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LRU dump backup

This feature reduces the warm up time by restoring buffer pool state from ib_lru_dump file after restart. Percona XtraBackup discovers ib_lru_dump and backs it up automatically.

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If the buffer restore option is enabled in my.cnf buffer pool will be in the warm state after backup is restored. To enable this set the variable innodb_buffer_pool_restore_at_startup =1 in Percona Server 5.5 or innodb_auto_lru_dump =1 in Percona Server 5.1.

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