Struct SizeApproximationOptions 

pub struct SizeApproximationOptions { /* private fields */ }

Options for the _with_options variants of DB::get_approximate_sizes.

At least one of set_include_memtables, set_include_files and set_include_blob_files has to be on, or there is nothing left to measure.

Implementations

impl SizeApproximationOptions

pub fn new() -> SizeApproximationOptions

pub fn set_include_memtables(&mut self, include: bool)

Counts data still sitting in the memtables.

Default: false

pub fn get_include_memtables(&self) -> bool

Returns the value of the include_memtables option.

pub fn set_include_files(&mut self, include: bool)

Counts data written out to SST files.

Default: true

pub fn get_include_files(&self) -> bool

Returns the value of the include_files option.

pub fn set_include_blob_files(&mut self, include: bool)

Counts a share of the blob files, prorated by how much of the SST data falls in the range:

blob_size_in_range ~= total_blob_size * (sst_in_range / total_sst)

That assumes blob values are spread evenly across keys, so it skews when value sizes vary a lot. It also reports zero blob bytes when every key is still in a memtable, because there is no SST data to prorate against.

Default: false

pub fn get_include_blob_files(&self) -> bool

Returns the value of the include_blob_files option.

pub fn set_files_size_error_margin(&mut self, margin: f64)

Lets the file-size estimate be off by up to total_files_size * margin in exchange for doing less work, so 0.1 allows a 10% error.

Zero or negative asks for the precise and more CPU intensive walk.

pub fn get_files_size_error_margin(&self) -> f64

Returns the value of the files_size_error_margin option.

Trait Implementations

impl Default for SizeApproximationOptions

fn default() -> Self

Returns the “default value” for a type.

impl Drop for SizeApproximationOptions

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.