Quelle information_schema_stats.result
Sprache: Lisp
set @save_userstat=@@global.userstat; set global userstat=1;
create table just_a_test(id int,first_name varchar(10),last_name varchar(10),address varchar(100),phone bigint,email varchar(30), state varchar(30));
insert into just_a_test values(1,'fa','la','china_a',11111111,'fa_la@163.com','California'),
(2,'fb','lb','china_b',22222222,'fb_lb@163.com','Arizona'),
(3,'fc','lc','china_c',33333333,'fc_lc@163.com','California'),
(4,'fd','ld','china_d',44444444,'fd_ld@163.com','Utah'),
(5,'fe','le','china_e',55555555,'fe_le@163.com','Arizona');
alter table just_a_test add primary key (id);
alter table just_a_test add key IND_just_a_test_first_name_last_name(first_name,last_name);
alter table just_a_test add key IND_just_a_test_state(state);
select count(*) from just_a_test where first_name='fc'and last_name='lc';
count(*) 1
select count(*) from just_a_test where state = 'California';
count(*) 2
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
test just_a_test IND_just_a_test_first_name_last_name 11
test just_a_test IND_just_a_test_state 21
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
test just_a_test 18555002000
alter table just_a_test drop key IND_just_a_test_first_name_last_name;
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
test just_a_test IND_just_a_test_state 21
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
test just_a_test 23555002000
alter table just_a_test drop column state;
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
select * from just_a_test force index(primary) where id between 1and2;
id first_name last_name address phone email 1 fa la china_a 11111111 fa_la@163.com 2 fb lb china_b 22222222 fb_lb@163.com
select * from just_a_test force index(primary) where id=8;
id first_name last_name address phone email
update just_a_test set first_name="unlucky" where id=5;
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
test just_a_test 31665104100
delete from just_a_test where id=5;
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
test just_a_test 32775115100
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
test just_a_test PRIMARY 43
drop table just_a_test;
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
create table just_a_test(id int not null primary key,first_name varchar(10),last_name varchar(10),address varchar(100),phone bigint,email varchar(30), state varchar(30),key(first_name,last_name),key(state));
insert into just_a_test values(1,'fa','la','china_a',11111111,'fa_la@163.com','California'),
(2,'fb','lb','china_b',22222222,'fb_lb@163.com','Arizona'),
(3,'fc','lc','china_c',33333333,'fc_lc@163.com','California'),
(4,'fd','ld','china_d',44444444,'fd_ld@163.com','Utah'),
(5,'fe','le','china_e',55555555,'fe_le@163.com','Arizona');
select count(*) from just_a_test where first_name='fc'and last_name='lc';
count(*) 1
select count(*) from just_a_test where state = 'California';
count(*) 2
select count(*) from just_a_test where id between 2and4;
count(*) 3
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
test just_a_test PRIMARY 41
test just_a_test first_name 11
test just_a_test state 21
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK
test just_a_test 75155003000
drop table just_a_test;
select * from information_schema.index_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME INDEX_NAME ROWS_READ QUERIES
select * from information_schema.table_statistics where table_schema='test'and table_name='just_a_test';
TABLE_SCHEMA TABLE_NAME ROWS_READ ROWS_CHANGED ROWS_CHANGED_X_INDEXES ROWS_INSERTED ROWS_UPDATED ROWS_DELETED KEY_READ_HITS KEY_READ_MISSES PAGES_ACCESSED PAGES_READ_FROM_DISK set global userstat=@save_userstat;
# End of 11.5 tests
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-10-08)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.