Compressed page interface. More...

#include "page0zip.h"
#include "page0size.h"
#include <zlib.h>
#include "btr0cur.h"
#include "dict0dict.h"
#include "log0recv.h"
#include "mtr0log.h"
#include "page0page.h"
#include "page0types.h"
#include "btr0sea.h"
#include "buf0buf.h"
#include "buf0lru.h"
#include "dict0boot.h"
#include "lock0lock.h"
#include "srv0mon.h"
#include "srv0srv.h"
#include "ut0crc32.h"
#include <algorithm>
#include <map>

Macros
#define	ASSERT_ZERO(b, s)
	Assert that a block of memory is filled with zero bytes. More...

#define	ASSERT_ZERO_BLOB(b) ut_ad(!memcmp(b, field_ref_zero, sizeof field_ref_zero))
	Assert that a BLOB pointer is filled with zero bytes. More...

#define	PAGE_ZIP_COMPRESS_DBG
	Symbol for enabling compression and decompression diagnostics. More...

#define	deflate(strm, flush) page_zip_compress_deflate(logfile, strm, flush)
	Debug wrapper for the zlib compression routine deflate(). More...

#define	FILE_LOGFILE FILE *logfile,
	Declaration of the logfile parameter. More...

#define	LOGFILE logfile,
	The logfile parameter. More...

Functions
ulint	page_zip_empty_size (ulint n_fields, ulint zip_size)
	Determine the guaranteed free space on an empty page. More...

bool	page_zip_is_too_big (const dict_index_t index, const dtuple_t entry)
	Check whether a tuple is too big for compressed table. More...

static byte *	page_zip_dir_find (page_zip_des_t *page_zip, ulint offset)
	Find the slot of the given non-free record in the dense page directory. More...

static void	page_zip_compress_write_log (const page_zip_des_t page_zip, const page_t page, dict_index_t index, mtr_t mtr)
	Write a log record of compressing an index page. More...

static ulint	page_zip_get_n_prev_extern (const page_zip_des_t page_zip, const rec_t rec, const dict_index_t *index)
	Determine how many externally stored columns are contained in existing records with smaller heap_no than rec. More...

static byte *	page_zip_fixed_field_encode (byte *buf, ulint val)
	Encode the length of a fixed-length column. More...

ulint	page_zip_fields_encode (ulint n, const dict_index_t index, ulint trx_id_pos, byte buf)
	Write the index information for the compressed page. More...

static void	page_zip_dir_encode (const page_t page, byte buf, const rec_t **recs)
	Populate the dense page directory from the sparse directory. More...

static int	page_zip_compress_deflate (FILE *logfile, z_streamp strm, int flush)
	Wrapper for deflate(). More...

static int	page_zip_compress_node_ptrs (FILE_LOGFILE z_stream c_stream, const rec_t recs, ulint n_dense, dict_index_t index, byte storage, mem_heap_t heap)
	Compress the records of a node pointer page. More...

static int	page_zip_compress_sec (FILE_LOGFILE z_stream c_stream, const rec_t *recs, ulint n_dense)
	Compress the records of a leaf node of a secondary index. More...

static int	page_zip_compress_clust_ext (FILE_LOGFILE z_stream c_stream, const dict_index_t index, const rec_t rec, const ulint offsets, ulint trx_id_col, byte deleted, byte storage, byte *externs, ulint n_blobs)
	Compress a record of a leaf node of a clustered index that contains externally stored columns. More...

static int	page_zip_compress_clust (FILE_LOGFILE z_stream c_stream, const rec_t recs, ulint n_dense, dict_index_t index, ulint n_blobs, ulint trx_id_col, byte deleted, byte storage, mem_heap_t heap)
	Compress the records of a leaf node of a clustered index. More...

bool	page_zip_compress (page_zip_des_t page_zip, const page_t page, dict_index_t index, ulint level, mtr_t mtr)
	Compress a page. More...

bool	page_zip_decompress (page_zip_des_t page_zip, page_t page, bool all)
	Decompress a page. More...

static void	page_zip_header_cmp (const page_zip_des_t page_zip, const byte page)
	Assert that the compressed and decompressed page headers match. More...

static byte *	page_zip_write_rec_ext (page_zip_des_t page_zip, const page_t page, const byte rec, const dict_index_t index, const ulint offsets, ulint create, ulint trx_id_col, ulint heap_no, byte storage, byte *data)
	Write a record on the compressed page that contains externally stored columns. More...

void	page_zip_write_rec (page_zip_des_t page_zip, const byte rec, const dict_index_t index, const ulint offsets, ulint create)
	Write an entire record on the compressed page. More...

byte *	page_zip_parse_write_blob_ptr (byte ptr, byte end_ptr, page_t page, page_zip_des_t page_zip)
	Parses a log record of writing a BLOB pointer of a record. More...

void	page_zip_write_blob_ptr (page_zip_des_t page_zip, const byte rec, const dict_index_t index, const ulint offsets, ulint n, mtr_t *mtr)
	Write a BLOB pointer of a record on the leaf page of a clustered index. More...

byte *	page_zip_parse_write_node_ptr (byte ptr, byte end_ptr, page_t page, page_zip_des_t page_zip)
	Parses a log record of writing the node pointer of a record. More...

void	page_zip_write_node_ptr (page_zip_des_t page_zip, byte rec, ulint size, ulint ptr, mtr_t *mtr)
	Write the node pointer of a record on a non-leaf compressed page. More...

void	page_zip_write_trx_id_and_roll_ptr (page_zip_des_t page_zip, byte rec, const ulint *offsets, ulint trx_id_col, trx_id_t trx_id, roll_ptr_t roll_ptr)
	Write the trx_id and roll_ptr of a record on a B-tree leaf node page. More...

static void	page_zip_clear_rec (page_zip_des_t page_zip, byte rec, const dict_index_t index, const ulint offsets)
	Clear an area on the uncompressed and compressed page. More...

void	page_zip_rec_set_deleted (page_zip_des_t page_zip, const byte rec, bool flag)
	Write the "deleted" flag of a record on a compressed page. More...

void	page_zip_rec_set_owned (page_zip_des_t page_zip, const byte rec, ulint flag)
	Write the "owned" flag of a record on a compressed page. More...

void	page_zip_dir_insert (page_zip_des_t page_zip, const byte prev_rec, const byte free_rec, byte rec)
	Insert a record to the dense page directory. More...

void	page_zip_dir_delete (page_zip_des_t page_zip, byte rec, const dict_index_t index, const ulint offsets, const byte *free)
	Shift the dense page directory and the array of BLOB pointers when a record is deleted. More...

void	page_zip_dir_add_slot (page_zip_des_t *page_zip, bool is_clustered)
	Add a slot to the dense page directory. More...

byte *	page_zip_parse_write_header (byte ptr, byte end_ptr, page_t page, page_zip_des_t page_zip)
	Parses a log record of writing to the header of a page. More...

void	page_zip_write_header_log (const byte data, ulint length, mtr_t mtr)
	Write a log record of writing to the uncompressed header portion of a page. More...

bool	page_zip_reorganize (buf_block_t block, dict_index_t index, mtr_t *mtr)
	Reorganize and compress a page. More...

void	page_zip_copy_recs (page_zip_des_t page_zip, page_t page, const page_zip_des_t src_zip, const page_t src, dict_index_t index, mtr_t mtr)
	Copy the records of a page byte for byte. More...

byte *	page_zip_parse_compress (byte ptr, byte end_ptr, page_t page, page_zip_des_t page_zip)
	Parses a log record of compressing an index page. More...

Variables
const byte	field_ref_zero [FIELD_REF_SIZE]
	A BLOB field reference full of zero, for use in assertions and tests. More...

page_zip_stat_t	page_zip_stat [PAGE_ZIP_SSIZE_MAX]
	Statistics on compression, indexed by page_zip_des_t::ssize - 1. More...

page_zip_stat_per_index_t	page_zip_stat_per_index
	Statistics on compression, indexed by index->id. More...

uint	page_zip_level = DEFAULT_COMPRESSION_LEVEL
	Default Zip compression level. More...

bool	page_zip_log_pages = true

static bool	page_zip_compress_dbg
	Set this variable in a debugger to enable excessive logging in page_zip_compress(). More...

static unsigned	page_zip_compress_log
	Set this variable in a debugger to enable binary logging of the data passed to deflate(). More...

Detailed Description

Compressed page interface.

Created June 2005 by Marko Makela

Macro Definition Documentation

◆ ASSERT_ZERO

#define ASSERT_ZERO	(	b,
		s
	)

Value:

ut_ad(!memcmp(b, field_ref_zero, \

std::min(static_cast<size_t>(s), sizeof field_ref_zero)));

field_ref_zero

const byte field_ref_zero[FIELD_REF_SIZE]

A BLOB field reference full of zero, for use in assertions and tests.

Definition: page0zip.cc:42

ut_ad

#define ut_ad(EXPR)

Debug assertion.

Definition: ut0dbg.h:69

Assert that a block of memory is filled with zero bytes.

Compare at most sizeof(field_ref_zero) bytes.

Parameters

b	in: memory block
s	in: size of the memory block, in bytes

◆ ASSERT_ZERO_BLOB

#define ASSERT_ZERO_BLOB ( b ) ut_ad(!memcmp(b, field_ref_zero, sizeof field_ref_zero))

Assert that a BLOB pointer is filled with zero bytes.

Parameters

b	in: BLOB pointer

◆ deflate

#define deflate	(	strm,
		flush
	)	page_zip_compress_deflate(logfile, strm, flush)

Debug wrapper for the zlib compression routine deflate().

Log the operation if page_zip_compress_dbg is set.

Parameters

strm	in/out: compressed stream
flush	in: flushing method

Returns: deflate() status: Z_OK, Z_BUF_ERROR, ...

◆ FILE_LOGFILE

#define FILE_LOGFILE FILE *logfile,

Declaration of the logfile parameter.

◆ LOGFILE

#define LOGFILE logfile,

The logfile parameter.

◆ PAGE_ZIP_COMPRESS_DBG

#define PAGE_ZIP_COMPRESS_DBG

Symbol for enabling compression and decompression diagnostics.

Function Documentation

◆ page_zip_clear_rec()

static void page_zip_clear_rec	(	page_zip_des_t *	page_zip,
		byte *	rec,
		const dict_index_t *	index,
		const ulint *	offsets
	)

static

Clear an area on the uncompressed and compressed page.

Do not clear the data payload, as that would grow the modification log.

Parameters

page_zip	in/out: compressed page
rec	in: record to clear
index	in: index of rec
offsets	in: rec_get_offsets(rec, index)

◆ page_zip_compress()

bool page_zip_compress	(	page_zip_des_t *	page_zip,
		const page_t *	page,
		dict_index_t *	index,
		ulint	level,
		mtr_t *	mtr
	)

Compress a page.

Returns: true on success, false on failure; page_zip will be left intact on failure.

< index field information

< compressed payload of the page

< dense page directory, sorted by address

Parameters

page_zip	in: size; out: data, n_blobs, m_start, m_end, m_nonempty
page	in: uncompressed page
index	in: index tree
level	in: compression level
mtr	in/out: mini-transaction, or NULL

◆ page_zip_compress_clust()

static int page_zip_compress_clust	(	FILE_LOGFILE z_stream *	c_stream,
		const rec_t **	recs,
		ulint	n_dense,
		dict_index_t *	index,
		ulint *	n_blobs,
		ulint	trx_id_col,
		byte *	deleted,
		byte *	storage,
		mem_heap_t *	heap
	)

static

Compress the records of a leaf node of a clustered index.

Returns: Z_OK, or a zlib error code

Parameters

c_stream	in/out: compressed page stream
recs	in: dense page directory sorted by address
n_dense	in: size of recs[]
index	in: the index of the page
n_blobs	in: 0; out: number of externally stored columns
trx_id_col	index of the trx_id column
deleted	in: dense directory entry pointing to the head of the free list
storage	in: end of dense page directory
heap	in: temporary memory heap

◆ page_zip_compress_clust_ext()

static int page_zip_compress_clust_ext	(	FILE_LOGFILE z_stream *	c_stream,
		const dict_index_t *	index,
		const rec_t *	rec,
		const ulint *	offsets,
		ulint	trx_id_col,
		byte *	deleted,
		byte *	storage,
		byte **	externs,
		ulint *	n_blobs
	)

static

Compress a record of a leaf node of a clustered index that contains externally stored columns.

Parameters

[in,out]	c_stream	compressed page stream
[in]	index	index
[in]	rec	record
[in]	offsets	rec_get_offsets(rec)
[in]	trx_id_col	position of of DB_TRX_ID
[in]	deleted	dense directory entry pointing to the head of the free list
[in]	storage	pointer to the next available BLOB pointer
[in,out]	externs	pointer to the next available BLOB pointer
[in,out]	n_blobs	number of externally stored columns

Returns: Z_OK, or a zlib error code

◆ page_zip_compress_deflate()

static int page_zip_compress_deflate	(	FILE *	logfile,
		z_streamp	strm,
		int	flush
	)

static

Wrapper for deflate().

Log the operation if page_zip_compress_dbg is set.

Returns: deflate() status: Z_OK, Z_BUF_ERROR, ...

Parameters

logfile	in: log file, or NULL
strm	in/out: compressed stream for deflate()
flush	in: deflate() flushing method

◆ page_zip_compress_node_ptrs()

static int page_zip_compress_node_ptrs	(	FILE_LOGFILE z_stream *	c_stream,
		const rec_t **	recs,
		ulint	n_dense,
		dict_index_t *	index,
		byte *	storage,
		mem_heap_t *	heap
	)

static

Compress the records of a node pointer page.

Returns: Z_OK, or a zlib error code

Parameters

c_stream	in/out: compressed page stream
recs	in: dense page directory sorted by address
n_dense	in: size of recs[]
index	in: the index of the page
storage	in: end of dense page directory
heap	in: temporary memory heap

◆ page_zip_compress_sec()

static int page_zip_compress_sec	(	FILE_LOGFILE z_stream *	c_stream,
		const rec_t **	recs,
		ulint	n_dense
	)

static

Compress the records of a leaf node of a secondary index.

Returns: Z_OK, or a zlib error code

Parameters

c_stream	in/out: compressed page stream
recs	in: dense page directory sorted by address
n_dense	in: size of recs[]

◆ page_zip_compress_write_log()

static void page_zip_compress_write_log	(	const page_zip_des_t *	page_zip,
		const page_t *	page,
		dict_index_t *	index,
		mtr_t *	mtr
	)

static

Write a log record of compressing an index page.

Parameters

page_zip	in: compressed page
page	in: uncompressed page
index	in: index of the B-tree node
mtr	in: mini-transaction

◆ page_zip_copy_recs()

void page_zip_copy_recs	(	page_zip_des_t *	page_zip,
		page_t *	page,
		const page_zip_des_t *	src_zip,
		const page_t *	src,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Copy the records of a page byte for byte.

Do not copy the page header or trailer, except those B-tree header fields that are directly related to the storage of records. Also copy PAGE_MAX_TRX_ID. NOTE: The caller must update the lock table and the adaptive hash index.

Parameters

page_zip	out: copy of src_zip (n_blobs, m_start, m_end, m_nonempty, data[0..size-1])
page	out: copy of src
src_zip	in: compressed page
src	in: page
index	in: index of the B-tree
mtr	in: mini-transaction

◆ page_zip_decompress()

bool page_zip_decompress	(	page_zip_des_t *	page_zip,
		page_t *	page,
		bool	all
	)

Decompress a page.

This function should tolerate errors on the compressed page. Instead of letting assertions fail, it will return false if an inconsistency is detected.

Returns: true on success, false on failure

Parameters

page_zip	in: data, ssize; out: m_start, m_end, m_nonempty, n_blobs
page	out: uncompressed page, may be trashed
all	in: true=decompress the whole page; false=verify but do not copy some page header fields that should not change after page creation

◆ page_zip_dir_add_slot()

void page_zip_dir_add_slot	(	page_zip_des_t *	page_zip,
		bool	is_clustered
	)

Add a slot to the dense page directory.

Parameters

[in,out]	page_zip	Compressed page
[in]	is_clustered	Nonzero for clustered index, zero for others

◆ page_zip_dir_delete()

void page_zip_dir_delete	(	page_zip_des_t *	page_zip,
		byte *	rec,
		const dict_index_t *	index,
		const ulint *	offsets,
		const byte *	free
	)

Shift the dense page directory and the array of BLOB pointers when a record is deleted.

Parameters

[in,out]	page_zip	compressed page
[in]	rec	deleted record
[in]	index	index of rec
[in]	offsets	rec_get_offsets(rec)
[in]	free	previous start of the free list

◆ page_zip_dir_encode()

static void page_zip_dir_encode	(	const page_t *	page,
		byte *	buf,
		const rec_t **	recs
	)

static

Populate the dense page directory from the sparse directory.

Parameters

page	in: compact page
buf	in: pointer to dense page directory[-1]; out: dense directory on compressed page
recs	in: pointer to an array of 0, or NULL; out: dense page directory sorted by ascending address (and heap_no)

◆ page_zip_dir_find()

static byte * page_zip_dir_find	(	page_zip_des_t *	page_zip,
		ulint	offset
	)

inlinestatic

Find the slot of the given non-free record in the dense page directory.

Returns: dense directory slot, or NULL if record not found

Parameters

page_zip	in: compressed page
offset	in: offset of user record

◆ page_zip_dir_insert()

void page_zip_dir_insert	(	page_zip_des_t *	page_zip,
		const byte *	prev_rec,
		const byte *	free_rec,
		byte *	rec
	)

Insert a record to the dense page directory.

Parameters

[in,out]	page_zip	Compressed page
[in]	prev_rec	Record after which to insert
[in]	free_rec	Record from which rec was allocated, or null
[in]	rec	Record to insert

◆ page_zip_empty_size()

ulint page_zip_empty_size	(	ulint	n_fields,
		ulint	zip_size
	)

Determine the guaranteed free space on an empty page.

Returns: minimum payload size on the page

Parameters

n_fields	in: number of columns in the index
zip_size	in: compressed page size in bytes

◆ page_zip_fields_encode()

ulint page_zip_fields_encode	(	ulint	n,
		const dict_index_t *	index,
		ulint	trx_id_pos,
		byte *	buf
	)

Write the index information for the compressed page.

Returns: used size of buf

Parameters

n	in: number of fields to compress
index	in: index comprising at least n fields
trx_id_pos	in: position of the trx_id column in the index, or ULINT_UNDEFINED if this is a non-leaf page
buf	out: buffer of (n + 1) * 2 bytes

◆ page_zip_fixed_field_encode()

static byte * page_zip_fixed_field_encode	(	byte *	buf,
		ulint	val
	)

static

Encode the length of a fixed-length column.

Returns: buf + length of encoded val

Parameters

buf	in: pointer to buffer where to write
val	in: value to write

◆ page_zip_get_n_prev_extern()

static ulint page_zip_get_n_prev_extern	(	const page_zip_des_t *	page_zip,
		const rec_t *	rec,
		const dict_index_t *	index
	)

static

Determine how many externally stored columns are contained in existing records with smaller heap_no than rec.

Parameters

[in]	page_zip	Dense page directory on compressed page
[in]	rec	Compact physical record on a b-tree leaf page
[in]	index	Record descriptor

◆ page_zip_header_cmp()

static void page_zip_header_cmp	(	const page_zip_des_t *	page_zip,
		const byte *	page
	)

static

Assert that the compressed and decompressed page headers match.

Parameters

[in]	page_zip	compressed page
[in]	page	uncompressed page

◆ page_zip_is_too_big()

bool page_zip_is_too_big	(	const dict_index_t *	index,
		const dtuple_t *	entry
	)

Check whether a tuple is too big for compressed table.

Parameters

[in]	index	dict index object
[in]	entry	entry for the index

Returns: true if it's too big, otherwise false

◆ page_zip_parse_compress()

byte * page_zip_parse_compress	(	byte *	ptr,
		byte *	end_ptr,
		page_t *	page,
		page_zip_des_t *	page_zip
	)

Parses a log record of compressing an index page.

Returns: end of log record or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
page	out: uncompressed page
page_zip	out: compressed page

◆ page_zip_parse_write_blob_ptr()

byte * page_zip_parse_write_blob_ptr	(	byte *	ptr,
		byte *	end_ptr,
		page_t *	page,
		page_zip_des_t *	page_zip
	)

Parses a log record of writing a BLOB pointer of a record.

Returns: end of log record or NULL

Parameters

ptr	in: redo log buffer
end_ptr	in: redo log buffer end
page	in/out: uncompressed page
page_zip	in/out: compressed page

◆ page_zip_parse_write_header()

byte * page_zip_parse_write_header	(	byte *	ptr,
		byte *	end_ptr,
		page_t *	page,
		page_zip_des_t *	page_zip
	)

Parses a log record of writing to the header of a page.

Returns: end of log record or NULL

Parameters

ptr	in: redo log buffer
end_ptr	in: redo log buffer end
page	in/out: uncompressed page
page_zip	in/out: compressed page

◆ page_zip_parse_write_node_ptr()

byte * page_zip_parse_write_node_ptr	(	byte *	ptr,
		byte *	end_ptr,
		page_t *	page,
		page_zip_des_t *	page_zip
	)

Parses a log record of writing the node pointer of a record.

Returns: end of log record or NULL

Parameters

ptr	in: redo log buffer
end_ptr	in: redo log buffer end
page	in/out: uncompressed page
page_zip	in/out: compressed page

◆ page_zip_rec_set_deleted()

void page_zip_rec_set_deleted	(	page_zip_des_t *	page_zip,
		const byte *	rec,
		bool	flag
	)

Write the "deleted" flag of a record on a compressed page.

The flag must already have been written on the uncompressed page.

Parameters

page_zip	in/out: compressed page
rec	in: record on the uncompressed page
flag	in: the deleted flag (nonzero=true)

◆ page_zip_rec_set_owned()

void page_zip_rec_set_owned	(	page_zip_des_t *	page_zip,
		const byte *	rec,
		ulint	flag
	)

Write the "owned" flag of a record on a compressed page.

The n_owned field must already have been written on the uncompressed page.

Parameters

[in,out]	page_zip	Compressed page
[in]	rec	Record on the uncompressed page
[in]	flag	The owned flag (nonzero=true)

◆ page_zip_reorganize()

bool page_zip_reorganize	(	buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Reorganize and compress a page.

This is a low-level operation for compressed pages, to be used when page_zip_compress() fails. On success, a redo log entry MLOG_ZIP_PAGE_COMPRESS will be written. The function btr_page_reorganize() should be preferred whenever possible. IMPORTANT: if page_zip_reorganize() is invoked on a leaf page of a non-clustered index, the caller must update the insert buffer free bits in the same mini-transaction in such a way that the modification will be redo-logged.

Returns: true on success, false on failure; page_zip will be left intact on failure, but page will be overwritten.

Parameters

block	in/out: page with compressed page; on the compressed page, in: size; out: data, n_blobs, m_start, m_end, m_nonempty
index	in: index of the B-tree node
mtr	in: mini-transaction

◆ page_zip_write_blob_ptr()

void page_zip_write_blob_ptr	(	page_zip_des_t *	page_zip,
		const byte *	rec,
		const dict_index_t *	index,
		const ulint *	offsets,
		ulint	n,
		mtr_t *	mtr
	)

Write a BLOB pointer of a record on the leaf page of a clustered index.

The information must already have been updated on the uncompressed page.

Parameters

page_zip	in/out: compressed page
rec	in/out: record whose data is being written
index	in: index of the page
offsets	in: rec_get_offsets(rec, index)
n	in: column index
mtr	in: mini-transaction handle, or NULL if no logging is needed

◆ page_zip_write_header_log()

void page_zip_write_header_log	(	const byte *	data,
		ulint	length,
		mtr_t *	mtr
	)

Write a log record of writing to the uncompressed header portion of a page.

in: mini-transaction

Parameters

data	in: data on the uncompressed page
length	in: length of the data
mtr	in: mini-transaction

◆ page_zip_write_node_ptr()

void page_zip_write_node_ptr	(	page_zip_des_t *	page_zip,
		byte *	rec,
		ulint	size,
		ulint	ptr,
		mtr_t *	mtr
	)

Write the node pointer of a record on a non-leaf compressed page.

Parameters

[in,out]	page_zip	Compressed page
[in,out]	rec	Record
[in]	size	Data size of rec
[in]	ptr	Node pointer
[in]	mtr	Mini-transaction, or null

◆ page_zip_write_rec()

void page_zip_write_rec	(	page_zip_des_t *	page_zip,
		const byte *	rec,
		const dict_index_t *	index,
		const ulint *	offsets,
		ulint	create
	)

Write an entire record on the compressed page.

The data must already have been written to the uncompressed page.

Parameters

page_zip	in/out: compressed page
rec	in: record being written
index	in: the index the record belongs to
offsets	in: rec_get_offsets(rec, index)
create	in: nonzero=insert, zero=update

◆ page_zip_write_rec_ext()

static byte * page_zip_write_rec_ext	(	page_zip_des_t *	page_zip,
		const page_t *	page,
		const byte *	rec,
		const dict_index_t *	index,
		const ulint *	offsets,
		ulint	create,
		ulint	trx_id_col,
		ulint	heap_no,
		byte *	storage,
		byte *	data
	)

static

Write a record on the compressed page that contains externally stored columns.

The data must already have been written to the uncompressed page.

Returns: end of modification log

Parameters

page_zip	in/out: compressed page
page	in: page containing rec
rec	in: record being written
index	in: record descriptor
offsets	in: rec_get_offsets(rec, index)
create	in: nonzero=insert, zero=update
trx_id_col	in: position of DB_TRX_ID
heap_no	in: heap number of rec
storage	in: end of dense page directory
data	in: end of modification log

◆ page_zip_write_trx_id_and_roll_ptr()

void page_zip_write_trx_id_and_roll_ptr	(	page_zip_des_t *	page_zip,
		byte *	rec,
		const ulint *	offsets,
		ulint	trx_id_col,
		trx_id_t	trx_id,
		roll_ptr_t	roll_ptr
	)

Write the trx_id and roll_ptr of a record on a B-tree leaf node page.

Parameters

[in,out]	page_zip	Compressed page
[in,out]	rec	Record
[in]	offsets	Rec_get_offsets(rec, index)
[in]	trx_id_col	Column number of trx_id in rec
[in]	trx_id	Transaction identifier
[in]	roll_ptr	Roll_ptr

Variable Documentation

◆ field_ref_zero

const byte field_ref_zero[FIELD_REF_SIZE]

Initial value:

= {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
}

A BLOB field reference full of zero, for use in assertions and tests.

A BLOB field reference full of zero, for use in assertions and tests.Initially, BLOB field references are set to zero, in dtuple_convert_big_rec().

Initially, BLOB field references are set to zero, in dtuple_convert_big_rec().

◆ page_zip_compress_dbg

bool page_zip_compress_dbg

static

Set this variable in a debugger to enable excessive logging in page_zip_compress().

◆ page_zip_compress_log

unsigned page_zip_compress_log

static

Set this variable in a debugger to enable binary logging of the data passed to deflate().

When this variable is nonzero, it will act as a log file name generator.

◆ page_zip_level

uint page_zip_level = DEFAULT_COMPRESSION_LEVEL

Default Zip compression level.

◆ page_zip_log_pages

bool page_zip_log_pages = true

◆ page_zip_stat

page_zip_stat_t page_zip_stat[PAGE_ZIP_SSIZE_MAX]

Statistics on compression, indexed by page_zip_des_t::ssize - 1.

◆ page_zip_stat_per_index

page_zip_stat_per_index_t page_zip_stat_per_index

Statistics on compression, indexed by index->id.

Statistics on compression, indexed by dict_index_t::id.

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ ASSERT_ZERO

◆ ASSERT_ZERO_BLOB

◆ deflate

◆ FILE_LOGFILE

◆ LOGFILE

◆ PAGE_ZIP_COMPRESS_DBG

Function Documentation

◆ page_zip_clear_rec()

◆ page_zip_compress()

◆ page_zip_compress_clust()

◆ page_zip_compress_clust_ext()

◆ page_zip_compress_deflate()

◆ page_zip_compress_node_ptrs()

◆ page_zip_compress_sec()

◆ page_zip_compress_write_log()

◆ page_zip_copy_recs()

◆ page_zip_decompress()

◆ page_zip_dir_add_slot()

◆ page_zip_dir_delete()

◆ page_zip_dir_encode()

◆ page_zip_dir_find()

◆ page_zip_dir_insert()

◆ page_zip_empty_size()

◆ page_zip_fields_encode()

◆ page_zip_fixed_field_encode()

◆ page_zip_get_n_prev_extern()

◆ page_zip_header_cmp()

◆ page_zip_is_too_big()

◆ page_zip_parse_compress()

◆ page_zip_parse_write_blob_ptr()

◆ page_zip_parse_write_header()

◆ page_zip_parse_write_node_ptr()

◆ page_zip_rec_set_deleted()

◆ page_zip_rec_set_owned()

◆ page_zip_reorganize()

◆ page_zip_write_blob_ptr()

◆ page_zip_write_header_log()

◆ page_zip_write_node_ptr()

◆ page_zip_write_rec()

◆ page_zip_write_rec_ext()

◆ page_zip_write_trx_id_and_roll_ptr()

Variable Documentation

◆ field_ref_zero

◆ page_zip_compress_dbg

◆ page_zip_compress_log

◆ page_zip_level

◆ page_zip_log_pages

◆ page_zip_stat

◆ page_zip_stat_per_index