database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00
Code Activity

dict0mem.c, dict0dict.c, row0mysql.c, dict0mem.h:

Browse Source 
Do less statistics calculations for tables
dict0mem.h, row0mysql.c:
  Make calculation of new statistics less frequent, because the statistics in 3.23.44 involves many random disk reads


innobase/include/dict0mem.h:
  Do less statistics calculations for tables
innobase/row/row0mysql.c:
  Do less statistics calculations for tables
innobase/dict/dict0dict.c:
  Do less statistics calculations for tables
innobase/dict/dict0mem.c:
  Do less statistics calculations for tables
This commit is contained in:
unknown
2001-12-17 13:17:48 +02:00
parent 56a8ad593e
commit b41e57a70e
4 changed files with 52 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
innobase/row/row0mysql.c
View File

@ -432,19 +432,24 @@ row_update_statistics_if_needed(
row_prebuilt_t* prebuilt) /* in: prebuilt struct */
{
ulint counter;
ulint old_counter;
counter = prebuilt->table->stat_modif_counter;
counter = prebuilt->table->stat_modified_counter;
counter += prebuilt->mysql_row_len;
prebuilt->table->stat_modif_counter = counter;
/* Since the physical size of an InnoDB row is bigger than the
MySQL row len, we put a safety factor 2 below */
old_counter = prebuilt->table->stat_last_estimate_counter;
counter += 2 * prebuilt->mysql_row_len;
if (counter - old_counter >= DICT_STAT_CALCULATE_INTERVAL
|| counter - old_counter >=
(UNIV_PAGE_SIZE
* prebuilt->table->stat_clustered_index_size / 2)) {
prebuilt->table->stat_modified_counter = counter;
/* Calculate new statistics if 1 / 16 of table has been modified
since the last time a statistics batch was run, or if
stat_modified_counter > 2 000 000 000 (to avoid wrap-around) */
if (counter > 2000000000
|| ((ib_longlong)counter >
(UNIV_PAGE_SIZE * prebuilt->table->stat_clustered_index_size)
/ 16)) {
dict_update_statistics(prebuilt->table);
}
@ -1019,6 +1024,26 @@ row_create_table_for_mysql(
os_event_set(srv_lock_timeout_thread_event);
}
keywordlen = ut_strlen("innodb_mem_validate");
if (namelen >= keywordlen
&& 0 == ut_memcmp(table->name + namelen - keywordlen,
"innodb_mem_validate", keywordlen)) {
/* We define here a debugging feature intended for
developers */
printf("Validating InnoDB memory:\n"
"to use this feature you must compile InnoDB with\n"
"UNIV_MEM_DEBUG defined in univ.i and the server must be\n"
"quiet because allocation from a mem heap is not protected\n"
"by any semaphore.\n");
ut_a(mem_validate());
printf("Memory validated\n");
}
/* Serialize data dictionary operations with dictionary mutex:
no deadlocks can occur then in these operations */