Struct RollbackSegmentHeader 

pub struct RollbackSegmentHeader {
    pub max_size: u32,
    pub history_size: u32,
    pub slots: Vec<u32>,
}

Parsed rollback segment header (the page pointed to by RSEG array slots).

Contains the maximum size, history list length, and an array of up to 1024 undo segment page number slots.

Fields

max_size: u32

Maximum number of undo pages this RSEG can use.

history_size: u32

Number of committed transactions in the history list.

slots: Vec<u32>

Undo segment page numbers (FIL_NULL = empty slot).

Implementations

impl RollbackSegmentHeader

pub fn parse(page_data: &[u8]) -> Option<Self>

Parse a rollback segment header from a full page buffer.

The RSEG header starts at FIL_PAGE_DATA on the page pointed to by an RSEG array slot.

pub fn active_slots(&self) -> Vec<u32>

Return only the active (non-FIL_NULL, non-zero) slot page numbers.

Trait Implementations

impl Clone for RollbackSegmentHeader

fn clone(&self) -> RollbackSegmentHeader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RollbackSegmentHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Serialize for RollbackSegmentHeader

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.