/james-project/pull/1351
JPA did not created the index.
Moreover adding index is an opinionated OPS operation. Thus letting the admin
do it is a safe choice.
> 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
> Priority: Major
>
> We have an application which queries the IMAP store of Apache James 3 in the
> following manner:
> 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);
> 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:
> 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
> 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:
> 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);
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