mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-04-16 21:35:35 +02:00
Code Issues Projects Releases Packages Wiki Activity

Fix remaining typos

Browse source
This commit is contained in:
Vasilii Lakhin 2025-04-21 18:27:56 +03:00 • committed by Daniel Black
commit 40c5b62531
135 changed files with 217 additions and 217 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Docs/optimizer_costs.txt
View file

@ -179,7 +179,7 @@ MariaDB [test]> select sum(1) from seq_1_to_100000000;
1 row in set (5.162 sec)
Time of where= (8.564-5.162)/100000000 = 3.402/100000000 (100,000,000)
(Result good enough, as sligthly different computations)
(Result is good enough for slightly different computations)
check_costs.pl comes provides the numbers when using heap tables and 1M rows:
@ -217,7 +217,7 @@ cost= scan_time() * optimizer_cache_cost * SCAN_LOOKUP_COST +
We are ignoring TABLE_SCAN_SETUP (which is just to prefer index lookup on small
tables).
We can also ignore records * WHERE_COMPARE_COST as we don't have that
in the above calcuated 'ms'.
in the above calculated 'ms'.
row_costs= (ROW_COPY_COST + ROW_LOOKUP_COST)
cost= scan_time() * 1 * 1 +
@ -430,7 +430,7 @@ blocks= index_size/IO_SIZE =
->
1000000 * 19 / 0.75/ 4096 = 6184
engine_blocks (block_size 8192) = 6184/2 = 3092
(Range optimzer had calculated 3085)
(Range optimizer had calculated 3085)
keyread_time= blocks * avg_io_cost() * cache + engine_blocks * INDEX_BLOCK_COPY_COST + rows * (KEY_NEXT_FIND_COST + KEY_COPY_COST);
= engine_blocks * INDEX_BLOCK_COPY_COST + rows * KEY_NEXT_FIND_COST=
@ -1258,7 +1258,7 @@ MySQL cost structures
MySQL 8.0 server cost are stored in the class Server_cost_constants defined
int opt_costconstants.h
It containts the following slots and has the following default values:
It contains the following slots and has the following default values:
m_row_evaluate_cost 0.1 Cost for evaluating the query condition on
a row