mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
d33b523271
Fixed BUGS: #3300: "UPDATE statement with no index column in where condition locks all rows" Implement semi-consistent read to reduce lock conflicts at the cost of breaking serializability. ha_innobase::unlock_row(): reset the "did semi consistent read" flag ha_innobase::was_semi_consistent_read(), ha_innobase::try_semi_consistent_read(): new methods row_prebuilt_t, row_create_prebuilt(): add field row_read_type for keeping track of semi-consistent reads row_vers_build_for_semi_consistent_read(), row_sel_build_committed_vers_for_mysql(): new functions row_search_for_mysql(): implement semi-consistent reads #9802: "Foreign key checks disallow alter table". Added test cases. #12456: "Cursor shows incorrect data - DML does not affect, probably caching" This patch implements a high-granularity read view to be used with cursors. In this high-granularity consistent read view modifications done by the creating transaction after the cursor is created or future transactions are not visible. But those modifications that transaction did before the cursor was created are visible. #12701: "Support >4GB buffer pool and log files on 64-bit Windows" Do not call os_file_create_tmpfile() at runtime. Instead, create all tempfiles at startup and guard access to them with mutexes. #13778: "If FOREIGN_KEY_CHECKS=0, one can create inconsistent FOREIGN KEYs". When FOREIGN_KEY_CHECKS=0 we still need to check that datatypes between foreign key references are compatible. #14189: "VARBINARY and BINARY variables: trailing space ignored with InnoDB" innobase_init(): Assert that DATA_MYSQL_BINARY_CHARSET_COLL == my_charset_bin.number. dtype_get_pad_char(): Do not pad VARBINARY or BINARY columns. row_ins_cascade_calc_update_vec(): Refuse ON UPDATE CASCADE when trying to change the length of a VARBINARY column that refers to or is referenced by a BINARY column. BINARY columns are no longer padded on comparison, and thus they cannot be padded on storage either. #14747: "Race condition can cause btr_search_drop_page_hash_index() to crash" Note that buf_block_t::index should be protected by btr_search_latch or an s-latch or x-latch on the index page. btr_search_drop_page_hash_index(): Read block->index while holding btr_search_latch and use the cached value in the loop. Remove some redundant assertions. #15108: "mysqld crashes when innodb_log_file_size is set > 4G" #15308: "Problem of Order with Enum Column in Primary Key" #15550: "mysqld crashes in printing a FOREIGN KEY error in InnoDB" row_ins_foreign_report_add_err(): When printing the parent record, use the index in the parent table rather than the index in the child table. #15653: "Slow inserts to InnoDB if many thousands of .ibd files" Keep track on unflushed modifications to file spaces. When there are tens of thousands of file spaces, flushing all files in fil_flush_file_spaces() would be very slow. fil_flush_file_spaces(): Only flush unflushed file spaces. fil_space_t, fil_system_t: Add a list of unflushed spaces. #15991: "innodb-file-per-table + symlink database + rename = cr" os_file_handle_error(): Map the error codes EXDEV, ENOTDIR, and EISDIR to the new code OS_FILE_PATH_ERROR. Treat this code as OS_FILE_PATH_ERROR. This fixes the crash on RENAME TABLE when the .ibd file is a symbolic link to a different file system. #16157: "InnoDB crashes when main location settings are empty" This patch is from Heikki. #16298: "InnoDB segfaults in INSERTs in upgrade of 4.0 -> 5.0 tables with VARCHAR BINARY" dict_load_columns(): Set the charset-collation code DATA_MYSQL_BINARY_CHARSET_COLL for those binary string columns that lack a charset-collation code, i.e., the tables were created with an older version of MySQL/InnoDB than 4.1.2. #16229: "MySQL/InnoDB uses full explicit table locks in trigger processing" Take a InnoDB table lock only if user has explicitly requested a table lock. Added some additional comments to store_lock() and external_lock(). #16387: "InnoDB crash when dropping a foreign key <table>_ibfk_0" Do not mistake TABLENAME_ibfk_0 for auto-generated id. dict_table_get_highest_foreign_id(): Ignore foreign constraint identifiers starting with the pattern TABLENAME_ibfk_0. #16582: "InnoDB: Error in an adaptive hash index pointer to page" Account for a race condition when dropping the adaptive hash index for a B-tree page. btr_search_drop_page_hash_index(): Retry the operation if a hash index with different parameters was built meanwhile. Add diagnostics for the case that hash node pointers to the page remain. btr_search_info_update_hash(), btr_search_info_update_slow(): Document the parameter "info" as in/out. #16814: "SHOW INNODB STATUS format error in LATEST FOREIGN KEY ERROR section" Add a missing newline to the LAST FOREIGN KEY ERROR section in SHOW INNODB STATUS output. dict_foreign_error_report(): Always print a newline after invoking dict_print_info_on_foreign_key_in_create_format(). #16827: "Better InnoDB error message if ibdata files omitted from my.cnf" #17126: "CHECK TABLE on InnoDB causes a short hang during check of adaptive hash" CHECK TABLE blocking other queries, by releasing the btr_search_latch periodically during the adaptive hash table validation. #17405: "Valgrind: conditional jump or move depends on unititialised values" buf_block_init(): Reset magic_n, buf_fix_count and io_fix to avoid testing uninitialized variables.
144 lines
4.9 KiB
C
144 lines
4.9 KiB
C
/******************************************************
|
|
The database buffer pool LRU replacement algorithm
|
|
|
|
(c) 1995 Innobase Oy
|
|
|
|
Created 11/5/1995 Heikki Tuuri
|
|
*******************************************************/
|
|
|
|
#ifndef buf0lru_h
|
|
#define buf0lru_h
|
|
|
|
#include "univ.i"
|
|
#include "ut0byte.h"
|
|
#include "buf0types.h"
|
|
|
|
/**********************************************************************
|
|
Tries to remove LRU flushed blocks from the end of the LRU list and put them
|
|
to the free list. This is beneficial for the efficiency of the insert buffer
|
|
operation, as flushed pages from non-unique non-clustered indexes are here
|
|
taken out of the buffer pool, and their inserts redirected to the insert
|
|
buffer. Otherwise, the flushed blocks could get modified again before read
|
|
operations need new buffer blocks, and the i/o work done in flushing would be
|
|
wasted. */
|
|
|
|
void
|
|
buf_LRU_try_free_flushed_blocks(void);
|
|
/*==================================*/
|
|
/**********************************************************************
|
|
Returns TRUE if less than 15 % of the buffer pool is available. This can be
|
|
used in heuristics to prevent huge transactions eating up the whole buffer
|
|
pool for their locks. */
|
|
|
|
ibool
|
|
buf_LRU_buf_pool_running_out(void);
|
|
/*==============================*/
|
|
/* out: TRUE if less than 15 % of buffer pool
|
|
left */
|
|
|
|
/*#######################################################################
|
|
These are low-level functions
|
|
#########################################################################*/
|
|
|
|
/* Minimum LRU list length for which the LRU_old pointer is defined */
|
|
|
|
#define BUF_LRU_OLD_MIN_LEN 80
|
|
|
|
#define BUF_LRU_FREE_SEARCH_LEN (5 + 2 * BUF_READ_AHEAD_AREA)
|
|
|
|
/**********************************************************************
|
|
Invalidates all pages belonging to a given tablespace when we are deleting
|
|
the data file(s) of that tablespace. A PROBLEM: if readahead is being started,
|
|
what guarantees that it will not try to read in pages after this operation has
|
|
completed? */
|
|
|
|
void
|
|
buf_LRU_invalidate_tablespace(
|
|
/*==========================*/
|
|
ulint id); /* in: space id */
|
|
/**********************************************************************
|
|
Gets the minimum LRU_position field for the blocks in an initial segment
|
|
(determined by BUF_LRU_INITIAL_RATIO) of the LRU list. The limit is not
|
|
guaranteed to be precise, because the ulint_clock may wrap around. */
|
|
|
|
ulint
|
|
buf_LRU_get_recent_limit(void);
|
|
/*==========================*/
|
|
/* out: the limit; zero if could not determine it */
|
|
/**********************************************************************
|
|
Look for a replaceable block from the end of the LRU list and put it to
|
|
the free list if found. */
|
|
|
|
ibool
|
|
buf_LRU_search_and_free_block(
|
|
/*==========================*/
|
|
/* out: TRUE if freed */
|
|
ulint n_iterations); /* in: how many times this has been called
|
|
repeatedly without result: a high value means
|
|
that we should search farther; if value is
|
|
k < 10, then we only search k/10 * number
|
|
of pages in the buffer pool from the end
|
|
of the LRU list */
|
|
/**********************************************************************
|
|
Returns a free block from the buf_pool. The block is taken off the
|
|
free list. If it is empty, blocks are moved from the end of the
|
|
LRU list to the free list. */
|
|
|
|
buf_block_t*
|
|
buf_LRU_get_free_block(void);
|
|
/*=========================*/
|
|
/* out: the free control block; also if AWE is
|
|
used, it is guaranteed that the block has its
|
|
page mapped to a frame when we return */
|
|
/**********************************************************************
|
|
Puts a block back to the free list. */
|
|
|
|
void
|
|
buf_LRU_block_free_non_file_page(
|
|
/*=============================*/
|
|
buf_block_t* block); /* in: block, must not contain a file page */
|
|
/**********************************************************************
|
|
Adds a block to the LRU list. */
|
|
|
|
void
|
|
buf_LRU_add_block(
|
|
/*==============*/
|
|
buf_block_t* block, /* in: control block */
|
|
ibool old); /* in: TRUE if should be put to the old
|
|
blocks in the LRU list, else put to the
|
|
start; if the LRU list is very short, added to
|
|
the start regardless of this parameter */
|
|
/**********************************************************************
|
|
Moves a block to the start of the LRU list. */
|
|
|
|
void
|
|
buf_LRU_make_block_young(
|
|
/*=====================*/
|
|
buf_block_t* block); /* in: control block */
|
|
/**********************************************************************
|
|
Moves a block to the end of the LRU list. */
|
|
|
|
void
|
|
buf_LRU_make_block_old(
|
|
/*===================*/
|
|
buf_block_t* block); /* in: control block */
|
|
#ifdef UNIV_DEBUG
|
|
/**************************************************************************
|
|
Validates the LRU list. */
|
|
|
|
ibool
|
|
buf_LRU_validate(void);
|
|
/*==================*/
|
|
/**************************************************************************
|
|
Prints the LRU list. */
|
|
|
|
void
|
|
buf_LRU_print(void);
|
|
/*===============*/
|
|
#endif /* UNIV_DEBUG */
|
|
|
|
#ifndef UNIV_NONINL
|
|
#include "buf0lru.ic"
|
|
#endif
|
|
|
|
#endif
|