trx0sys.h File Reference

#include "univ.i"
#include "trx0types.h"
#include "fsp0types.h"
#include "fil0fil.h"
#include "buf0buf.h"
#include "mtr0mtr.h"
#include "ut0byte.h"
#include "mem0mem.h"
#include "sync0sync.h"
#include "ut0lst.h"
#include "ut0bh.h"
#include "read0types.h"
#include "page0types.h"
#include "fsp0fsp.h"
#include "trx0sys.ic"

Include dependency graph for trx0sys.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes
struct	trx_sys_t

Macros
#define	TRX_SYS_SYSTEM_RSEG_ID   0
#define	TRX_SYS_SPACE   0 /* the SYSTEM tablespace */
#define	TRX_SYS_PAGE_NO   FSP_TRX_SYS_PAGE_NO
#define	TRX_SYS   FSEG_PAGE_DATA
#define	TRX_SYS_TRX_ID_STORE   0
#define	TRX_SYS_FSEG_HEADER   8
#define	TRX_SYS_RSEGS   (8 + FSEG_HEADER_SIZE)
#define	TRX_SYS_N_RSEGS   128
#define	TRX_SYS_OLD_N_RSEGS   256
#define	TRX_SYS_MYSQL_LOG_NAME_LEN   512
#define	TRX_SYS_MYSQL_LOG_MAGIC_N   873422344
#define	TRX_SYS_MYSQL_MASTER_LOG_INFO   (UNIV_PAGE_SIZE - 2000)
#define	TRX_SYS_MYSQL_LOG_INFO   (UNIV_PAGE_SIZE - 1000)
#define	TRX_SYS_MYSQL_LOG_MAGIC_N_FLD   0
#define	TRX_SYS_MYSQL_LOG_OFFSET_HIGH   4
#define	TRX_SYS_MYSQL_LOG_OFFSET_LOW   8
#define	TRX_SYS_MYSQL_LOG_NAME   12
#define	TRX_SYS_TRX_ID_WRITE_MARGIN   256
#define	TRX_SYS_DOUBLEWRITE   (UNIV_PAGE_SIZE - 200)
#define	TRX_SYS_DOUBLEWRITE_FSEG   0
#define	TRX_SYS_DOUBLEWRITE_MAGIC   FSEG_HEADER_SIZE
#define	TRX_SYS_DOUBLEWRITE_BLOCK1   (4 + FSEG_HEADER_SIZE)
#define	TRX_SYS_DOUBLEWRITE_BLOCK2   (8 + FSEG_HEADER_SIZE)
#define	TRX_SYS_DOUBLEWRITE_REPEAT   12
#define	TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED   (24 + FSEG_HEADER_SIZE)
#define	TRX_SYS_DOUBLEWRITE_MAGIC_N   536853855
#define	TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N   1783657386
#define	TRX_SYS_DOUBLEWRITE_BLOCK_SIZE   FSP_EXTENT_SIZE
#define	TRX_SYS_FILE_FORMAT_TAG   (UNIV_PAGE_SIZE - 16)
#define	TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW   3645922177UL
#define	TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH   2745987765UL
#define	TRX_SYS_FILE_FORMAT_TAG_MAGIC_N

Functions
typedef	UT_LIST_BASE_NODE_T (trx_t) trx_list_t
UNIV_INLINE ibool	trx_sys_hdr_page (ulint space, ulint page_no)
UNIV_INTERN ib_bh_t *	trx_sys_init_at_db_start (void)
UNIV_INTERN void	trx_sys_create (void)
UNIV_INTERN void	trx_sys_create_sys_pages (void)
UNIV_INTERN ulint	trx_sysf_rseg_find_free (mtr_t *mtr)
UNIV_INLINE trx_rseg_t *	trx_sys_get_nth_rseg (trx_sys_t *sys, ulint n)
UNIV_INLINE trx_sysf_t *	trx_sysf_get (mtr_t *mtr)
UNIV_INLINE ulint	trx_sysf_rseg_get_space (trx_sysf_t *sys_header, ulint i, mtr_t *mtr)
UNIV_INLINE ulint	trx_sysf_rseg_get_page_no (trx_sysf_t *sys_header, ulint i, mtr_t *mtr)
UNIV_INLINE void	trx_sysf_rseg_set_space (trx_sysf_t *sys_header, ulint i, ulint space, mtr_t *mtr)
UNIV_INLINE void	trx_sysf_rseg_set_page_no (trx_sysf_t *sys_header, ulint i, ulint page_no, mtr_t *mtr)
UNIV_INLINE trx_id_t	trx_sys_get_new_trx_id (void)
UNIV_INLINE trx_id_t	trx_sys_get_max_trx_id (void)
UNIV_INLINE void	trx_write_trx_id (byte *ptr, trx_id_t id)
UNIV_INLINE trx_id_t	trx_read_trx_id (const byte *ptr)
UNIV_INLINE trx_t *	trx_get_rw_trx_by_id (trx_id_t trx_id)
UNIV_INLINE trx_id_t	trx_rw_min_trx_id (void)
UNIV_INLINE trx_t *	trx_rw_is_active_low (trx_id_t trx_id, ibool *corrupt)
UNIV_INLINE trx_t *	trx_rw_is_active (trx_id_t trx_id, ibool *corrupt)
UNIV_INTERN void	trx_sys_update_mysql_binlog_offset (const char *file_name, ib_int64_t offset, ulint field, mtr_t *mtr)
UNIV_INTERN void	trx_sys_print_mysql_binlog_offset (void)
UNIV_INTERN void	trx_sys_print_mysql_master_log_pos (void)
UNIV_INTERN void	trx_sys_file_format_init (void)
UNIV_INTERN void	trx_sys_file_format_close (void)
UNIV_INTERN void	trx_sys_file_format_tag_init (void)
UNIV_INTERN void	trx_sys_close (void)
UNIV_INTERN const char *	trx_sys_file_format_id_to_name (const ulint id)
UNIV_INTERN ibool	trx_sys_file_format_max_set (ulint format_id, const char **name)
UNIV_INTERN ulint	trx_sys_create_rsegs (ulint n_spaces, ulint n_rsegs)
UNIV_INLINE ulint	trx_sys_get_n_rw_trx (void)
UNIV_INTERN ulint	trx_sys_any_active_transactions (void)
UNIV_INTERN const char *	trx_sys_file_format_max_get (void)
UNIV_INTERN dberr_t	trx_sys_file_format_max_check (ulint max_format_id)
UNIV_INTERN ibool	trx_sys_file_format_max_upgrade (const char **name, ulint format_id)

Variables
trx_sys_t *	trx_sys
char	trx_sys_mysql_master_log_name []
ib_int64_t	trx_sys_mysql_master_log_pos
char	trx_sys_mysql_bin_log_name []
ib_int64_t	trx_sys_mysql_bin_log_pos

Detailed Description

Transaction system

Created 3/26/1996 Heikki Tuuri

Definition in file trx0sys.h.

Macro Definition Documentation

#define TRX_SYS_DOUBLEWRITE   (UNIV_PAGE_SIZE - 200)

Doublewrite buffer The offset of the doublewrite buffer header on the trx system header page

Definition at line 535 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_BLOCK1   (4 + FSEG_HEADER_SIZE)

page number of the first page in the first sequence of 64 (= FSP_EXTENT_SIZE) consecutive pages in the doublewrite buffer

Definition at line 545 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_BLOCK2   (8 + FSEG_HEADER_SIZE)

page number of the first page in the second sequence of 64 consecutive pages in the doublewrite buffer

Definition at line 552 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_BLOCK_SIZE   FSP_EXTENT_SIZE

Size of the doublewrite block in pages

Definition at line 580 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_FSEG   0

fseg header of the fseg containing the doublewrite buffer

Definition at line 537 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_MAGIC   FSEG_HEADER_SIZE

4-byte magic number which shows if we already have created the doublewrite buffer

Definition at line 540 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_MAGIC_N   536853855

Contents of TRX_SYS_DOUBLEWRITE_MAGIC

Definition at line 575 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_REPEAT   12

we repeat TRX_SYS_DOUBLEWRITE_MAGIC, TRX_SYS_DOUBLEWRITE_BLOCK1, TRX_SYS_DOUBLEWRITE_BLOCK2 so that if the trx sys header is half-written to disk, we still may be able to recover the information

Definition at line 558 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED   (24 + FSEG_HEADER_SIZE)

If this is not yet set to TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N,

we must reset the doublewrite buffer, because starting from 4.1.x the space id of a data page is stored into FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID.

Definition at line 571 of file trx0sys.h.

#define TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED_N   1783657386

Contents of TRX_SYS_DOUBLEWRITE_SPACE_ID_STORED

Definition at line 577 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG   (UNIV_PAGE_SIZE - 16)

File format tag The offset of the file format tag on the trx system header page (TRX_SYS_PAGE_NO of TRX_SYS_SPACE)

Definition at line 587 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N

Value:

((ib_uint64_t) TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH << 32       \
         | TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW)

Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format

identifier is added to this 64-bit constant.

Definition at line 596 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_HIGH   2745987765UL

Contents of TRX_SYS_FILE_FORMAT_TAG+4 when valid

Definition at line 593 of file trx0sys.h.

#define TRX_SYS_FILE_FORMAT_TAG_MAGIC_N_LOW   3645922177UL

Contents of TRX_SYS_FILE_FORMAT_TAG when valid. The file format

identifier is added to this constant.

Definition at line 591 of file trx0sys.h.

#define TRX_SYS_FSEG_HEADER   8

segment header for the tablespace segment the trx system is created into

Definition at line 486 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_INFO   (UNIV_PAGE_SIZE - 1000)

The offset of the MySQL binlog offset info in the trx system header

Definition at line 521 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_MAGIC_N   873422344

Contents of TRX_SYS_MYSQL_LOG_MAGIC_N_FLD

Definition at line 511 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_MAGIC_N_FLD   0

magic number which is TRX_SYS_MYSQL_LOG_MAGIC_N if we have valid data in the MySQL binlog info

Definition at line 522 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_NAME   12

MySQL log file name

Definition at line 530 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_NAME_LEN   512

Maximum length of MySQL binlog file name, in bytes.

See Also

trx_sys_mysql_master_log_name

trx_sys_mysql_bin_log_name

Definition at line 509 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_OFFSET_HIGH   4

high 4 bytes of the offset within that file

Definition at line 526 of file trx0sys.h.

#define TRX_SYS_MYSQL_LOG_OFFSET_LOW   8

low 4 bytes of the offset within that file

Definition at line 528 of file trx0sys.h.

#define TRX_SYS_MYSQL_MASTER_LOG_INFO   (UNIV_PAGE_SIZE - 2000)

The offset of the MySQL replication info in the trx system header;

this contains the same fields as TRX_SYS_MYSQL_LOG_INFO below

Definition at line 518 of file trx0sys.h.

#define TRX_SYS_RSEGS   (8 + FSEG_HEADER_SIZE)

the start of the array of rollback segment specification slots

Definition at line 489 of file trx0sys.h.

#define TRX_SYS_TRX_ID_STORE   0

Transaction system header the maximum trx id or trx number modulo TRX_SYS_TRX_ID_UPDATE_MARGIN written to a file page by any transaction; the assignment of transaction ids continues from this number rounded up by TRX_SYS_TRX_ID_UPDATE_MARGIN plus TRX_SYS_TRX_ID_UPDATE_MARGIN when the database is started

Definition at line 474 of file trx0sys.h.

#define TRX_SYS_TRX_ID_WRITE_MARGIN   256

When a trx id which is zero modulo this number (which must be a power of

two) is assigned, the field TRX_SYS_TRX_ID_STORE on the transaction system page is updated

Definition at line 667 of file trx0sys.h.

Function Documentation

UNIV_INLINE trx_t* trx_get_rw_trx_by_id

(

trx_id_t

trx_id

)

Looks for the trx instance with the given id in the rw trx_list. The caller must be holding trx_sys->mutex.

Returns

the trx handle or NULL if not found; the pointer must not be dereferenced unless lock_sys->mutex was acquired before calling this function and is still being held in: trx id to search for

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UNIV_INLINE trx_id_t trx_read_trx_id

(

const byte *

ptr

)

Reads a trx id from an index page. In case that the id size changes in some future version, this function should be used instead of mach_read_...

Returns

id in: pointer to memory from where to read

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UNIV_INLINE trx_t* trx_rw_is_active	(	trx_id_t	trx_id,
		ibool *	corrupt
	)

Checks if a rw transaction with the given id is active. If the caller is not holding lock_sys->mutex, the transaction may already have been committed.

Returns

transaction instance if active, or NULL; the pointer must not be dereferenced unless lock_sys->mutex was acquired before calling this function and is still being held in: NULL or pointer to a flag that will be set if corrupt

Parameters

trx_id

in: trx id of the transaction

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UNIV_INLINE trx_t* trx_rw_is_active_low	(	trx_id_t	trx_id,
		ibool *	corrupt
	)

Checks if a rw transaction with the given id is active. Caller must hold trx_sys->mutex in shared mode. If the caller is not holding lock_sys->mutex, the transaction may already have been committed.

Returns

transaction instance if active, or NULL; the pointer must not be dereferenced unless lock_sys->mutex was acquired before calling this function and is still being held in: NULL or pointer to a flag that will be set if corrupt

Parameters

trx_id

in: trx id of the transaction

UNIV_INLINE trx_id_t trx_rw_min_trx_id

(

void

)

Returns the minimum trx id in rw trx list. This is the smallest id for which the trx can possibly be active. (But, you must look at the trx->state to find out if the minimum trx id transaction itself is active, or already committed.)

Returns

the minimum trx id, or trx_sys->max_trx_id if the trx list is empty

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UNIV_INTERN void trx_sys_close

(

void

)

Shutdown/Close the transaction system.

Definition at line 1157 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_create

(

void

)

Creates the trx_sys instance and initializes ib_bh and mutex.

Definition at line 587 of file trx0sys.cc.

UNIV_INTERN ulint trx_sys_create_rsegs	(	ulint	n_spaces,
		ulint	n_rsegs
	)

number of rollback segments to create

Parameters

n_spaces	number of tablespaces for UNDO logs
n_rsegs	number of rollback segments to create

Definition at line 874 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_create_sys_pages

(

void

)

Creates and initializes the transaction system at the database creation.

Definition at line 601 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_file_format_close

(

void

)

Closes the tablespace tag system.

Definition at line 863 of file trx0sys.cc.

UNIV_INTERN const char * trx_sys_file_format_id_to_name

(

const ulint

id

)

Get the name representation of the file format from its id.

Returns

pointer to the name in: id of the file format

Get the name representation of the file format from its id.

Returns

pointer to the name

Parameters

id	in: id of the file format

Definition at line 692 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_file_format_init

(

void

)

Initializes the tablespace tag system.

Definition at line 845 of file trx0sys.cc.

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UNIV_INTERN dberr_t trx_sys_file_format_max_check

(

ulint

max_format_id

)

Check for the max file format tag stored on disk.

Returns

DB_SUCCESS or error code in: the max format id to check

Check for the max file format tag stored on disk. Note: If max_format_id is == UNIV_FORMAT_MAX + 1 then we only print a warning.

Returns

DB_SUCCESS or error code

Parameters

max_format_id

in: max format id to check

Definition at line 707 of file trx0sys.cc.

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UNIV_INTERN const char* trx_sys_file_format_max_get

(

void

)

Get the name representation of the file format from its id.

Returns

pointer to the max format name

Definition at line 835 of file trx0sys.cc.

UNIV_INTERN ibool trx_sys_file_format_max_set	(	ulint	format_id,
		const char **	name
	)

Set the file format id unconditionally except if it's already the same value.

Returns

TRUE if value updated out: max file format name or NULL if not needed.

Set the file format id unconditionally except if it's already the same value.

Returns

TRUE if value updated

Parameters

format_id	in: file format id
name	out: max file format name or NULL if not needed.

Definition at line 758 of file trx0sys.cc.

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UNIV_INTERN ibool trx_sys_file_format_max_upgrade	(	const char **	name,
		ulint	format_id
	)

Update the file format tag in the system tablespace only if the given format id is greater than the known max id.

Returns

TRUE if format_id was bigger than the known max id in: file format identifier

Update the file format tag in the system tablespace only if the given format id is greater than the known max id.

Returns

TRUE if format_id was bigger than the known max id

Parameters

name	out: max file format name
format_id	in: file format identifier

Definition at line 807 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_file_format_tag_init

(

void

)

Tags the system table space with minimum format id if it has not been tagged yet. WARNING: This function is only called during the startup and AFTER the redo log application during recovery has finished.

Definition at line 788 of file trx0sys.cc.

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UNIV_INLINE trx_id_t trx_sys_get_max_trx_id

(

void

)

Determines the maximum transaction id.

Returns

maximum currently allocated trx id; will be stale after the next call to trx_sys_get_new_trx_id()

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UNIV_INLINE ulint trx_sys_get_n_rw_trx

(

void

)

Get the number of transaction in the system, independent of their state.

Returns

count of transactions in trx_sys_t::trx_list

UNIV_INLINE trx_id_t trx_sys_get_new_trx_id

(

void

)

Allocates a new transaction id.

Returns

new, allocated trx id

UNIV_INLINE trx_rseg_t* trx_sys_get_nth_rseg	(	trx_sys_t *	sys,
		ulint	n
	)

Gets the pointer in the nth slot of the rseg array.

Returns

pointer to rseg object, NULL if slot not in use in: index of slot

Parameters

sys	in: trx system

UNIV_INLINE ibool trx_sys_hdr_page	(	ulint	space,
		ulint	page_no
	)

Checks if a page address is the trx sys header page.

Returns

TRUE if trx sys header page in: page number

Parameters

space

in: space

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UNIV_INTERN ib_bh_t* trx_sys_init_at_db_start

(

void

)

Creates and initializes the central memory structures for the transaction system. This is called when the database is started.

Returns

min binary heap of rsegs to purge

Definition at line 490 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_print_mysql_binlog_offset

(

void

)

Prints to stderr the MySQL binlog offset info in the trx system header if the magic number shows it valid.

Stores the MySQL binlog offset info in the trx system header if the magic number shows it valid, and print the info to stderr

Definition at line 258 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_print_mysql_master_log_pos

(

void

)

Prints to stderr the MySQL master log offset info in the trx system header if the magic number shows it valid.

Definition at line 308 of file trx0sys.cc.

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UNIV_INTERN void trx_sys_update_mysql_binlog_offset	(	const char *	file_name,
		ib_int64_t	offset,
		ulint	field,
		mtr_t *	mtr
	)

Updates the offset information about the end of the MySQL binlog entry which corresponds to the transaction just being committed. In a MySQL replication slave updates the latest master binlog position up to which replication has proceeded. in: mtr

Updates the offset information about the end of the MySQL binlog entry which corresponds to the transaction just being committed. In a MySQL replication slave updates the latest master binlog position up to which replication has proceeded.

Parameters

file_name	in: MySQL log file name
offset	in: position in that log file
field	in: offset of the MySQL log info field in the trx sys header
mtr	in: mtr

Definition at line 199 of file trx0sys.cc.

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UNIV_INLINE trx_sysf_t* trx_sysf_get

(

mtr_t *

mtr

)

Gets a pointer to the transaction system file copy and x-locks its page.

Returns

pointer to system file copy, page x-locked in: mtr

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UNIV_INTERN ulint trx_sysf_rseg_find_free

(

mtr_t *

mtr

)

Looks for a free slot for a rollback segment in the trx system file copy.

Returns

slot index or ULINT_UNDEFINED if not found in: mtr

Looks for a free slot for a rollback segment in the trx system file copy.

Returns

slot index or ULINT_UNDEFINED if not found

Parameters

mtr

in: mtr

Definition at line 362 of file trx0sys.cc.

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UNIV_INLINE ulint trx_sysf_rseg_get_page_no	(	trx_sysf_t *	sys_header,
		ulint	i,
		mtr_t *	mtr
	)

Gets the page number of the nth rollback segment slot in the trx system file copy.

Returns

page number, FIL_NULL if slot unused in: mtr

Parameters

sys_header	in: trx sys file copy
i	in: slot index == rseg id

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UNIV_INLINE ulint trx_sysf_rseg_get_space	(	trx_sysf_t *	sys_header,
		ulint	i,
		mtr_t *	mtr
	)

Gets the space of the nth rollback segment slot in the trx system file copy.

Returns

space id in: mtr

Parameters

sys_header	in: trx sys file copy
i	in: slot index == rseg id

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UNIV_INLINE void trx_sysf_rseg_set_page_no	(	trx_sysf_t *	sys_header,
		ulint	i,
		ulint	page_no,
		mtr_t *	mtr
	)

Sets the page number of the nth rollback segment slot in the trx system file copy. in: mtr

Parameters

sys_header	in: trx sys file copy
i	in: slot index == rseg id
page_no	in: page number, FIL_NULL if the slot is reset to unused

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UNIV_INLINE void trx_sysf_rseg_set_space	(	trx_sysf_t *	sys_header,
		ulint	i,
		ulint	space,
		mtr_t *	mtr
	)

Sets the space id of the nth rollback segment slot in the trx system file copy. in: mtr

Parameters

sys_header	in: trx sys file copy
i	in: slot index == rseg id
space	in: space id

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UNIV_INLINE void trx_write_trx_id	(	byte *	ptr,
		trx_id_t	id
	)

Writes a trx id to an index page. In case that the id size changes in some future version, this function should be used instead of mach_write_... in: id

Parameters

ptr	in: pointer to memory where written

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Variable Documentation

trx_sys_t* trx_sys

The transaction system

Definition at line 57 of file trx0sys.cc.

char trx_sys_mysql_bin_log_name[]

If this MySQL server uses binary logging, after InnoDB has been inited

and if it has done a crash recovery, we store the binlog file name and position here. Binlog file name

Definition at line 75 of file trx0sys.cc.

ib_int64_t trx_sys_mysql_bin_log_pos

Binlog file position, or -1 if unknown

Definition at line 77 of file trx0sys.cc.

char trx_sys_mysql_master_log_name[]

In a MySQL replication slave, in crash recovery we store the master log

file name and position here. Master binlog file name

Definition at line 63 of file trx0sys.cc.

ib_int64_t trx_sys_mysql_master_log_pos

Master binlog file position.  We have successfully got the updates

up to this position. -1 means that no crash recovery was needed, or there was no master log position info inside InnoDB.

Definition at line 67 of file trx0sys.cc.