log0files_dict.cc File Reference

Redo log - in-memory dictionary of log files (their meta data). More...

#include <algorithm>
#include <iterator>
#include <numeric>
#include "log0files_dict.h"

Functions
Helpers
bool	log_file_compute_logical_capacity (os_offset_t file_size_in_bytes, lsn_t &lsn_capacity)
	Computes logical capacity for the given physical size of the redo log file. More...
bool	log_file_compute_end_lsn (lsn_t start_lsn, os_offset_t file_size_in_bytes, lsn_t &end_lsn)
	Computes end_lsn for the given: start_lsn and size of the redo log file. More...
size_t	log_files_number_of_existing_files (const Log_files_dict &files)
	Counts the total number of existing log files. More...
size_t	log_files_number_of_consumed_files (const Log_files_dict &files)
	Counts the total number of existing and marked as consumed log files. More...
os_offset_t	log_files_size_of_existing_files (const Log_files_dict &files)
	Computes the total size of the existing log files (sum of sizes). More...
lsn_t	log_files_capacity_of_existing_files (const Log_files_dict &files)
	Computes the total capacity of the existing log files (sum of capacities). More...
Log_files_dict::Const_iterator	log_files_find_largest (const Log_files_dict &files)
	Finds the largest existing log file (with the largest m_size_in_bytes). More...

Detailed Description

Redo log - in-memory dictionary of log files (their meta data).

Function Documentation

log_file_compute_end_lsn()

bool log_file_compute_end_lsn	(	lsn_t	start_lsn,
		os_offset_t	file_size_in_bytes,
		lsn_t &	end_lsn
	)

Computes end_lsn for the given: start_lsn and size of the redo log file.

Parameters

[in]	start_lsn	LSN of the first data byte within the file
[in]	file_size_in_bytes	total size of file, expressed in bytes
[out]	end_lsn	LSN after the last data byte within the file

Return values

true	succeeded to compute end_lsn
false	params were invalid

log_file_compute_logical_capacity()

bool log_file_compute_logical_capacity	(	os_offset_t	file_size_in_bytes,
		lsn_t &	lsn_capacity
	)

Computes logical capacity for the given physical size of the redo log file.

Parameters

[in]	file_size_in_bytes	total size of file, expressed in bytes
[out]	lsn_capacity	logical capacity of the file

Return values

true	succeeded to compute the logical capacity
false	params were invalid (file size was too small or too big)

log_files_capacity_of_existing_files()

lsn_t log_files_capacity_of_existing_files

(

const Log_files_dict &

files

)

Computes the total capacity of the existing log files (sum of capacities).

Note

Capacity of a file is smaller than size of the file by LOG_FILE_HDR_SIZE.

Parameters

[in]

files

in-memory dictionary of log files

Returns

computed total capacity of existing log files

log_files_find_largest()

Log_files_dict::Const_iterator log_files_find_largest

(

const Log_files_dict &

files

)

Finds the largest existing log file (with the largest m_size_in_bytes).

Parameters

[in]

files

in-memory dictionary of log files

Returns

the largest file or files.end() if there is no file at all

log_files_number_of_consumed_files()

size_t log_files_number_of_consumed_files

(

const Log_files_dict &

files

)

Counts the total number of existing and marked as consumed log files.

Parameters

[in]

files

in-memory dictionary of log files

Returns

number of existing and marked as consumed log files.

log_files_number_of_existing_files()

size_t log_files_number_of_existing_files

(

const Log_files_dict &

files

)

Counts the total number of existing log files.

Parameters

[in]

files

in-memory dictionary of log files

Returns

number of existing log files.

log_files_size_of_existing_files()

os_offset_t log_files_size_of_existing_files

(

const Log_files_dict &

files

)

Computes the total size of the existing log files (sum of sizes).

Note

Each file starts with LOG_FILE_HDR_SIZE bytes of headers.

Parameters

[in]

files

in-memory dictionary of log files

Returns

computed total size of existing log files