diff options
Diffstat (limited to 'storage/innobase/include/page0page.h')
| -rw-r--r-- | storage/innobase/include/page0page.h | 101 |
1 files changed, 93 insertions, 8 deletions
diff --git a/storage/innobase/include/page0page.h b/storage/innobase/include/page0page.h index 53a58de229d..c2b9a833bda 100644 --- a/storage/innobase/include/page0page.h +++ b/storage/innobase/include/page0page.h @@ -63,9 +63,42 @@ typedef byte page_header_t; #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, + 0 if this info has been reset by a delete, for example */ -#define PAGE_DIRECTION 12 /* last insert direction: PAGE_LEFT, ... */ + +/** This 10-bit field is usually 0. In B-tree index pages of +ROW_FORMAT=REDUNDANT tables, this byte can contain garbage if the .ibd +file was created in MySQL 4.1.0 or if the table resides in the system +tablespace and was created before MySQL 4.1.1 or MySQL 4.0.14. +In this case, the FIL_PAGE_TYPE would be FIL_PAGE_INDEX. + +In ROW_FORMAT=COMPRESSED tables, this field is always 0, because +instant ADD COLUMN is not supported. + +In ROW_FORMAT=COMPACT and ROW_FORMAT=DYNAMIC tables, this field is +always 0, except in the root page of the clustered index after instant +ADD COLUMN. + +Instant ADD COLUMN will change FIL_PAGE_TYPE to FIL_PAGE_TYPE_INSTANT +and initialize the PAGE_INSTANT field to the original number of +fields in the clustered index (dict_index_t::n_core_fields). The most +significant bits are in the first byte, and the least significant 5 +bits are stored in the most significant 5 bits of PAGE_DIRECTION_B. + +These FIL_PAGE_TYPE_INSTANT and PAGE_INSTANT may be assigned even if +instant ADD COLUMN was not committed. Changes to these page header fields +are not undo-logged, but changes to the 'default value record' are. +If the server is killed and restarted, the page header fields could +remain set even though no 'default value record' is present. + +When the table becomes empty, the PAGE_INSTANT field and the +FIL_PAGE_TYPE can be reset and any 'default value record' be removed. */ +#define PAGE_INSTANT 12 + +/** last insert direction: PAGE_LEFT, .... +In ROW_FORMAT=REDUNDANT tables created before MySQL 4.1.1 or MySQL 4.0.14, +this byte can be garbage. */ +#define PAGE_DIRECTION_B 13 #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 */ @@ -251,6 +284,20 @@ page_rec_is_comp(const byte* rec) return(page_is_comp(page_align(rec))); } +# ifdef UNIV_DEBUG +/** Determine if the record is the 'default row' pseudo-record +in the clustered index. +@param[in] rec leaf page record on an index page +@return whether the record is the 'default row' pseudo-record */ +inline +bool +page_rec_is_default_row(const rec_t* rec) +{ + return rec_get_info_bits(rec, page_rec_is_comp(rec)) + & REC_INFO_MIN_REC_FLAG; +} +# endif /* UNIV_DEBUG */ + /** Determine the offset of the infimum record on the page. @param[in] page index page @return offset of the infimum record in record list, relative from page */ @@ -457,7 +504,7 @@ page_header_set_field( Returns the offset stored in the given header field. @return offset from the start of the page, or 0 */ UNIV_INLINE -ulint +uint16_t page_header_get_offs( /*=================*/ const page_t* page, /*!< in: page */ @@ -551,7 +598,7 @@ Gets the number of user records on page (the infimum and supremum records are not user records). @return number of user records */ UNIV_INLINE -ulint +uint16_t page_get_n_recs( /*============*/ const page_t* page); /*!< in: index page */ @@ -569,7 +616,7 @@ page_rec_get_n_recs_before( Gets the number of records in the heap. @return number of user records */ UNIV_INLINE -ulint +uint16_t page_dir_get_n_heap( /*================*/ const page_t* page); /*!< in: index page */ @@ -590,7 +637,7 @@ page_dir_set_n_heap( Gets the number of dir slots in directory. @return number of slots */ UNIV_INLINE -ulint +uint16_t page_dir_get_n_slots( /*=================*/ const page_t* page); /*!< in: index page */ @@ -865,7 +912,7 @@ Returns the sum of the sizes of the records in the record list excluding the infimum and supremum records. @return data in bytes */ UNIV_INLINE -ulint +uint16_t page_get_data_size( /*===============*/ const page_t* page); /*!< in: index page */ @@ -911,6 +958,45 @@ page_mem_free( const dict_index_t* index, /*!< in: index of rec */ const ulint* offsets);/*!< in: array returned by rec_get_offsets() */ + +/** Read the PAGE_DIRECTION field from a byte. +@param[in] ptr pointer to PAGE_DIRECTION_B +@return the value of the PAGE_DIRECTION field */ +inline +byte +page_ptr_get_direction(const byte* ptr); + +/** Set the PAGE_DIRECTION field. +@param[in] ptr pointer to PAGE_DIRECTION_B +@param[in] dir the value of the PAGE_DIRECTION field */ +inline +void +page_ptr_set_direction(byte* ptr, byte dir); + +/** Read the PAGE_DIRECTION field. +@param[in] page index page +@return the value of the PAGE_DIRECTION field */ +inline +byte +page_get_direction(const page_t* page) +{ + return page_ptr_get_direction(PAGE_HEADER + PAGE_DIRECTION_B + page); +} + +/** Read the PAGE_INSTANT field. +@param[in] page index page +@return the value of the PAGE_INSTANT field */ +inline +uint16_t +page_get_instant(const page_t* page); +/** Assign the PAGE_INSTANT field. +@param[in,out] page clustered index root page +@param[in] n original number of clustered index fields +@param[in,out] mtr mini-transaction */ +inline +void +page_set_instant(page_t* page, unsigned n, mtr_t* mtr); + /**********************************************************//** Create an uncompressed B-tree index page. @return pointer to the page */ @@ -1251,5 +1337,4 @@ page_warn_strict_checksum( #include "page0page.ic" - #endif |