duckdb::UndoBuffer Class Reference

Collaboration diagram for duckdb::UndoBuffer:

Classes
struct	IteratorState

Public Member Functions
	UndoBuffer (DuckTransaction &transaction, ClientContext &context)
UndoBufferReference	CreateEntry (UndoFlags type, idx_t len)
	Write a specified entry to the undo buffer.
bool	ChangesMade ()
UndoBufferProperties	GetProperties ()
void	Cleanup (transaction_t lowest_active_transaction)
	Cleanup the undo buffer.
void	WriteToWAL (WriteAheadLog &wal, optional_ptr< StorageCommitState > commit_state)
	Commit the changes made in the UndoBuffer: should be called on commit.
void	Commit (UndoBuffer::IteratorState &iterator_state, CommitInfo &info)
	Commit the changes made in the UndoBuffer: should be called on commit.
void	RevertCommit (UndoBuffer::IteratorState &iterator_state, transaction_t transaction_id)
	Revert committed changes made in the UndoBuffer up until the currently committed state.
void	Rollback ()

Private Member Functions
template<class T >
void	IterateEntries (UndoBuffer::IteratorState &state, T &&callback)
template<class T >
void	IterateEntries (UndoBuffer::IteratorState &state, UndoBuffer::IteratorState &end_state, T &&callback)
template<class T >
void	ReverseIterateEntries (T &&callback)

Private Attributes
DuckTransaction &	transaction
UndoBufferAllocator	allocator
ActiveTransactionState	active_transaction_state = ActiveTransactionState::UNSET

Detailed Description

The undo buffer of a transaction is used to hold previous versions of tuples that might be required in the future (because of rollbacks or previous transactions accessing them)

Member Function Documentation

Rollback()

void duckdb::UndoBuffer::Rollback

(

)

Rollback the changes made in this UndoBuffer: should be called on rollback

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The documentation for this class was generated from the following file:

• external/duckdb/duckdb.cpp