tune cacheing

ejabberd returns this error:
I get this error when archive messages.

** Table: archive_prefs
** Processes Number: 4
** Max Size: 25000 items
** Shrink Size: 12500 items
** Life Time: 3600000000 microseconds
** Hits/Miss: 36312/37501
** Owner: <0.38.0>
** Cache Missed: true
** Instruction: you have to tune cacheing options if this message repeats too frequently
2016-04-25 10:15:09.907 [error] <0.648.0> shrinking table:
** Table: archive_prefs
** Processes Number: 4
** Max Size: 25000 items
** Shrink Size: 12500 items
** Life Time: 3600000000 microseconds
** Hits/Miss: 36316/37501
** Owner: <0.38.0>
** Cache Missed: true
** Instruction: you have to tune cacheing options if this message repeats too frequently
2016-04-25 10:15:10.754 [error] <0.645.0> shrinking table:
** Table: archive_prefs
** Processes Number: 4
** Max Size: 25000 items
** Shrink Size: 12500 items
** Life Time: 3600000000 microseconds
** Hits/Miss: 36560/37501
** Owner: <0.38.0>
** Cache Missed: true
** Instruction: you have to tune cacheing options if this message repeats too frequently
2016-04-25 10:15:19.892 [error] <0.646.0> shrinking table:
** Table: archive_prefs
** Processes Number: 4
** Max Size: 25000 items
** Shrink Size: 12500 items
** Life Time: 3600000000 microseconds
** Hits/Miss: 36005/37501
** Owner: <0.38.0>
** Cache Missed: true
** Instruction: you have to tune cacheing options if this message repeats too frequently

how to fix it?thanks

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