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mariadb/storage/innobase/include/page0cur.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

285 lines
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/************************************************************************
The page cursor
(c) 1994-1996 Innobase Oy
Created 10/4/1994 Heikki Tuuri
*************************************************************************/
#ifndef page0cur_h
#define page0cur_h
#include "univ.i"
#include "page0types.h"
#include "page0page.h"
#include "rem0rec.h"
#include "data0data.h"
#include "mtr0mtr.h"
#define PAGE_CUR_ADAPT
/* Page cursor search modes; the values must be in this order! */
#define PAGE_CUR_G 1
#define PAGE_CUR_GE 2
#define PAGE_CUR_L 3
#define PAGE_CUR_LE 4
/*#define PAGE_CUR_LE_OR_EXTENDS 5*/ /* This is a search mode used in
"column LIKE 'abc%' ORDER BY column DESC";
we have to find strings which are <= 'abc' or
which extend it */
#ifdef UNIV_SEARCH_DEBUG
# define PAGE_CUR_DBG 6 /* As PAGE_CUR_LE, but skips search shortcut */
#endif /* UNIV_SEARCH_DEBUG */
#ifdef PAGE_CUR_ADAPT
# ifdef UNIV_SEARCH_PERF_STAT
extern ulint page_cur_short_succ;
# endif /* UNIV_SEARCH_PERF_STAT */
#endif /* PAGE_CUR_ADAPT */
/*************************************************************
Gets pointer to the page frame where the cursor is positioned. */
UNIV_INLINE
page_t*
page_cur_get_page(
/*==============*/
/* out: page */
page_cur_t* cur); /* in: page cursor */
/*************************************************************
Gets the record where the cursor is positioned. */
UNIV_INLINE
rec_t*
page_cur_get_rec(
/*=============*/
/* out: record */
page_cur_t* cur); /* in: page cursor */
/*************************************************************
Sets the cursor object to point before the first user record
on the page. */
UNIV_INLINE
void
page_cur_set_before_first(
/*======================*/
page_t* page, /* in: index page */
page_cur_t* cur); /* in: cursor */
/*************************************************************
Sets the cursor object to point after the last user record on
the page. */
UNIV_INLINE
void
page_cur_set_after_last(
/*====================*/
page_t* page, /* in: index page */
page_cur_t* cur); /* in: cursor */
/*************************************************************
Returns TRUE if the cursor is before first user record on page. */
UNIV_INLINE
ibool
page_cur_is_before_first(
/*=====================*/
/* out: TRUE if at start */
const page_cur_t* cur); /* in: cursor */
/*************************************************************
Returns TRUE if the cursor is after last user record. */
UNIV_INLINE
ibool
page_cur_is_after_last(
/*===================*/
/* out: TRUE if at end */
const page_cur_t* cur); /* in: cursor */
/**************************************************************
Positions the cursor on the given record. */
UNIV_INLINE
void
page_cur_position(
/*==============*/
rec_t* rec, /* in: record on a page */
page_cur_t* cur); /* in: page cursor */
/**************************************************************
Invalidates a page cursor by setting the record pointer NULL. */
UNIV_INLINE
void
page_cur_invalidate(
/*================*/
page_cur_t* cur); /* in: page cursor */
/**************************************************************
Moves the cursor to the next record on page. */
UNIV_INLINE
void
page_cur_move_to_next(
/*==================*/
page_cur_t* cur); /* in: cursor; must not be after last */
/**************************************************************
Moves the cursor to the previous record on page. */
UNIV_INLINE
void
page_cur_move_to_prev(
/*==================*/
page_cur_t* cur); /* in: cursor; must not before first */
/***************************************************************
Inserts a record next to page cursor. Returns pointer to inserted record if
succeed, i.e., enough space available, NULL otherwise. The cursor stays at
the same position. */
UNIV_INLINE
rec_t*
page_cur_tuple_insert(
/*==================*/
/* out: pointer to record if succeed, NULL
otherwise */
page_cur_t* cursor, /* in: a page cursor */
dtuple_t* tuple, /* in: pointer to a data tuple */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mini-transaction handle */
/***************************************************************
Inserts a record next to page cursor. Returns pointer to inserted record if
succeed, i.e., enough space available, NULL otherwise. The cursor stays at
the same position. */
UNIV_INLINE
rec_t*
page_cur_rec_insert(
/*================*/
/* out: pointer to record if succeed, NULL
otherwise */
page_cur_t* cursor, /* in: a page cursor */
rec_t* rec, /* in: record to insert */
dict_index_t* index, /* in: record descriptor */
ulint* offsets,/* in: rec_get_offsets(rec, index) */
mtr_t* mtr); /* in: mini-transaction handle */
/***************************************************************
Inserts a record next to page cursor. Returns pointer to inserted record if
succeed, i.e., enough space available, NULL otherwise. The record to be
inserted can be in a data tuple or as a physical record. The other parameter
must then be NULL. The cursor stays at the same position. */
rec_t*
page_cur_insert_rec_low(
/*====================*/
/* out: pointer to record if succeed, NULL
otherwise */
page_cur_t* cursor, /* in: a page cursor */
dtuple_t* tuple, /* in: pointer to a data tuple or NULL */
dict_index_t* index, /* in: record descriptor */
rec_t* rec, /* in: pointer to a physical record or NULL */
ulint* offsets,/* in: rec_get_offsets(rec, index) or NULL */
mtr_t* mtr); /* in: mini-transaction handle */
/*****************************************************************
Copies records from page to a newly created page, from a given record onward,
including that record. Infimum and supremum records are not copied. */
void
page_copy_rec_list_end_to_created_page(
/*===================================*/
page_t* new_page, /* in: index page to copy to */
page_t* page, /* in: index page */
rec_t* rec, /* in: first record to copy */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr); /* in: mtr */
/***************************************************************
Deletes a record at the page cursor. The cursor is moved to the
next record after the deleted one. */
void
page_cur_delete_rec(
/*================*/
page_cur_t* cursor, /* in: a page cursor */
dict_index_t* index, /* in: record descriptor */
const ulint* offsets,/* in: rec_get_offsets(cursor->rec, index) */
mtr_t* mtr); /* in: mini-transaction handle */
/********************************************************************
Searches the right position for a page cursor. */
UNIV_INLINE
ulint
page_cur_search(
/*============*/
/* out: number of matched fields on the left */
page_t* page, /* in: index page */
dict_index_t* index, /* in: record descriptor */
dtuple_t* tuple, /* in: data tuple */
ulint mode, /* in: PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G,
or PAGE_CUR_GE */
page_cur_t* cursor);/* out: page cursor */
/********************************************************************
Searches the right position for a page cursor. */
void
page_cur_search_with_match(
/*=======================*/
page_t* page, /* in: index page */
dict_index_t* index, /* in: record descriptor */
dtuple_t* tuple, /* in: data tuple */
ulint mode, /* in: PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G,
or PAGE_CUR_GE */
ulint* iup_matched_fields,
/* in/out: already matched fields in upper
limit record */
ulint* iup_matched_bytes,
/* in/out: already matched bytes in a field
not yet completely matched */
ulint* ilow_matched_fields,
/* in/out: already matched fields in lower
limit record */
ulint* ilow_matched_bytes,
/* in/out: already matched bytes in a field
not yet completely matched */
page_cur_t* cursor); /* out: page cursor */
/***************************************************************
Positions a page cursor on a randomly chosen user record on a page. If there
are no user records, sets the cursor on the infimum record. */
void
page_cur_open_on_rnd_user_rec(
/*==========================*/
page_t* page, /* in: page */
page_cur_t* cursor);/* in/out: page cursor */
/***************************************************************
Parses a log record of a record insert on a page. */
byte*
page_cur_parse_insert_rec(
/*======================*/
/* out: end of log record or NULL */
ibool is_short,/* in: TRUE if short inserts */
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 log record of copying a record list end to a new created page. */
byte*
page_parse_copy_rec_list_to_created_page(
/*=====================================*/
/* out: end of log record or NULL */
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 log record of a record delete on a page. */
byte*
page_cur_parse_delete_rec(
/*======================*/
/* out: pointer to record end or NULL */
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 */
/* Index page cursor */
struct page_cur_struct{
byte* rec; /* pointer to a record on page */
};
#ifndef UNIV_NONINL
#include "page0cur.ic"
#endif
#endif
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