mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-19 13:32:33 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/storage/innobase/include/page0page.h
aivanov@mysql.com d33b523271 Applied innodb-5.1-ss269 snapshot. 
Fixed BUGS:
  #3300: "UPDATE statement with no index column in where condition locks
    all rows"
    Implement semi-consistent read to reduce lock conflicts at the cost
    of breaking serializability.
    ha_innobase::unlock_row(): reset the "did semi consistent read" flag
    ha_innobase::was_semi_consistent_read(),
    ha_innobase::try_semi_consistent_read(): new methods
    row_prebuilt_t, row_create_prebuilt(): add field row_read_type for
    keeping track of semi-consistent reads
    row_vers_build_for_semi_consistent_read(),
    row_sel_build_committed_vers_for_mysql(): new functions
    row_search_for_mysql(): implement semi-consistent reads

  #9802: "Foreign key checks disallow alter table".
    Added test cases.

  #12456: "Cursor shows incorrect data - DML does not affect,
    probably caching"
    This patch implements a high-granularity read view to be used with
    cursors. In this high-granularity consistent read view modifications 
    done by the creating transaction after the cursor is created or 
   future transactions are not visible. But those modifications that 
   transaction did before the cursor was created are visible.

  #12701: "Support >4GB buffer pool and log files on 64-bit Windows"
    Do not call os_file_create_tmpfile() at runtime. Instead, create all
    tempfiles at startup and guard access to them with mutexes.

  #13778: "If FOREIGN_KEY_CHECKS=0, one can create inconsistent FOREIGN KEYs".
    When FOREIGN_KEY_CHECKS=0 we still need to check that datatypes between
    foreign key references are compatible.

  #14189: "VARBINARY and BINARY variables: trailing space ignored with InnoDB"
    innobase_init(): Assert that
    DATA_MYSQL_BINARY_CHARSET_COLL == my_charset_bin.number.
    dtype_get_pad_char(): Do not pad VARBINARY or BINARY columns.
    row_ins_cascade_calc_update_vec(): Refuse ON UPDATE CASCADE when trying
    to change the length of a VARBINARY column that refers to or is referenced
    by a BINARY column. BINARY columns are no longer padded on comparison,
    and thus they cannot be padded on storage either.

  #14747: "Race condition can cause btr_search_drop_page_hash_index() to crash"
    Note that buf_block_t::index should be protected by btr_search_latch
    or an s-latch or x-latch on the index page.
    btr_search_drop_page_hash_index(): Read block->index while holding
    btr_search_latch and use the cached value in the loop.  Remove some
    redundant assertions.

  #15108: "mysqld crashes when innodb_log_file_size is set > 4G"

  #15308: "Problem of Order with Enum Column in Primary Key"

  #15550: "mysqld crashes in printing a FOREIGN KEY error in InnoDB"
    row_ins_foreign_report_add_err(): When printing the parent record,
    use the index in the parent table rather than the index in the child table.

  #15653: "Slow inserts to InnoDB if many thousands of .ibd files"
    Keep track on unflushed modifications to file spaces.  When there are tens
    of thousands of file spaces, flushing all files in fil_flush_file_spaces()
    would be very slow.
    fil_flush_file_spaces(): Only flush unflushed file spaces.
    fil_space_t, fil_system_t: Add a list of unflushed spaces.

  #15991: "innodb-file-per-table + symlink database + rename = cr"
   os_file_handle_error(): Map the error codes EXDEV, ENOTDIR, and EISDIR
   to the new code OS_FILE_PATH_ERROR. Treat this code as OS_FILE_PATH_ERROR.
   This fixes the crash on RENAME TABLE when the .ibd file is a symbolic link
   to a different file system.

  #16157: "InnoDB crashes when main location settings are empty"
    This patch is from Heikki.

  #16298: "InnoDB segfaults in INSERTs in upgrade of 4.0 -> 5.0 tables
    with VARCHAR BINARY"
    dict_load_columns(): Set the charset-collation code
    DATA_MYSQL_BINARY_CHARSET_COLL for those binary string columns
    that lack a charset-collation code, i.e., the tables were created
    with an older version of MySQL/InnoDB than 4.1.2.

  #16229: "MySQL/InnoDB uses full explicit table locks in trigger processing"
    Take a InnoDB table lock only if user has explicitly requested a table
    lock. Added some additional comments to store_lock() and external_lock().

  #16387: "InnoDB crash when dropping a foreign key <table>_ibfk_0"
    Do not mistake TABLENAME_ibfk_0 for auto-generated id.
    dict_table_get_highest_foreign_id(): Ignore foreign constraint
    identifiers starting with the pattern TABLENAME_ibfk_0.

  #16582: "InnoDB: Error in an adaptive hash index pointer to page"
    Account for a race condition when dropping the adaptive hash index
    for a B-tree page.
    btr_search_drop_page_hash_index(): Retry the operation if a hash index
    with different parameters was built meanwhile.  Add diagnostics for the
    case that hash node pointers to the page remain.
    btr_search_info_update_hash(), btr_search_info_update_slow():
    Document the parameter "info" as in/out.

  #16814: "SHOW INNODB STATUS format error in LATEST FOREIGN KEY ERROR
    section"
    Add a missing newline to the LAST FOREIGN KEY ERROR section in SHOW
    INNODB STATUS output.
    dict_foreign_error_report(): Always print a newline after invoking
    dict_print_info_on_foreign_key_in_create_format().

  #16827: "Better InnoDB error message if ibdata files omitted from my.cnf"

  #17126: "CHECK TABLE on InnoDB causes a short hang during check of adaptive
    hash"
    CHECK TABLE blocking other queries, by releasing the btr_search_latch
    periodically during the adaptive hash table validation.

  #17405: "Valgrind: conditional jump or move depends on unititialised values"
    buf_block_init(): Reset magic_n, buf_fix_count and io_fix to avoid
    testing uninitialized variables.
2006-03-10 19:22:21 +03:00

802 lines
27 KiB
C
Raw Blame History

/******************************************************
Index page routines
(c) 1994-1996 Innobase Oy
Created 2/2/1994 Heikki Tuuri
*******************************************************/
#ifndef page0page_h
#define page0page_h
#include "univ.i"
#include "page0types.h"
#include "fil0fil.h"
#include "buf0buf.h"
#include "data0data.h"
#include "dict0dict.h"
#include "rem0rec.h"
#include "fsp0fsp.h"
#include "mtr0mtr.h"
#ifdef UNIV_MATERIALIZE
#undef UNIV_INLINE
#define UNIV_INLINE
#endif
/* PAGE HEADER
===========
Index page header starts at the first offset left free by the FIL-module */
typedef byte page_header_t;
#define PAGE_HEADER FSEG_PAGE_DATA /* index page header starts at this
offset */
/*-----------------------------*/
#define PAGE_N_DIR_SLOTS 0 /* number of slots in page directory */
#define PAGE_HEAP_TOP 2 /* pointer to record heap top */
#define PAGE_N_HEAP 4 /* number of records in the heap,
bit 15=flag: new-style compact page format */
#define PAGE_FREE 6 /* pointer to start of page free record list */
#define PAGE_GARBAGE 8 /* number of bytes in deleted records */
#define PAGE_LAST_INSERT 10 /* pointer to the last inserted record, or
NULL if this info has been reset by a delete,
for example */
#define PAGE_DIRECTION 12 /* last insert direction: PAGE_LEFT, ... */
#define PAGE_N_DIRECTION 14 /* number of consecutive inserts to the same
direction */
#define PAGE_N_RECS 16 /* number of user records on the page */
#define PAGE_MAX_TRX_ID 18 /* highest id of a trx which may have modified
a record on the page; a dulint; defined only
in secondary indexes; specifically, not in an
ibuf tree; NOTE: this may be modified only
when the thread has an x-latch to the page,
and ALSO an x-latch to btr_search_latch
if there is a hash index to the page! */
#define PAGE_HEADER_PRIV_END 26 /* end of private data structure of the page
header which are set in a page create */
/*----*/
#define PAGE_LEVEL 26 /* level of the node in an index tree; the
leaf level is the level 0 */
#define PAGE_INDEX_ID 28 /* index id where the page belongs */
#define PAGE_BTR_SEG_LEAF 36 /* file segment header for the leaf pages in
a B-tree: defined only on the root page of a
B-tree, but not in the root of an ibuf tree */
#define PAGE_BTR_IBUF_FREE_LIST PAGE_BTR_SEG_LEAF
#define PAGE_BTR_IBUF_FREE_LIST_NODE PAGE_BTR_SEG_LEAF
/* in the place of PAGE_BTR_SEG_LEAF and _TOP
there is a free list base node if the page is
the root page of an ibuf tree, and at the same
place is the free list node if the page is in
a free list */
#define PAGE_BTR_SEG_TOP (36 + FSEG_HEADER_SIZE)
/* file segment header for the non-leaf pages
in a B-tree: defined only on the root page of
a B-tree, but not in the root of an ibuf
tree */
/*----*/
#define PAGE_DATA (PAGE_HEADER + 36 + 2 * FSEG_HEADER_SIZE)
/* start of data on the page */
#define PAGE_OLD_INFIMUM (PAGE_DATA + 1 + REC_N_OLD_EXTRA_BYTES)
/* offset of the page infimum record on an
old-style page */
#define PAGE_OLD_SUPREMUM (PAGE_DATA + 2 + 2 * REC_N_OLD_EXTRA_BYTES + 8)
/* offset of the page supremum record on an
old-style page */
#define PAGE_OLD_SUPREMUM_END (PAGE_OLD_SUPREMUM + 9)
/* offset of the page supremum record end on
an old-style page */
#define PAGE_NEW_INFIMUM (PAGE_DATA + REC_N_NEW_EXTRA_BYTES)
/* offset of the page infimum record on a
new-style compact page */
#define PAGE_NEW_SUPREMUM (PAGE_DATA + 2 * REC_N_NEW_EXTRA_BYTES + 8)
/* offset of the page supremum record on a
new-style compact page */
#define PAGE_NEW_SUPREMUM_END (PAGE_NEW_SUPREMUM + 8)
/* offset of the page supremum record end on
a new-style compact page */
/*-----------------------------*/
/* Directions of cursor movement */
#define PAGE_LEFT 1
#define PAGE_RIGHT 2
#define PAGE_SAME_REC 3
#define PAGE_SAME_PAGE 4
#define PAGE_NO_DIRECTION 5
/* PAGE DIRECTORY
==============
*/
typedef byte page_dir_slot_t;
typedef page_dir_slot_t page_dir_t;
/* Offset of the directory start down from the page end. We call the
slot with the highest file address directory start, as it points to
the first record in the list of records. */
#define PAGE_DIR FIL_PAGE_DATA_END
/* We define a slot in the page directory as two bytes */
#define PAGE_DIR_SLOT_SIZE 2
/* The offset of the physically lower end of the directory, counted from
page end, when the page is empty */
#define PAGE_EMPTY_DIR_START (PAGE_DIR + 2 * PAGE_DIR_SLOT_SIZE)
/* The maximum and minimum number of records owned by a directory slot. The
number may drop below the minimum in the first and the last slot in the
directory. */
#define PAGE_DIR_SLOT_MAX_N_OWNED 8
#define PAGE_DIR_SLOT_MIN_N_OWNED 4
/*****************************************************************
Returns the max trx id field value. */
UNIV_INLINE
dulint
page_get_max_trx_id(
/*================*/
page_t* page); /* in: page */
/*****************************************************************
Sets the max trx id field value. */
void
page_set_max_trx_id(
/*================*/
page_t* page, /* in: page */
dulint trx_id);/* in: transaction id */
/*****************************************************************
Sets the max trx id field value if trx_id is bigger than the previous
value. */
UNIV_INLINE
void
page_update_max_trx_id(
/*===================*/
page_t* page, /* in: page */
dulint trx_id); /* in: transaction id */
/*****************************************************************
Reads the given header field. */
UNIV_INLINE
ulint
page_header_get_field(
/*==================*/
page_t* page, /* in: page */
ulint field); /* in: PAGE_N_DIR_SLOTS, ... */
/*****************************************************************
Sets the given header field. */
UNIV_INLINE
void
page_header_set_field(
/*==================*/
page_t* page, /* in: page */
ulint field, /* in: PAGE_N_DIR_SLOTS, ... */
ulint val); /* in: value */
/*****************************************************************
Returns the pointer stored in the given header field. */
UNIV_INLINE
byte*
page_header_get_ptr(
/*================*/
/* out: pointer or NULL */
page_t* page, /* in: page */
ulint field); /* in: PAGE_FREE, ... */
/*****************************************************************
Sets the pointer stored in the given header field. */
UNIV_INLINE
void
page_header_set_ptr(
/*================*/
page_t* page, /* in: page */
ulint field, /* in: PAGE_FREE, ... */
byte* ptr); /* in: pointer or NULL*/
/*****************************************************************
Resets the last insert info field in the page header. Writes to mlog
about this operation. */
UNIV_INLINE
void
page_header_reset_last_insert(
/*==========================*/
page_t* page, /* in: page */
mtr_t* mtr); /* in: mtr */
/****************************************************************
Gets the first record on the page. */
UNIV_INLINE
rec_t*
page_get_infimum_rec(
/*=================*/
/* out: the first record in record list */
page_t* page); /* in: page which must have record(s) */
/****************************************************************
Gets the last record on the page. */
UNIV_INLINE
rec_t*
page_get_supremum_rec(
/*==================*/
/* out: the last record in record list */
page_t* page); /* in: page which must have record(s) */
/****************************************************************
Returns the middle record of record list. If there are an even number
of records in the list, returns the first record of upper half-list. */
rec_t*
page_get_middle_rec(
/*================*/
/* out: middle record */
page_t* page); /* in: page */
/*****************************************************************
Compares a data tuple to a physical record. Differs from the function
cmp_dtuple_rec_with_match in the way that the record must reside on an
index page, and also page infimum and supremum records can be given in
the parameter rec. These are considered as the negative infinity and
the positive infinity in the alphabetical order. */
UNIV_INLINE
int
page_cmp_dtuple_rec_with_match(
/*===========================*/
/* out: 1, 0, -1, if dtuple is greater, equal,
less than rec, respectively, when only the
common first fields are compared */
dtuple_t* dtuple, /* in: data tuple */
rec_t* rec, /* in: physical record on a page; may also
be page infimum or supremum, in which case
matched-parameter values below are not
affected */
const ulint* offsets,/* in: array returned by rec_get_offsets() */
ulint* matched_fields, /* in/out: number of already completely
matched fields; when function returns
contains the value for current comparison */
ulint* matched_bytes); /* in/out: number of already matched
bytes within the first field not completely
matched; when function returns contains the
value for current comparison */
/*****************************************************************
Gets the number of user records on page (the infimum and supremum records
are not user records). */
UNIV_INLINE
ulint
page_get_n_recs(
/*============*/
/* out: number of user records */
page_t* page); /* in: index page */
/*******************************************************************
Returns the number of records before the given record in chain.
The number includes infimum and supremum records. */
ulint
page_rec_get_n_recs_before(
/*=======================*/
/* out: number of records */
rec_t* rec); /* in: the physical record */
/*****************************************************************
Gets the number of records in the heap. */
UNIV_INLINE
ulint
page_dir_get_n_heap(
/*================*/
/* out: number of user records */
page_t* page); /* in: index page */
/*****************************************************************
Sets the number of records in the heap. */
UNIV_INLINE
void
page_dir_set_n_heap(
/*================*/
page_t* page, /* in: index page */
ulint n_heap);/* in: number of records */
/*****************************************************************
Gets the number of dir slots in directory. */
UNIV_INLINE
ulint
page_dir_get_n_slots(
/*=================*/
/* out: number of slots */
page_t* page); /* in: index page */
/*****************************************************************
Sets the number of dir slots in directory. */
UNIV_INLINE
void
page_dir_set_n_slots(
/*=================*/
/* out: number of slots */
page_t* page, /* in: index page */
ulint n_slots);/* in: number of slots */
/*****************************************************************
Gets pointer to nth directory slot. */
UNIV_INLINE
page_dir_slot_t*
page_dir_get_nth_slot(
/*==================*/
/* out: pointer to dir slot */
page_t* page, /* in: index page */
ulint n); /* in: position */
/******************************************************************
Used to check the consistency of a record on a page. */
UNIV_INLINE
ibool
page_rec_check(
/*===========*/
/* out: TRUE if succeed */
rec_t* rec); /* in: record */
/*******************************************************************
Gets the record pointed to by a directory slot. */
UNIV_INLINE
rec_t*
page_dir_slot_get_rec(
/*==================*/
/* out: pointer to record */
page_dir_slot_t* slot); /* in: directory slot */
/*******************************************************************
This is used to set the record offset in a directory slot. */
UNIV_INLINE
void
page_dir_slot_set_rec(
/*==================*/
page_dir_slot_t* slot, /* in: directory slot */
rec_t* rec); /* in: record on the page */
/*******************************************************************
Gets the number of records owned by a directory slot. */
UNIV_INLINE
ulint
page_dir_slot_get_n_owned(
/*======================*/
/* out: number of records */
page_dir_slot_t* slot); /* in: page directory slot */
/*******************************************************************
This is used to set the owned records field of a directory slot. */
UNIV_INLINE
void
page_dir_slot_set_n_owned(
/*======================*/
page_dir_slot_t* slot, /* in: directory slot */
ulint n); /* in: number of records owned
by the slot */
/****************************************************************
Calculates the space reserved for directory slots of a given
number of records. The exact value is a fraction number
n * PAGE_DIR_SLOT_SIZE / PAGE_DIR_SLOT_MIN_N_OWNED, and it is
rounded upwards to an integer. */
UNIV_INLINE
ulint
page_dir_calc_reserved_space(
/*=========================*/
ulint n_recs); /* in: number of records */
/*******************************************************************
Looks for the directory slot which owns the given record. */
ulint
page_dir_find_owner_slot(
/*=====================*/
/* out: the directory slot number */
rec_t* rec); /* in: the physical record */
/****************************************************************
Determine whether the page is in new-style compact format. */
UNIV_INLINE
ulint
page_is_comp(
/*=========*/
/* out: nonzero if the page is in compact
format, zero if it is in old-style format */
page_t* page); /* in: index page */
/****************************************************************
TRUE if the record is on a page in compact format. */
UNIV_INLINE
ulint
page_rec_is_comp(
/*=============*/
/* out: nonzero if in compact format */
const rec_t* rec); /* in: record */
/****************************************************************
Gets the pointer to the next record on the page. */
UNIV_INLINE
rec_t*
page_rec_get_next(
/*==============*/
/* out: pointer to next record */
rec_t* rec); /* in: pointer to record, must not be page
supremum */
/****************************************************************
Sets the pointer to the next record on the page. */
UNIV_INLINE
void
page_rec_set_next(
/*==============*/
rec_t* rec, /* in: pointer to record, must not be
page supremum */
rec_t* next); /* in: pointer to next record, must not
be page infimum */
/****************************************************************
Gets the pointer to the previous record. */
UNIV_INLINE
rec_t*
page_rec_get_prev(
/*==============*/
/* out: pointer to previous record */
rec_t* rec); /* in: pointer to record,
must not be page infimum */
/****************************************************************
TRUE if the record is a user record on the page. */
UNIV_INLINE
ibool
page_rec_is_user_rec_low(
/*=====================*/
/* out: TRUE if a user record */
ulint offset);/* in: record offset on page */
/****************************************************************
TRUE if the record is the supremum record on a page. */
UNIV_INLINE
ibool
page_rec_is_supremum_low(
/*=====================*/
/* out: TRUE if the supremum record */
ulint offset);/* in: record offset on page */
/****************************************************************
TRUE if the record is the infimum record on a page. */
UNIV_INLINE
ibool
page_rec_is_infimum_low(
/*====================*/
/* out: TRUE if the infimum record */
ulint offset);/* in: record offset on page */
/****************************************************************
TRUE if the record is a user record on the page. */
UNIV_INLINE
ibool
page_rec_is_user_rec(
/*=================*/
/* out: TRUE if a user record */
const rec_t* rec); /* in: record */
/****************************************************************
TRUE if the record is the supremum record on a page. */
UNIV_INLINE
ibool
page_rec_is_supremum(
/*=================*/
/* out: TRUE if the supremum record */
const rec_t* rec); /* in: record */
/****************************************************************
TRUE if the record is the infimum record on a page. */
UNIV_INLINE
ibool
page_rec_is_infimum(
/*================*/
/* out: TRUE if the infimum record */
const rec_t* rec); /* in: record */
/*******************************************************************
Looks for the record which owns the given record. */
UNIV_INLINE
rec_t*
page_rec_find_owner_rec(
/*====================*/
/* out: the owner record */
rec_t* rec); /* in: the physical record */
/***************************************************************************
This is a low-level operation which is used in a database index creation
to update the page number of a created B-tree to a data dictionary
record. */
void
page_rec_write_index_page_no(
/*=========================*/
rec_t* rec, /* in: record to update */
ulint i, /* in: index of the field to update */
ulint page_no,/* in: value to write */
mtr_t* mtr); /* in: mtr */
/****************************************************************
Returns the maximum combined size of records which can be inserted on top
of record heap. */
UNIV_INLINE
ulint
page_get_max_insert_size(
/*=====================*/
/* out: maximum combined size for inserted records */
page_t* page, /* in: index page */
ulint n_recs); /* in: number of records */
/****************************************************************
Returns the maximum combined size of records which can be inserted on top
of record heap if page is first reorganized. */
UNIV_INLINE
ulint
page_get_max_insert_size_after_reorganize(
/*======================================*/
/* out: maximum combined size for inserted records */
page_t* page, /* in: index page */
ulint n_recs);/* in: number of records */
/*****************************************************************
Calculates free space if a page is emptied. */
UNIV_INLINE
ulint
page_get_free_space_of_empty(
/*=========================*/
/* out: free space */
ulint comp) /* in: nonzero=compact page format */
__attribute__((const));
/****************************************************************
Returns the sum of the sizes of the records in the record list
excluding the infimum and supremum records. */
UNIV_INLINE
ulint
page_get_data_size(
/*===============*/
/* out: data in bytes */
page_t* page); /* in: index page */
/****************************************************************
Allocates a block of memory from an index page. */
byte*
page_mem_alloc(
/*===========*/
/* out: pointer to start of allocated
buffer, or NULL if allocation fails */
page_t* page, /* in: index page */
ulint need, /* in: number of bytes needed */
dict_index_t* index, /* in: record descriptor */
ulint* heap_no);/* out: this contains the heap number
of the allocated record
if allocation succeeds */
/****************************************************************
Puts a record to free list. */
UNIV_INLINE
void
page_mem_free(
/*==========*/
page_t* page, /* in: index page */
rec_t* rec, /* in: pointer to the (origin of) record */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/**************************************************************
The index page creation function. */
page_t*
page_create(
/*========*/
/* out: pointer to the page */
buf_frame_t* frame, /* in: a buffer frame where the page is
created */
mtr_t* mtr, /* in: mini-transaction handle */
ulint comp); /* in: nonzero=compact page format */
/*****************************************************************
Differs from page_copy_rec_list_end, because this function does not
touch the lock table and max trx id on page. */
void
page_copy_rec_list_end_no_locks(
/*============================*/
page_t* new_page, /* in: index page to copy to */
page_t* page, /* in: index page */
rec_t* rec, /* in: record on page */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Copies records from page to new_page, from the given record onward,
including that record. Infimum and supremum records are not copied.
The records are copied to the start of the record list on new_page. */
void
page_copy_rec_list_end(
/*===================*/
page_t* new_page, /* in: index page to copy to */
page_t* page, /* in: index page */
rec_t* rec, /* in: record on page */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Copies records from page to new_page, up to the given record, NOT
including that record. Infimum and supremum records are not copied.
The records are copied to the end of the record list on new_page. */
void
page_copy_rec_list_start(
/*=====================*/
page_t* new_page, /* in: index page to copy to */
page_t* page, /* in: index page */
rec_t* rec, /* in: record on page */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Deletes records from a page from a given record onward, including that record.
The infimum and supremum records are not deleted. */
void
page_delete_rec_list_end(
/*=====================*/
page_t* page, /* in: index page */
rec_t* rec, /* in: record on page */
dict_index_t* index, /* in: record descriptor */
ulint n_recs, /* in: number of records to delete,
or ULINT_UNDEFINED if not known */
ulint size, /* in: the sum of the sizes of the
records in the end of the chain to
delete, or ULINT_UNDEFINED if not known */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Deletes records from page, up to the given record, NOT including
that record. Infimum and supremum records are not deleted. */
void
page_delete_rec_list_start(
/*=======================*/
page_t* page, /* in: index page */
rec_t* rec, /* in: record on page */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Moves record list end to another page. Moved records include
split_rec. */
void
page_move_rec_list_end(
/*===================*/
page_t* new_page, /* in: index page where to move */
page_t* page, /* in: index page */
rec_t* split_rec, /* in: first record to move */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/*****************************************************************
Moves record list start to another page. Moved records do not include
split_rec. */
void
page_move_rec_list_start(
/*=====================*/
page_t* new_page, /* in: index page where to move */
page_t* page, /* in: index page */
rec_t* split_rec, /* in: first record not to move */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/********************************************************************
Splits a directory slot which owns too many records. */
void
page_dir_split_slot(
/*================*/
page_t* page, /* in: the index page in question */
ulint slot_no); /* in: the directory slot */
/*****************************************************************
Tries to balance the given directory slot with too few records
with the upper neighbor, so that there are at least the minimum number
of records owned by the slot; this may result in the merging of
two slots. */
void
page_dir_balance_slot(
/*==================*/
page_t* page, /* in: index page */
ulint slot_no); /* in: the directory slot */
/**************************************************************
Parses a log record of a record list end or start deletion. */
byte*
page_parse_delete_rec_list(
/*=======================*/
/* out: end of log record or NULL */
byte type, /* in: MLOG_LIST_END_DELETE,
MLOG_LIST_START_DELETE,
MLOG_COMP_LIST_END_DELETE or
MLOG_COMP_LIST_START_DELETE */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
dict_index_t* index, /* in: record descriptor */
page_t* page, /* in: page or NULL */
mtr_t* mtr); /* in: mtr or NULL */
/***************************************************************
Parses a redo log record of creating a page. */
byte*
page_parse_create(
/*==============*/
/* out: end of log record or NULL */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
ulint comp, /* in: nonzero=compact page format */
page_t* page, /* in: page or NULL */
mtr_t* mtr); /* in: mtr or NULL */
/****************************************************************
Prints record contents including the data relevant only in
the index page context. */
void
page_rec_print(
/*===========*/
rec_t* rec, /* in: physical record */
const ulint* offsets);/* in: record descriptor */
/*******************************************************************
This is used to print the contents of the directory for
debugging purposes. */
void
page_dir_print(
/*===========*/
page_t* page, /* in: index page */
ulint pr_n); /* in: print n first and n last entries */
/*******************************************************************
This is used to print the contents of the page record list for
debugging purposes. */
void
page_print_list(
/*============*/
page_t* page, /* in: index page */
dict_index_t* index, /* in: dictionary index of the page */
ulint pr_n); /* in: print n first and n last entries */
/*******************************************************************
Prints the info in a page header. */
void
page_header_print(
/*==============*/
page_t* page);
/*******************************************************************
This is used to print the contents of the page for
debugging purposes. */
void
page_print(
/*=======*/
page_t* page, /* in: index page */
dict_index_t* index, /* in: dictionary index of the page */
ulint dn, /* in: print dn first and last entries
in directory */
ulint rn); /* in: print rn first and last records
in directory */
/*******************************************************************
The following is used to validate a record on a page. This function
differs from rec_validate as it can also check the n_owned field and
the heap_no field. */
ibool
page_rec_validate(
/*==============*/
/* out: TRUE if ok */
rec_t* rec, /* in: physical record */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/*******************************************************************
Checks that the first directory slot points to the infimum record and
the last to the supremum. This function is intended to track if the
bug fixed in 4.0.14 has caused corruption to users' databases. */
void
page_check_dir(
/*===========*/
page_t* page); /* in: index page */
/*******************************************************************
This function checks the consistency of an index page when we do not
know the index. This is also resilient so that this should never crash
even if the page is total garbage. */
ibool
page_simple_validate(
/*=================*/
/* out: TRUE if ok */
page_t* page); /* in: index page */
/*******************************************************************
This function checks the consistency of an index page. */
ibool
page_validate(
/*==========*/
/* out: TRUE if ok */
page_t* page, /* in: index page */
dict_index_t* index); /* in: data dictionary index containing
the page record type definition */
/*******************************************************************
Looks in the page record list for a record with the given heap number. */
rec_t*
page_find_rec_with_heap_no(
/*=======================*/
/* out: record, NULL if not found */
page_t* page, /* in: index page */
ulint heap_no);/* in: heap number */
#ifdef UNIV_MATERIALIZE
#undef UNIV_INLINE
#define UNIV_INLINE UNIV_INLINE_ORIGINAL
#endif
#ifndef UNIV_NONINL
#include "page0page.ic"
#endif
#endif
Reference in a new issue View git blame Copy permalink