trx_rseg_t Struct Reference

The rollback segment memory object. More...

#include <trx0types.h>

Public Types
using	Undo_list = UT_LIST_BASE_NODE_T_EXTERN(trx_undo_t, undo_list)

Public Member Functions
bool	validate_curr_size (bool take_mutex=true)
	Validate the curr_size member by re-calculating it. More...
void	latch ()
	Enter the rseg->mutex. More...
void	unlatch ()
	Exit the rseg->mutex. More...
void	decr_curr_size (page_no_t npages=1)
	Decrement the current size of the rollback segment by the given number of pages. More...
void	incr_curr_size ()
	Increment the current size of the rollback segment by the given number of pages. More...
page_no_t	get_curr_size () const
void	set_curr_size (page_no_t npages)
std::ostream &	print (std::ostream &out) const

Public Attributes
size_t	id {}
	rollback segment id == the index of its slot in the trx system file copy More...
RsegMutex	mutex
	mutex protecting the fields in this struct except id,space,page_no which are constant More...
space_id_t	space_id {}
	space ID where the rollback segment header is placed More...
page_no_t	page_no {}
	page number of the rollback segment header More...
page_size_t	page_size
	page size of the relevant tablespace More...
page_no_t	max_size {}
	maximum allowed size in pages More...
Undo_list	update_undo_list
	List of update undo logs. More...
Undo_list	update_undo_cached
	List of update undo log segments cached for fast reuse. More...
Undo_list	insert_undo_list
	List of insert undo logs. More...
Undo_list	insert_undo_cached
	List of insert undo log segments cached for fast reuse. More...
page_no_t	last_page_no {}
	Page number of the last not yet purged log header in the history list; FIL_NULL if all list purged. More...
size_t	last_offset {}
	Byte offset of the last not yet purged log header. More...
trx_id_t	last_trx_no
	Transaction number of the last not yet purged log. More...
bool	last_del_marks {}
	true if the last not yet purged log needs purging More...
std::atomic< size_t >	trx_ref_count {}
	Reference counter to track rseg allocated transactions. More...

Private Attributes
page_no_t	curr_size {}
	current size in pages More...

Detailed Description

The rollback segment memory object.

Member Typedef Documentation

Undo_list

using trx_rseg_t::Undo_list = UT_LIST_BASE_NODE_T_EXTERN(trx_undo_t, undo_list)

Member Function Documentation

decr_curr_size()

void trx_rseg_t::decr_curr_size ( page_no_t  npages = 1 )

inline

Decrement the current size of the rollback segment by the given number of pages.

Parameters

[in]

npages

number of pages to reduce in size.

get_curr_size()

page_no_t trx_rseg_t::get_curr_size ( ) const

inline

incr_curr_size()

void trx_rseg_t::incr_curr_size ( )

inline

Increment the current size of the rollback segment by the given number of pages.

latch()

void trx_rseg_t::latch ( )

inline

Enter the rseg->mutex.

print()

std::ostream & trx_rseg_t::print ( std::ostream &  out ) const

inline

set_curr_size()

void trx_rseg_t::set_curr_size ( page_no_t  npages )

inline

unlatch()

void trx_rseg_t::unlatch ( )

inline

Exit the rseg->mutex.

validate_curr_size()

bool trx_rseg_t::validate_curr_size

(

bool

take_mutex = true

)

Validate the curr_size member by re-calculating it.

Parameters

[in]

take_mutex

take the rseg->mutex. default is true.

Returns

true if valid, false otherwise.

Member Data Documentation

curr_size

page_no_t trx_rseg_t::curr_size {}

private

current size in pages

id

size_t trx_rseg_t::id {}

rollback segment id == the index of its slot in the trx system file copy

insert_undo_cached

Undo_list trx_rseg_t::insert_undo_cached

List of insert undo log segments cached for fast reuse.

insert_undo_list

Undo_list trx_rseg_t::insert_undo_list

List of insert undo logs.

last_del_marks

bool trx_rseg_t::last_del_marks {}

true if the last not yet purged log needs purging

last_offset

size_t trx_rseg_t::last_offset {}

Byte offset of the last not yet purged log header.

last_page_no

page_no_t trx_rseg_t::last_page_no {}

Page number of the last not yet purged log header in the history list; FIL_NULL if all list purged.

last_trx_no

trx_id_t trx_rseg_t::last_trx_no

Transaction number of the last not yet purged log.

max_size

page_no_t trx_rseg_t::max_size {}

maximum allowed size in pages

mutex

RsegMutex trx_rseg_t::mutex

mutex protecting the fields in this struct except id,space,page_no which are constant

page_no

page_no_t trx_rseg_t::page_no {}

page number of the rollback segment header

page_size

page_size_t trx_rseg_t::page_size

page size of the relevant tablespace

space_id

space_id_t trx_rseg_t::space_id {}

space ID where the rollback segment header is placed

trx_ref_count

std::atomic<size_t> trx_rseg_t::trx_ref_count {}

Reference counter to track rseg allocated transactions.

update_undo_cached

Undo_list trx_rseg_t::update_undo_cached

List of update undo log segments cached for fast reuse.

update_undo_list

Undo_list trx_rseg_t::update_undo_list

List of update undo logs.

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The documentation for this struct was generated from the following files:

• storage/innobase/include/trx0types.h
• storage/innobase/trx/trx0rseg.cc