Class: Innodb::Log

Class

Innodb::Log

In:

lib/innodb/log.rb

Parent:

Object

An InnoDB transaction log file.

Methods

block block_cursor block_data checkpoint each_block header new read_checkpoint

Constants

LOG_HEADER_BLOCK_MAP	=	{ :LOG_FILE_HEADER => 0, :LOG_CHECKPOINT_1 => 1, :EMPTY => 2, :LOG_CHECKPOINT_2 => 3, }		A map of the name and position of the blocks that form the log header.
LOG_HEADER_BLOCKS	=	LOG_HEADER_BLOCK_MAP.size		Number of blocks in the log file header.
LOG_HEADER_SIZE	=	LOG_HEADER_BLOCKS * Innodb::LogBlock::BLOCK_SIZE		The size in bytes of the log file header.
LOG_CHECKPOINT_GROUPS	=	32		Maximum number of log group checkpoints.

Attributes

blocks	[R]	The number of blocks in the log.
capacity	[R]	The log capacity (in bytes).
size	[R]	The size (in bytes) of the log.

Public Class methods

Open a log file.

Public Instance methods

block(block_index)

Return a log block with a given block index as an InnoDB::LogBlock object. Blocks are indexed after the log file header, starting from 0.

block_cursor(offset)

Get a cursor to a block in a given offset of the log.

block_data(offset)

Get the raw byte buffer for a specific block by block offset.

Return the log checkpoints.

each_block() {|block_index, current_block if current_block| ...}

Iterate through all log blocks, returning the block index and an InnoDB::LogBlock object for each block.

Return the log header.

read_checkpoint(c)

Read a log checkpoint from the given cursor.