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Examples of specifying conditional image copies

The following examples use CHANGELIMIT, but FULL AUTO FULLPCT can be substituted for CHANGELIMIT in all cases.

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Specifying-conditional-image-copies


Information
Example
CHANGELIMIT 5,45
CHANGELIMIT (5,45)

The CHANGELIMIT specifications above both mean the same thing. Take a full image copy if the percent of changed pages is equal to or greater than 45 percent. Take an incremental image copy if the percent of changed pages is greater than 5 and less than 45 percent. Take no image copy if the percentage of changed pages is 5 percent or less.

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Example
CHANGELIMIT .9,25.8
CHANGELIMIT (.9,25.8)

The CHANGELIMIT specifications above both mean the same thing. Take a full image copy of a table space if the number of changed pages is equal to or greater than 25.8 percent. Take an incremental image copy if the percent of changed pages is greater than .9 and less than 25.8 percent. Take no image copy if the percent of changed pages is .9 percent or less.

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Example
CHANGELIMIT 50
CHANGELIMIT (50)

The CHANGELIMIT specifications above both mean the same thing. Take a full image copy of a table space if the number of changed pages is equal to or greater than 50 percent. Take an incremental image copy if the percentage of changed pages is less than 50 percent.

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Example
CHANGELIMIT .01
CHANGELIMIT (.01)

The CHANGELIMIT specifications above both mean the same thing. Take a full image copy of a table space if any pages have changed since the last image copy. Note that 0.01 percent is the smallest value that will be reported if any pages have changed.

You can also use the following CHANGELIMIT specification to create a full copy if any pages are changed:

CHANGELIMIT ANY

You cannot specify ANY with the FULL AUTO option.

Information
Example
CHANGELIMIT 10,0

The CHANGELIMIT specification means taking an incremental image copy if the percent of changed pages is greater than 10. Take no image copy if the percentage of changed pages is 10 percent or less. (0 as fullPct prevents full copy escalation based on changed pages--escalation might occur for other reasons)

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Example
CHANGELIMIT ,
CHANGELIMIT (,)

The CHANGELIMIT specification takes default values for incrPct and fullPct from the installation options INCRPCT and FULLPCT.

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Example
CHANGELIMIT 5,
CHANGELIMIT (5,)

The CHANGELIMIT specification takes the default value fullPct from the installation option FULLPCT.

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Example
CHANGELIMIT ,45
CHANGELIMIT ( ,45)

The CHANGELIMIT specification takes the default value incrPct from the configuration INCRPCT.

The ANY keyword can be specified with the CHANGELIMIT option to create incremental or full copies if any pages are changed instead of based on whether the percentage of changed pages falls within the specified range of values. You cannot specify ANY with the FULL AUTO option.

Information
Example
CHANGELIMIT ANY,15
CHANGELIMIT (ANY,15)

The CHANGELIMIT specification makes an incremental image copy if any pages are changed, but the percentage of changed pages does not exceed 15 percent. If more than 15 percent of pages are changed, it creates a full copy.


 

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BMC AMI Copy for Db2 13.1