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MySQL 8.4.2
Source Code Documentation
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MySQL 8.4.2
Source Code Documentation
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Code used for background table and index stats gathering. More...
#include "univ.i"#include "dict0types.h"#include "os0event.h"#include "os0thread.h"#include "row0mysql.h"#include "dict0stats_bg.ic"Go to the source code of this file.
Functions | |
| void | dict_stats_recalc_pool_add (const dict_table_t *table) |
| Add a table to the recalc pool, which is processed by the background stats gathering thread. More... | |
| void | dict_stats_recalc_pool_del (const dict_table_t *table) |
| Delete a given table from the auto recalc pool. More... | |
| static void | DICT_STATS_BG_YIELD (trx_t *trx, ut::Location location) |
| Yield the data dictionary latch when waiting for the background thread to stop accessing a table. More... | |
| static bool | dict_stats_stop_bg (dict_table_t *table) |
| Request the background collection of statistics to stop for a table. More... | |
| void | dict_stats_wait_bg_to_stop_using_table (dict_table_t *table, trx_t *trx) |
| Wait until background stats thread has stopped using the specified table. More... | |
| void | dict_stats_thread_init () |
| Initialize global variables needed for the operation of dict_stats_thread(). More... | |
| void | dict_stats_thread_deinit () |
| Free resources allocated by dict_stats_thread_init(), must be called after dict_stats_thread() has exited. More... | |
| void | dict_stats_disabled_debug_update (THD *thd, SYS_VAR *var, void *var_ptr, const void *save) |
| Disables dict stats thread. More... | |
| void | dict_stats_thread () |
| This is the thread for background stats gathering. More... | |
| void | dict_stats_shutdown () |
| Shutdown the dict stats thread. More... | |
Variables | |
| os_event_t | dict_stats_event |
| Event to wake up the stats thread. More... | |
| mysql_pfs_key_t | dict_stats_recalc_pool_mutex_key |
| bool | innodb_dict_stats_disabled_debug |
| Value of MySQL global used to disable dict_stats thread. More... | |
Code used for background table and index stats gathering.
Created Apr 26, 2012 Vasil Dimov
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inlinestatic |
Yield the data dictionary latch when waiting for the background thread to stop accessing a table.
| [in] | trx | transaction holding the data dictionary locks |
| [in] | location | location where called |
| void dict_stats_disabled_debug_update | ( | THD * | thd, |
| SYS_VAR * | var, | ||
| void * | var_ptr, | ||
| const void * | save | ||
| ) |
Disables dict stats thread.
It's used by: SET GLOBAL innodb_dict_stats_disabled_debug = 1 (0).
| [in] | thd | thread handle |
| [in] | var | pointer to system variable |
| [out] | var_ptr | where the formal string goes |
| [in] | save | immediate result from check function |
| void dict_stats_recalc_pool_add | ( | const dict_table_t * | table | ) |
Add a table to the recalc pool, which is processed by the background stats gathering thread.
Only the table id is added to the list, so the table can be closed after being enqueued and it will be opened when needed. If the table does not exist later (has been DROPped), then it will be removed from the pool and skipped. in: table to add
Only the table id is added to the list, so the table can be closed after being enqueued and it will be opened when needed. If the table does not exist later (has been DROPped), then it will be removed from the pool and skipped.
| table | in: table to add |
| void dict_stats_recalc_pool_del | ( | const dict_table_t * | table | ) |
Delete a given table from the auto recalc pool.
dict_stats_recalc_pool_del() in: table to remove
dict_stats_recalc_pool_del()
| table | in: table to remove |
| void dict_stats_shutdown | ( | ) |
Shutdown the dict stats thread.
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inlinestatic |
Request the background collection of statistics to stop for a table.
| true | when no background process is active |
| false | when it is not safe to modify the table definition in/out: table |
| void dict_stats_thread | ( | ) |
This is the thread for background stats gathering.
It pops tables, from the auto recalc list and proceeds them, eventually recalculating their statistics.
| void dict_stats_thread_deinit | ( | ) |
Free resources allocated by dict_stats_thread_init(), must be called after dict_stats_thread() has exited.
| void dict_stats_thread_init | ( | ) |
Initialize global variables needed for the operation of dict_stats_thread().
Must be called before dict_stats_thread() is started.
Initialize global variables needed for the operation of dict_stats_thread().
| void dict_stats_wait_bg_to_stop_using_table | ( | dict_table_t * | table, |
| trx_t * | trx | ||
| ) |
Wait until background stats thread has stopped using the specified table.
The caller must have locked the data dictionary using row_mysql_lock_data_dictionary() and this function may unlock it temporarily and restore the lock before it exits. The background stats thread is guaranteed not to start using the specified table after this function returns and before the caller unlocks the data dictionary because it sets the BG_STAT_IN_PROGRESS bit in table->stats_bg_flag under dict_sys->mutex. in/out: transaction to use for unlocking/locking the data dict
The caller must have locked the data dictionary using row_mysql_lock_data_dictionary() and this function may unlock it temporarily and restore the lock before it exits. The background stats thread is guaranteed not to start using the specified table after this function returns and before the caller unlocks the data dictionary because it sets the BG_STAT_IN_PROGRESS bit in table->stats_bg_flag under dict_sys->mutex.
| table | in/out: table |
| trx | in/out: transaction to use for unlocking/locking the data dict |
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extern |
Event to wake up the stats thread.
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extern |
Value of MySQL global used to disable dict_stats thread.
Value of MySQL global used to disable dict_stats thread.
1.9.2