MySQL 8.4.3
Source Code Documentation
page0zip.h
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28
29/** @file include/page0zip.h
30 Compressed page interface
31
32 Created June 2005 by Marko Makela
33 *******************************************************/
34
35#ifndef page0zip_h
36#define page0zip_h
37
38#include <sys/types.h>
39#include <zlib.h>
40
41#include "buf0buf.h"
42#include "buf0checksum.h"
43#include "buf0types.h"
44#include "data0type.h"
45#include "dict0types.h"
46#include "mach0data.h"
47#include "mem0mem.h"
48#include "mtr0types.h"
49#include "page/zipdecompress.h"
50#include "page0types.h"
51#include "srv0srv.h"
52#include "trx0types.h"
53#include "univ.i"
54#include "ut0crc32.h"
55
56/* Compression level to be used by zlib. Settable by user. */
57extern uint page_zip_level;
58
59/* Default compression level. */
60constexpr uint32_t DEFAULT_COMPRESSION_LEVEL = 6;
61/** Start offset of the area that will be compressed */
62#define PAGE_ZIP_START PAGE_NEW_SUPREMUM_END
63/** Predefine the sum of DIR_SLOT, TRX_ID & ROLL_PTR */
66/** Mask of record offsets */
67constexpr uint32_t PAGE_ZIP_DIR_SLOT_MASK = 0x3fff;
68/** 'owned' flag */
69constexpr uint32_t PAGE_ZIP_DIR_SLOT_OWNED = 0x4000;
70/** 'deleted' flag */
71constexpr uint32_t PAGE_ZIP_DIR_SLOT_DEL = 0x8000;
72
73/* Whether or not to log compressed page images to avoid possible
74compression algorithm changes in zlib. */
75extern bool page_zip_log_pages;
76
77/** Set the size of a compressed page in bytes.
78@param[in,out] page_zip compressed page
79@param[in] size size in bytes */
80static inline void page_zip_set_size(page_zip_des_t *page_zip, ulint size);
81
82#ifndef UNIV_HOTBACKUP
83/** Determine if a record is so big that it needs to be stored externally.
84@param[in] rec_size length of the record in bytes
85@param[in] comp nonzero=compact format
86@param[in] n_fields number of fields in the record; ignored if
87tablespace is not compressed
88@param[in] page_size page size
89@return false if the entire record can be stored locally on the page */
90[[nodiscard]] static inline bool page_zip_rec_needs_ext(
91 ulint rec_size, ulint comp, ulint n_fields, const page_size_t &page_size);
92#endif /* !UNIV_HOTBACKUP */
93
94/** Determine the guaranteed free space on an empty page.
95@param[in] n_fields number of columns in the index
96@param[in] zip_size compressed page size in bytes
97@return minimum payload size on the page */
98ulint page_zip_empty_size(ulint n_fields, ulint zip_size);
99
100#ifndef UNIV_HOTBACKUP
101/** Check whether a tuple is too big for compressed table
102@param[in] index dict index object
103@param[in] entry entry for the index
104@return true if it's too big, otherwise false */
105bool page_zip_is_too_big(const dict_index_t *index, const dtuple_t *entry);
106#endif /* !UNIV_HOTBACKUP */
107
108/** Initialize a compressed page descriptor. */
109static inline void page_zip_des_init(
110 page_zip_des_t *page_zip); /*!< in/out: compressed page
111 descriptor */
112
113/** Configure the zlib allocator to use the given memory heap.
114@param[in,out] stream zlib stream
115@param[in] heap Memory heap to use */
116void page_zip_set_alloc(void *stream, mem_heap_t *heap);
117
118/** Compress a page.
119 @return true on success, false on failure; page_zip will be left
120 intact on failure. */
121bool page_zip_compress(page_zip_des_t *page_zip, /*!< in: size; out: data,
122 n_blobs, m_start, m_end,
123 m_nonempty */
124 const page_t *page, /*!< in: uncompressed page */
125 dict_index_t *index, /*!< in: index tree */
126 ulint level, /*!< in: compression level */
127 mtr_t *mtr); /*!< in/out: mini-transaction,
128 or NULL */
129
130/** Write the index information for the compressed page.
131 @return used size of buf */
133 ulint n, /*!< in: number of fields
134 to compress */
135 const dict_index_t *index, /*!< in: index comprising
136 at least n fields */
137 ulint trx_id_pos,
138 /*!< in: position of the trx_id column
139 in the index, or ULINT_UNDEFINED if
140 this is a non-leaf page */
141 byte *buf); /*!< out: buffer of (n + 1) * 2 bytes */
142
143/** Decompress a page. This function should tolerate errors on the compressed
144 page. Instead of letting assertions fail, it will return false if an
145 inconsistency is detected.
146 @return true on success, false on failure */
148 page_zip_des_t *page_zip, /*!< in: data, ssize;
149 out: m_start, m_end, m_nonempty, n_blobs */
150 page_t *page, /*!< out: uncompressed page, may be trashed */
151 bool all); /*!< in: true=decompress the whole page;
152 false=verify but do not copy some
153 page header fields that should not change
154 after page creation */
155
156#ifdef UNIV_ZIP_DEBUG
157/** Check that the compressed and decompressed pages match.
158 @return true if valid, false if not */
159bool page_zip_validate_low(
160 const page_zip_des_t *page_zip, /*!< in: compressed page */
161 const page_t *page, /*!< in: uncompressed page */
162 const dict_index_t *index, /*!< in: index of the page, if known */
163 bool sloppy); /*!< in: false=strict,
164 true=ignore the MIN_REC_FLAG */
165/** Check that the compressed and decompressed pages match. */
166bool page_zip_validate(
167 const page_zip_des_t *page_zip, /*!< in: compressed page */
168 const page_t *page, /*!< in: uncompressed page */
169 const dict_index_t *index); /*!< in: index of the page, if known */
170#endif /* UNIV_ZIP_DEBUG */
171
172/** Determine how big record can be inserted without re-compressing the page.
173@param[in] page_zip Compressed page.
174@param[in] is_clust True if clustered index.
175@return a positive number indicating the maximum size of a record
176whose insertion is guaranteed to succeed, or zero or negative */
177[[nodiscard]] static inline lint page_zip_max_ins_size(
178 const page_zip_des_t *page_zip, bool is_clust);
179
180/** Determine if enough space is available in the modification log.
181@param[in] page_zip Compressed page.
182@param[in] is_clust True if clustered index.
183@param[in] length Combined size of the record.
184@param[in] create Nonzero=add the record to the heap.
185@return true if page_zip_write_rec() will succeed */
186[[nodiscard]] static inline bool page_zip_available(
187 const page_zip_des_t *page_zip, bool is_clust, ulint length, ulint create);
188
189/** Write data to the uncompressed header portion of a page. The data must
190already have been written to the uncompressed page.
191However, the data portion of the uncompressed page may differ from the
192compressed page when a record is being inserted in page_cur_insert_rec_low().
193@param[in,out] page_zip Compressed page
194@param[in] str Address on the uncompressed page
195@param[in] length Length of the data
196@param[in] mtr Mini-transaction, or NULL */
197static inline void page_zip_write_header(page_zip_des_t *page_zip,
198 const byte *str, ulint length,
199 mtr_t *mtr);
200
201/** Write an entire record on the compressed page. The data must already
202 have been written to the uncompressed page. */
204 page_zip_des_t *page_zip, /*!< in/out: compressed page */
205 const byte *rec, /*!< in: record being written */
206 const dict_index_t *index, /*!< in: the index the record belongs to */
207 const ulint *offsets, /*!< in: rec_get_offsets(rec, index) */
208 ulint create); /*!< in: nonzero=insert, zero=update */
209
210/** Parses a log record of writing a BLOB pointer of a record.
211 @return end of log record or NULL */
213 const byte *ptr, /*!< in: redo log buffer */
214 const byte *end_ptr, /*!< in: redo log buffer end */
215 page_t *page, /*!< in/out: uncompressed page */
216 page_zip_des_t *page_zip); /*!< in/out: compressed page */
217
218/** Write a BLOB pointer of a record on the leaf page of a clustered index.
219 The information must already have been updated on the uncompressed page. */
221 page_zip_des_t *page_zip, /*!< in/out: compressed page */
222 const byte *rec, /*!< in/out: record whose data is being
223 written */
224 const dict_index_t *index, /*!< in: index of the page */
225 const ulint *offsets, /*!< in: rec_get_offsets(rec, index) */
226 ulint n, /*!< in: column index */
227 mtr_t *mtr); /*!< in: mini-transaction handle,
228 or NULL if no logging is needed */
229
230/** Parses a log record of writing the node pointer of a record.
231 @return end of log record or NULL */
233 const byte *ptr, /*!< in: redo log buffer */
234 const byte *end_ptr, /*!< in: redo log buffer end */
235 page_t *page, /*!< in/out: uncompressed page */
236 page_zip_des_t *page_zip); /*!< in/out: compressed page */
237
238/** Write the node pointer of a record on a non-leaf compressed page.
239@param[in,out] page_zip Compressed page
240@param[in,out] rec Record
241@param[in] size Data size of rec
242@param[in] ptr Node pointer
243@param[in] mtr Mini-transaction, or null */
244void page_zip_write_node_ptr(page_zip_des_t *page_zip, byte *rec, ulint size,
245 ulint ptr, mtr_t *mtr);
246
247/** Write the trx_id and roll_ptr of a record on a B-tree leaf node page.
248@param[in,out] page_zip Compressed page
249@param[in,out] rec Record
250@param[in] offsets Rec_get_offsets(rec, index)
251@param[in] trx_id_col Column number of trx_id in rec
252@param[in] trx_id Transaction identifier
253@param[in] roll_ptr Roll_ptr */
254void page_zip_write_trx_id_and_roll_ptr(page_zip_des_t *page_zip, byte *rec,
255 const ulint *offsets, ulint trx_id_col,
256 trx_id_t trx_id, roll_ptr_t roll_ptr);
257
258/** Write the "deleted" flag of a record on a compressed page. The flag must
259 already have been written on the uncompressed page. */
261 page_zip_des_t *page_zip, /*!< in/out: compressed page */
262 const byte *rec, /*!< in: record on the uncompressed page */
263 bool flag); /*!< in: the deleted flag (nonzero=true) */
264
265/** Write the "owned" flag of a record on a compressed page. The n_owned field
266must already have been written on the uncompressed page.
267@param[in,out] page_zip Compressed page
268@param[in] rec Record on the uncompressed page
269@param[in] flag The owned flag (nonzero=true) */
270void page_zip_rec_set_owned(page_zip_des_t *page_zip, const byte *rec,
271 ulint flag);
272
273/** Insert a record to the dense page directory.
274@param[in,out] page_zip Compressed page
275@param[in] prev_rec Record after which to insert
276@param[in] free_rec Record from which rec was allocated, or null
277@param[in] rec Record to insert */
278void page_zip_dir_insert(page_zip_des_t *page_zip, const byte *prev_rec,
279 const byte *free_rec, byte *rec);
280
281/** Shift the dense page directory and the array of BLOB pointers when a record
282is deleted.
283@param[in,out] page_zip compressed page
284@param[in] rec deleted record
285@param[in] index index of rec
286@param[in] offsets rec_get_offsets(rec)
287@param[in] free previous start of the free list */
288void page_zip_dir_delete(page_zip_des_t *page_zip, byte *rec,
289 const dict_index_t *index, const ulint *offsets,
290 const byte *free);
291
292/** Add a slot to the dense page directory.
293@param[in,out] page_zip Compressed page
294@param[in] is_clustered Nonzero for clustered index, zero for others */
295void page_zip_dir_add_slot(page_zip_des_t *page_zip, bool is_clustered);
296
297/** Parses a log record of writing to the header of a page.
298 @return end of log record or NULL */
300 const byte *ptr, /*!< in: redo log buffer */
301 const byte *end_ptr, /*!< in: redo log buffer end */
302 page_t *page, /*!< in/out: uncompressed page */
303 page_zip_des_t *page_zip); /*!< in/out: compressed page */
304
305/** Reorganize and compress a page. This is a low-level operation for
306 compressed pages, to be used when page_zip_compress() fails.
307 On success, a redo log entry MLOG_ZIP_PAGE_COMPRESS will be written.
308 The function btr_page_reorganize() should be preferred whenever possible.
309 IMPORTANT: if page_zip_reorganize() is invoked on a leaf page of a
310 non-clustered index, the caller must update the insert buffer free
311 bits in the same mini-transaction in such a way that the modification
312 will be redo-logged.
313 @return true on success, false on failure; page_zip will be left
314 intact on failure, but page will be overwritten. */
316 buf_block_t *block, /*!< in/out: page with compressed page;
317 on the compressed page, in: size;
318 out: data, n_blobs,
319 m_start, m_end, m_nonempty */
320 dict_index_t *index, /*!< in: index of the B-tree node */
321 mtr_t *mtr); /*!< in: mini-transaction */
322/** Copy the records of a page byte for byte. Do not copy the page header
323 or trailer, except those B-tree header fields that are directly
324 related to the storage of records. Also copy PAGE_MAX_TRX_ID.
325 NOTE: The caller must update the lock table and the adaptive hash index. */
327 page_zip_des_t *page_zip, /*!< out: copy of src_zip
328 (n_blobs, m_start, m_end,
329 m_nonempty, data[0..size-1]) */
330 page_t *page, /*!< out: copy of src */
331 const page_zip_des_t *src_zip, /*!< in: compressed page */
332 const page_t *src, /*!< in: page */
333 dict_index_t *index, /*!< in: index of the B-tree */
334 mtr_t *mtr); /*!< in: mini-transaction */
335#ifndef UNIV_HOTBACKUP
336#endif /* !UNIV_HOTBACKUP */
337
338/** Parses a log record of compressing an index page.
339 @return end of log record or NULL */
340const byte *page_zip_parse_compress(
341 const byte *ptr, /*!< in: buffer */
342 const byte *end_ptr, /*!< in: buffer end */
343 page_t *page, /*!< out: uncompressed page */
344 page_zip_des_t *page_zip); /*!< out: compressed page */
345
346/** Write a log record of compressing an index page without the data on the
347page.
348@param[in] level compression level
349@param[in] page page that is compressed
350@param[in] index index
351@param[in] mtr mtr */
353 const page_t *page,
354 dict_index_t *index,
355 mtr_t *mtr);
356
357/** Parses a log record of compressing an index page without the data.
358@param[in] ptr buffer
359@param[in] end_ptr buffer end
360@param[in] page uncompressed page
361@param[out] page_zip compressed page
362@param[in] index index
363@return end of log record or NULL */
364static inline const byte *page_zip_parse_compress_no_data(
365 const byte *ptr, const byte *end_ptr, page_t *page,
366 page_zip_des_t *page_zip, dict_index_t *index);
367
368#ifndef UNIV_HOTBACKUP
369/** Reset the counters used for filling
370 INFORMATION_SCHEMA.innodb_cmp_per_index. */
371static inline void page_zip_reset_stat_per_index();
372
373#endif /* !UNIV_HOTBACKUP */
374
375#include "page0zip.ic"
376
377#endif /* page0zip_h */
The database buffer pool high-level routines.
Buffer pool checksum functions, also linked from /extra/innochecksum.cc.
The database buffer pool global types for the directory.
Page size descriptor.
Definition: page0size.h:50
int page
Definition: ctype-mb.cc:1234
Data types.
constexpr size_t DATA_ROLL_PTR_LEN
Rollback data pointer type size in bytes.
Definition: data0type.h:191
constexpr size_t DATA_TRX_ID_LEN
Transaction ID type size in bytes.
Definition: data0type.h:185
Data dictionary global types.
static int flag
Definition: hp_test1.cc:40
#define free(A)
Definition: lexyy.cc:915
Utilities for converting data from the database file to the machine format.
The memory management.
Mini-transaction buffer global types.
std::string str(const mysqlrouter::ConfigGenerator::Options::Endpoint &ep)
Definition: config_generator.cc:1081
Definition: buf0block_hint.cc:30
bool length(const dd::Spatial_reference_system *srs, const Geometry *g1, double *length, bool *null) noexcept
Computes the length of linestrings and multilinestrings.
Definition: length.cc:76
size_t size(const char *const c)
Definition: base64.h:46
static mysql_service_status_t create(const char *service_names[], reference_caching_channel *out_channel) noexcept
Definition: component.cc:45
Index page routines.
byte page_t
Type of the index page.
Definition: page0types.h:152
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.
Definition: page0zip.cc:2242
const byte * page_zip_parse_write_node_ptr(const byte *ptr, const byte *end_ptr, page_t *page, page_zip_des_t *page_zip)
Parses a log record of writing the node pointer of a record.
Definition: page0zip.cc:1959
bool page_zip_reorganize(buf_block_t *block, dict_index_t *index, mtr_t *mtr)
Reorganize and compress a page.
Definition: page0zip.cc:2547
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.
Definition: page0zip.cc:2329
static void page_zip_write_header(page_zip_des_t *page_zip, const byte *str, ulint length, mtr_t *mtr)
Write data to the uncompressed header portion of a page.
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.
Definition: page0zip.cc:2093
void page_zip_set_alloc(void *stream, mem_heap_t *heap)
Configure the zlib allocator to use the given memory heap.
Definition: zipdecompress.cc:117
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.
Definition: page0zip.cc:1878
constexpr uint32_t PAGE_ZIP_CLUST_LEAF_SLOT_SIZE
Predefine the sum of DIR_SLOT, TRX_ID & ROLL_PTR.
Definition: page0zip.h:64
static void page_zip_compress_write_log_no_data(ulint level, const page_t *page, dict_index_t *index, mtr_t *mtr)
Write a log record of compressing an index page without the data on the page.
constexpr uint32_t PAGE_ZIP_DIR_SLOT_OWNED
'owned' flag
Definition: page0zip.h:69
static bool page_zip_available(const page_zip_des_t *page_zip, bool is_clust, ulint length, ulint create)
Determine if enough space is available in the modification log.
static bool page_zip_rec_needs_ext(ulint rec_size, ulint comp, ulint n_fields, const page_size_t &page_size)
Determine if a record is so big that it needs to be stored externally.
constexpr uint32_t DEFAULT_COMPRESSION_LEVEL
Definition: page0zip.h:60
static void page_zip_reset_stat_per_index()
Reset the counters used for filling INFORMATION_SCHEMA.innodb_cmp_per_index.
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.
Definition: page0zip.cc:312
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.
Definition: page0zip.cc:2219
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.
Definition: page0zip.cc:2031
const byte * page_zip_parse_write_blob_ptr(const byte *ptr, const byte *end_ptr, page_t *page, page_zip_des_t *page_zip)
Parses a log record of writing a BLOB pointer of a record.
Definition: page0zip.cc:1828
ulint page_zip_empty_size(ulint n_fields, ulint zip_size)
Determine the guaranteed free space on an empty page.
Definition: page0zip.cc:110
const byte * page_zip_parse_write_header(const byte *ptr, const byte *end_ptr, page_t *page, page_zip_des_t *page_zip)
Parses a log record of writing to the header of a page.
Definition: page0zip.cc:2454
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.
Definition: page0zip.cc:2633
static void page_zip_des_init(page_zip_des_t *page_zip)
Initialize a compressed page descriptor.
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.
Definition: page0zip.cc:130
void page_zip_dir_add_slot(page_zip_des_t *page_zip, bool is_clustered)
Add a slot to the dense page directory.
Definition: page0zip.cc:2414
static void page_zip_set_size(page_zip_des_t *page_zip, ulint size)
Set the size of a compressed page in bytes.
static lint page_zip_max_ins_size(const page_zip_des_t *page_zip, bool is_clust)
Determine how big record can be inserted without re-compressing the page.
static const byte * page_zip_parse_compress_no_data(const byte *ptr, const byte *end_ptr, page_t *page, page_zip_des_t *page_zip, dict_index_t *index)
Parses a log record of compressing an index page without the data.
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.
Definition: page0zip.cc:921
constexpr uint32_t PAGE_ZIP_DIR_SLOT_MASK
Mask of record offsets.
Definition: page0zip.h:67
constexpr uint32_t PAGE_ZIP_DIR_SLOT_DEL
'deleted' flag
Definition: page0zip.h:71
bool page_zip_decompress(page_zip_des_t *page_zip, page_t *page, bool all)
Decompress a page.
Definition: page0zip.cc:1266
uint page_zip_level
Definition: page0zip.cc:87
const byte * page_zip_parse_compress(const byte *ptr, const byte *end_ptr, page_t *page, page_zip_des_t *page_zip)
Parses a log record of compressing an index page.
Definition: page0zip.cc:2715
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.
Definition: page0zip.cc:2259
bool page_zip_log_pages
Definition: page0zip.cc:91
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.
Definition: page0zip.cc:1659
Compressed page interface.
The server main program.
Definition: completion_hash.h:35
The buffer control block structure.
Definition: buf0buf.h:1747
Data structure for an index.
Definition: dict0mem.h:1046
Structure for an SQL data tuple of fields (logical record)
Definition: data0data.h:694
The info structure stored at the beginning of a heap block.
Definition: mem0mem.h:302
Mini-transaction handle and buffer.
Definition: mtr0mtr.h:177
Compressed page descriptor.
Definition: page0types.h:201
Transaction system global type definitions.
ib_id_t trx_id_t
Transaction identifier (DB_TRX_ID, DATA_TRX_ID)
Definition: trx0types.h:138
ib_id_t roll_ptr_t
Rollback pointer (DB_ROLL_PTR, DATA_ROLL_PTR)
Definition: trx0types.h:140
Version control for database, common definitions, and include files.
unsigned long int ulint
Definition: univ.i:406
long int lint
Definition: univ.i:407
CRC32 implementation.
int n
Definition: xcom_base.cc:509
static int all(site_def const *s, node_no node)
Definition: xcom_transport.cc:885
Compressed page interface.
constexpr uint32_t PAGE_ZIP_DIR_SLOT_SIZE
Size of an compressed page directory entry.
Definition: zipdecompress.ic:48