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f29b8ee0c3
INNODB_ZIP and INNODB_ZIP_RESET to
INNODB_COMPRESSION and INNODB_COMPRESSION_RESET,
and remove the statistics of the buddy system.
This change was discussed with Ken. It makes the tables shorter
and easier to understand. The removed data will be represented in
the tables INNODB_COMPRESSION_BUDDY and INNODB_COMPRESSION_BUDDY_RESET
that will be added later.
i_s_innodb_zip, i_s_innodb_zip_reset, i_s_zip_fields_info[],
i_s_zip_fill_low(), i_s_zip_fill(), i_s_zip_reset_fill(),
i_s_zip_init(), i_s_zip_reset_init(): Replace "zip" with "compression".
i_s_compression_fields_info[]: Remove "used", "free",
"relocated", "relocated_usec". In "compressed_usec" and "decompressed_usec",
replace microseconds with seconds ("usec" with "sec").
page_zip_decompress(): Correct a typo in the function comment.
PAGE_ZIP_SSIZE_BITS, PAGE_ZIP_NUM_SSIZE: New constants.
page_zip_stat_t, page_zip_stat: Statistics of the compression, grouped
by page size.
page_zip_simple_validate(): Assert that page_zip->ssize is reasonable.
141 lines
4.6 KiB
C
141 lines
4.6 KiB
C
/******************************************************
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Index page routines
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(c) 1994-1996 Innobase Oy
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Created 2/2/1994 Heikki Tuuri
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*******************************************************/
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#ifndef page0types_h
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#define page0types_h
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#include "univ.i"
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#include "dict0types.h"
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#include "mtr0types.h"
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/* Type of the index page */
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/* The following define eliminates a name collision on HP-UX */
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#define page_t ib_page_t
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typedef byte page_t;
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typedef struct page_search_struct page_search_t;
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typedef struct page_cur_struct page_cur_t;
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typedef byte page_zip_t;
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typedef struct page_zip_des_struct page_zip_des_t;
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/* The following definitions would better belong to page0zip.h,
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but we cannot include page0zip.h from rem0rec.ic, because
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page0*.h includes rem0rec.h and may include rem0rec.ic. */
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#define PAGE_ZIP_SSIZE_BITS 3
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#define PAGE_ZIP_MIN_SIZE_SHIFT 10 /* log2 of smallest compressed size */
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#define PAGE_ZIP_MIN_SIZE (1 << PAGE_ZIP_MIN_SIZE_SHIFT)
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#define PAGE_ZIP_NUM_SSIZE (UNIV_PAGE_SIZE_SHIFT - PAGE_ZIP_MIN_SIZE_SHIFT + 2)
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#if PAGE_ZIP_NUM_SSIZE > (1 << PAGE_ZIP_SSIZE_BITS)
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# error "PAGE_ZIP_NUM_SSIZE > (1 << PAGE_ZIP_SSIZE_BITS)"
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#endif
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/* Compressed page descriptor */
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struct page_zip_des_struct
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{
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page_zip_t* data; /* compressed page data */
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#ifdef UNIV_DEBUG
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unsigned m_start:16; /* start offset of modification log */
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#endif /* UNIV_DEBUG */
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unsigned m_end:16; /* end offset of modification log */
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unsigned m_nonempty:1; /* TRUE if the modification log
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is not empty */
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unsigned n_blobs:12; /* number of externally stored
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columns on the page; the maximum
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is 744 on a 16 KiB page */
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unsigned ssize:PAGE_ZIP_SSIZE_BITS;
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/* 0 or compressed page size;
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the size in bytes is
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PAGE_ZIP_MIN_SIZE << (ssize - 1). */
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};
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/** Compression statistics for a given page size */
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struct page_zip_stat_struct {
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/** Number of page compressions */
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ulint compressed;
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/** Number of successful page compressions */
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ulint compressed_ok;
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/** Number of page decompressions */
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ulint decompressed;
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/** Duration of page compressions in microseconds */
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ib_uint64_t compressed_usec;
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/** Duration of page decompressions in microseconds */
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ib_uint64_t decompressed_usec;
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};
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typedef struct page_zip_stat_struct page_zip_stat_t;
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/** Statistics on compression, indexed by page_zip_des_t::ssize - 1 */
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extern page_zip_stat_t page_zip_stat[PAGE_ZIP_NUM_SSIZE - 1];
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/**************************************************************************
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Write data to the compressed page. The data must already be written to
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the uncompressed page. */
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UNIV_INTERN
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void
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page_zip_write(
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/*===========*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record whose data is being written */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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lint offset, /* in: start address of the block,
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relative to rec */
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ulint length) /* in: length of the data */
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__attribute__((nonnull));
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/**************************************************************************
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Write the "deleted" flag of a record on a compressed page. The flag must
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already have been written on the uncompressed page. */
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UNIV_INTERN
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void
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page_zip_rec_set_deleted(
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/*=====================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record on the uncompressed page */
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ulint flag) /* in: the deleted flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**************************************************************************
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Write the "owned" flag of a record on a compressed page. The n_owned field
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must already have been written on the uncompressed page. */
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UNIV_INTERN
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void
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page_zip_rec_set_owned(
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/*===================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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const byte* rec, /* in: record on the uncompressed page */
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ulint flag) /* in: the owned flag (nonzero=TRUE) */
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__attribute__((nonnull));
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/**************************************************************************
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Shift the dense page directory when a record is deleted. */
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UNIV_INTERN
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void
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page_zip_dir_delete(
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/*================*/
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page_zip_des_t* page_zip,/* in/out: compressed page */
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byte* rec, /* in: deleted record */
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dict_index_t* index, /* in: index of rec */
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const ulint* offsets,/* in: rec_get_offsets(rec) */
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const byte* free) /* in: previous start of the free list */
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__attribute__((nonnull(1,2,3,4)));
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/**************************************************************************
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Add a slot to the dense page directory. */
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UNIV_INTERN
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void
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page_zip_dir_add_slot(
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/*==================*/
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page_zip_des_t* page_zip, /* in/out: compressed page */
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ulint is_clustered) /* in: nonzero for clustered index,
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zero for others */
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__attribute__((nonnull));
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#endif
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