undo_truncate::Space_id_bank Class Reference

A bank of UNDO space ids which is a lock free repository for information about the space IDs used for undo tablespaces. More...

Classes
struct	Space_id_account
	The currently used undo space IDs for an undo space along with a boolean showing whether the undo space number is in use. More...

Public Member Functions
	Space_id_bank ()
	~Space_id_bank ()
void	use_space_id (space_id_t space_id)
	Note that the undo space number for a space ID is being used. More...
void	unuse_space_id (space_id_t space_id)
	Mark an undo number associated with a given space_id as unused and available to be reused. More...
space_id_t	use_next_space_id (space_id_t space_num)
	Mark that the given undo space number is being used and return the next available space_id for that space number. More...
space_id_t	next_space_id (space_id_t space_id, space_id_t space_num)
	Given a valid undo space_id or SPACE_UNKNOWN, return the next space_id for the given space number. More...
space_id_t	next_space_id (space_id_t space_id)
	Given a valid undo space_id, return the next space_id for that space number. More...
space_id_t	get_next_available_space_id ()
	Return the next available undo space ID to be used for a new explicit undo tablespaces. More...
bool	check_space_id_in_use (space_id_t space_num)
	Check if the space_id mapped to space_num is in use. More...
space_id_t	get_current_space_id_for_num (space_id_t space_num)
	Return the current space id mapped to the space_num. More...

Private Attributes
Space_id_account	m_accounts [FSP_MAX_UNDO_TABLESPACES]

Detailed Description

A bank of UNDO space ids which is a lock free repository for information about the space IDs used for undo tablespaces.

It is used during creation in order to assign an unused space number and during truncation in order to assign the next space_id within that space_number range.

It is initialized with the minimum value in the range so that if a new space ID is needed in that range the max space ID will be used first. As truncation occurs, the space_ids are assigned from max down to min.

Constructor & Destructor Documentation

Space_id_bank()

undo_truncate::Space_id_bank::Space_id_bank ( )

inline

~Space_id_bank()

undo_truncate::Space_id_bank::~Space_id_bank ( )

inline

Member Function Documentation

check_space_id_in_use()

bool undo_truncate::Space_id_bank::check_space_id_in_use ( space_id_t  space_num )

inline

Check if the space_id mapped to space_num is in use.

Parameters

[in]

space_num

undo tablespace number

Returns

true if in use

get_current_space_id_for_num()

space_id_t undo_truncate::Space_id_bank::get_current_space_id_for_num ( space_id_t  space_num )

inline

Return the current space id mapped to the space_num.

Parameters

[in]

space_num

undo tablespace number

Returns

the tablespace ID mapped to space_num

get_next_available_space_id()

space_id_t undo_truncate::Space_id_bank::get_next_available_space_id

(

)

Return the next available undo space ID to be used for a new explicit undo tablespaces.

The slot will be marked as in-use.

Returns

next available undo space number if successful.

SPACE_UNKNOWN if failed

next_space_id() [1/2]

space_id_t undo_truncate::Space_id_bank::next_space_id

(

space_id_t

space_id

)

Given a valid undo space_id, return the next space_id for that space number.

Parameters

[in]

space_id

undo tablespace ID

Returns

the next tablespace ID to use

next_space_id() [2/2]

space_id_t undo_truncate::Space_id_bank::next_space_id	(	space_id_t	space_id,
		space_id_t	space_num
	)

Given a valid undo space_id or SPACE_UNKNOWN, return the next space_id for the given space number.

Parameters

[in]	space_id	undo tablespace ID
[in]	space_num	undo tablespace number

Returns

the next tablespace ID to use

unuse_space_id()

void undo_truncate::Space_id_bank::unuse_space_id

(

space_id_t

space_id

)

Mark an undo number associated with a given space_id as unused and available to be reused.

This happens when the fil_space_t is closed associated with a drop undo tablespace.

Parameters

[in]

space_id

Undo Tablespace ID

use_next_space_id()

space_id_t undo_truncate::Space_id_bank::use_next_space_id

(

space_id_t

space_num

)

Mark that the given undo space number is being used and return the next available space_id for that space number.

Parameters

[in]

space_num

undo tablespace number

Returns

the next tablespace ID to use

use_space_id()

void undo_truncate::Space_id_bank::use_space_id

(

space_id_t

space_id

)

Note that the undo space number for a space ID is being used.

Put that space_id into the space_id_bank.

Parameters

[in]

space_id

undo tablespace number

Member Data Documentation

m_accounts

Space_id_account undo_truncate::Space_id_bank::m_accounts[FSP_MAX_UNDO_TABLESPACES]

private

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

• storage/innobase/trx/trx0undo_trunc.cc