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InnoDB: Zero fill newly created pages and deleted records to

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remove old junk and to improve compression ratio.
InnoDB: Make implicit type conversions explicit. (Bug #8826)
This commit is contained in:
marko@hundin.mysql.fi 2005-03-01 13:54:48 +02:00
commit 5faaf74818
11 changed files with 85 additions and 77 deletions
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7
innobase/include/page0cur.h
View file

@ -182,9 +182,10 @@ 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 */
mtr_t* mtr); /* in: mini-transaction handle */
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

2
innobase/include/page0page.h
View file

@ -528,7 +528,7 @@ page_mem_free(
/*==========*/
page_t* page, /* in: index page */
rec_t* rec, /* in: pointer to the (origin of) record */
dict_index_t* index); /* in: record descriptor */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/**************************************************************
The index page creation function. */

12
innobase/include/page0page.ic
View file

@ -777,20 +777,28 @@ page_mem_free(
/*==========*/
page_t* page, /* in: index page */
rec_t* rec, /* in: pointer to the (origin of) record */
dict_index_t* index) /* in: record descriptor */
const ulint* offsets)/* in: array returned by rec_get_offsets() */
{
rec_t* free;
ulint garbage;
ut_ad(rec_offs_validate(rec, NULL, offsets));
free = page_header_get_ptr(page, PAGE_FREE);
page_rec_set_next(rec, free);
page_header_set_ptr(page, PAGE_FREE, rec);
/* Clear the data bytes of the deleted record in order to improve
the compression ratio of the page and to make it easier to read
page dumps in corruption reports. The extra bytes of the record
cannot be cleared, because page_mem_alloc() needs them in order
to determine the size of the deleted record. */
memset(rec, 0, rec_offs_data_size(offsets));
garbage = page_header_get_field(page, PAGE_GARBAGE);
page_header_set_field(page, PAGE_GARBAGE,
garbage + rec_get_size(rec, index));
garbage + rec_offs_size(offsets));
}
#ifdef UNIV_MATERIALIZE

9
innobase/include/rem0rec.h
View file

@ -435,15 +435,6 @@ rec_offs_size(
/* out: size */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/**************************************************************
Returns the total size of a physical record. */
ulint
rec_get_size(
/*=========*/
/* out: size */
rec_t* rec, /* in: physical record */
dict_index_t* index); /* in: record descriptor */
/**************************************************************
Returns a pointer to the start of the record. */
UNIV_INLINE
byte*