Struct UndoLogHeader 

pub struct UndoLogHeader {
    pub trx_id: u64,
    pub trx_no: u64,
    pub del_marks: bool,
    pub log_start: u16,
    pub xid_exists: bool,
    pub dict_trans: bool,
    pub table_id: u64,
    pub next_log: u16,
    pub prev_log: u16,
}

Parsed undo log record header (at the start of an undo log within the page).

Fields

trx_id: u64

Transaction ID that created this undo log.

trx_no: u64

Transaction serial number.

del_marks: bool

Whether delete marks exist in this undo log.

log_start: u16

Offset of the first undo log record.

xid_exists: bool

Whether XID info exists (distributed transactions).

dict_trans: bool

Whether this is a DDL transaction.

table_id: u64

Table ID (for insert undo logs).

next_log: u16

Offset of the next undo log header (0 if last).

prev_log: u16

Offset of the previous undo log header (0 if first).

Implementations

impl UndoLogHeader

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

Parse an undo log header from a page at the given offset.

The log_offset is typically obtained from UndoSegmentHeader::last_log or UndoPageHeader::start.

Trait Implementations

impl Clone for UndoLogHeader

fn clone(&self) -> UndoLogHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UndoLogHeader

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

Formats the value using the given formatter.

impl Serialize for UndoLogHeader

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

where __S: Serializer,

Serialize this value into the given Serde serializer.