Page History
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If Ignite Persistence is used then after a restart Ignite will load the tree's root node (metadata page) and be able to iterate over the tree layers preloading each new missing page in memory from disk on demand. Also, the tree pages can be merged into one if less of 50% of space within page is used by payload data.
Missing picture to be added
B+Tree are used for SQL indexes: tree maps field value to reference to entry value.
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