indexOptimizer

Optimizing the index reduces fragmentation and may significantly increase the speed of searches. In general, the fragmentation percentage should be less than 50%. A higher percentage indicates that search performance is compromised. If it is over 75%, then you should optimize the index as soon as possible.

Optimization of a very large index may take several hours. Schedule optimization during hours of low usage to ensures minimal disruption to users.

Object Type

Universal

State Properties

Property	Value
`endTime`	The date and time that the last optimization ended, in the form Day, DD Mon YYYY, HH:MM:SS GMT
`startTime`	The date and time that the last optimization started, in the same form as `endTime`
`status`	`DISABLED`, `EXECUTING`, `FAILED`, `LAUNCHING`, `SCHEDULED`, or `STOPPED`

Supported Operations

activate
deactivate
export
getState
start
update

Administration GUI Page

Global Settings - Index Optimization

XML Description

The <search:indexOptimizer> element describes index optimization:

<search:indexOptimizer>
   <search:frequency>

<!-- For hourly optimization -->
      <search:hourly>
        <search:hoursBtwnLaunches>

<!-- For daily optimization -->
      <search:daily>
        <search:daysBtwnLaunches>
        <search:startHour>

<!-- For weekly optimization -->
      <search:weekly>
        <search:weeksBtwnLaunches>
        <search:startDayOfWeek>
        <search:startHour>

<!-- For monthly optimization -->
      <search:monthly>
        <search:monthsBtwnLaunches>
        <search:startDayOfMonth>
        <search:startHour>

<!-- For all frequencies -->
   <search:duration>
      <search:maxHours>

Element Descriptions

<search:indexOptimizer>

Describes index optimization schedule. It contains these elements:

<search:frequency>
<search:duration>

<search:frequency>

Describes the optimization schedule. It contains one of these elements:

<search:hourly>
<search:daily>
<search:weekly>
<search:monthly>

<search:hourly>

Describes an hourly schedule. It contains a <search:hoursBtwnLaunches> element.

<search:hoursBtwnLaunches>

The number of hours between optimizations.

<search:daily>

Describes a daily schedule. It contains these elements:

<search:daysBtwnLaunches>
<search:startHour>

<search:daysBtwnLaunches>

The number of days between optimizations.

<search:startHour>

The time the crawl begins using a 24-hour clock, such as 9 for 9:00 a.m. or 23 for 11:00 p.m.

<search:weekly>

Describes a weekly schedule. It contains these elements:

<search:weeksBtwnLaunches>
<search:startDayOfWeek>
<search:startHour>

<search:weeksBtwnLaunches>

The number of weeks between optimizations.

<search:startDayOfWeek>

The day of the week that the crawl begins, such as MONDAY or TUESDAY.

<search:monthly>

Describes a monthly schedule. It contains these elements:

<search:monthsBtwnLaunches>
<search:startDayOfMonth>
<search:startHour>

<search:monthsBtwnLaunches>

The number of time periods between starting a crawl.

<search:startDayOfMonth>

An integer value for the day of the month that the crawl begins, such as 1 or 15.

<search:duration>

Controls the duration of the optimization process. It contains a <search:maxhours> element.

Attribute	Value
`haslimit`	Set to `true` to enforce the time limit, or set to `false` to allow the process to finish. Required.

<search:maxHours>

The number of hours the optimization process is allowed to continue. For best results, allow the optimization to finish.

Example

This XML document contains the index optimizer settings:

<?xml version="1.0" encoding="UTF-8"?>
<search:config productVersion="11.1.2.0.0" xmlns:search="http://xmlns.oracle.com/search">
   <search:indexOptimizer>
      <search:frequency>
         <search:weekly>
            <search:weeksBtwnLaunches>3</search:weeksBtwnLaunches>
            <search:startDayOfWeek>MONDAY</search:startDayOfWeek>
            <search:startHour>23</search:startHour>
         </search:weekly>
      </search:frequency>
      <search:duration haslimit="true">
         <search:maxHours>8</search:maxHours>
      </search:duration>
   </search:indexOptimizer>
</search:config>