About
db block get is a buffer retrieval mode.
It's also know as current mode get.
In this mode, the block is retrieved in the buffer cache.
The block is then known as a CURRENT block.
You will see these most frequently during modification statement, which must update only the latest copy of the block.
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Example
For example, if an uncommitted transaction has updated two rows in a block, then a current mode get retrieves the block with these uncommitted rows.
Statistics
In a statistics form, the statistic “db_block_gets” gives the Number of times a CURRENT block was requested
Reference
- Oracle® Database Reference 11g Release 2 (11.2) - Statistics Description VSESSTAT and VSYSSTAT