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set @save_use_stat_tables=@@use_stat_tables;
set use_stat_tables='preferably';
DROP DATABASE IF EXISTS dbt3_s001;
CREATE DATABASE dbt3_s001;
use dbt3_s001;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
select * from mysql.table_stats;
db_name table_name cardinality
dbt3_s001 customer 150
dbt3_s001 lineitem 6005
dbt3_s001 nation 25
dbt3_s001 orders 1500
dbt3_s001 part 200
dbt3_s001 partsupp 700
dbt3_s001 region 5
dbt3_s001 supplier 10
select * from mysql.index_stats;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 customer PRIMARY 1 1.0000
dbt3_s001 customer i_c_nationkey 1 6.0000
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_receiptdate 1 2.6477
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 nation PRIMARY 1 1.0000
dbt3_s001 nation i_n_regionkey 1 5.0000
dbt3_s001 orders PRIMARY 1 1.0000
dbt3_s001 orders i_o_orderdate 1 1.3321
dbt3_s001 orders i_o_custkey 1 15.0000
dbt3_s001 part PRIMARY 1 1.0000
dbt3_s001 partsupp PRIMARY 1 3.5000
dbt3_s001 partsupp PRIMARY 2 1.0000
dbt3_s001 partsupp i_ps_partkey 1 3.5000
dbt3_s001 partsupp i_ps_suppkey 1 70.0000
dbt3_s001 region PRIMARY 1 1.0000
dbt3_s001 supplier PRIMARY 1 1.0000
dbt3_s001 supplier i_s_nationkey 1 1.1111
flush table lineitem;
set use_stat_tables='never';
select round(sum(l_extendedprice*l_discount),4) as revenue
from lineitem
where l_shipdate >= date '1994-01-01'
and l_shipdate < date '1994-01-01' + interval '1' year
and l_discount between 0.06 - 0.01 and 0.06 + 0.01
and l_quantity < 24;
revenue
77949.9186
connect con1, localhost, root,,;
connect con2, localhost, root,,;
connection con1;
set debug_sync='statistics_mem_alloc_start1 WAIT_FOR second_thread_started_too';
set debug_sync='statistics_mem_alloc_start2 SIGNAL first_thread_working';
use dbt3_s001;
set use_stat_tables='preferably';
select round(sum(l_extendedprice*l_discount),4) as revenue
from lineitem
where l_shipdate >= date '1994-01-01'
and l_shipdate < date '1994-01-01' + interval '1' year
and l_discount between 0.06 - 0.01 and 0.06 + 0.01
and l_quantity < 24 ;
connection con2;
set debug_sync='statistics_mem_alloc_start1 SIGNAL second_thread_started_too';
set debug_sync='statistics_mem_alloc_start2 WAIT_FOR first_thread_working';
use dbt3_s001;
set use_stat_tables='preferably';
select round(sum(l_extendedprice*l_discount),4) as revenue
from lineitem
where l_shipdate >= date '1994-01-01'
and l_shipdate < date '1994-01-01' + interval '1' year
and l_discount between 0.06 - 0.01 and 0.06 + 0.01
and l_quantity < 24;
connection con1;
revenue
77949.9186
connection con2;
revenue
77949.9186
connection default;
set use_stat_tables='preferably';
disconnect con1;
disconnect con2;
set debug_sync='RESET';
select * from mysql.index_stats where table_name='lineitem' order by index_name;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_receiptdate 1 2.6477
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
delete from mysql.index_stats
where table_name='lineitem' and
index_name in ('i_l_shipdate', 'i_l_receiptdate');
select * from mysql.index_stats where table_name='lineitem' order by index_name;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
analyze table lineitem persistent for columns() indexes (i_l_shipdate);
select * from mysql.index_stats where table_name='lineitem' order by index_name;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
delete from mysql.index_stats
where table_name='lineitem' and index_name= 'i_l_shipdate';
select * from mysql.index_stats where table_name='lineitem' order by index_name;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
connect con1, localhost, root,,;
connect con2, localhost, root,,;
connection con1;
set debug_sync='statistics_collection_start1 WAIT_FOR second_thread_started_too';
set debug_sync='statistics_collection_start2 SIGNAL first_thread_working';
use dbt3_s001;
set use_stat_tables='preferably';
analyze table lineitem persistent for columns() indexes (i_l_shipdate);
connection con2;
set debug_sync='statistics_collection_start1 SIGNAL second_thread_started_too';
set debug_sync='statistics_collection_start2 WAIT_FOR first_thread_working';
use dbt3_s001;
set use_stat_tables='preferably';
analyze table lineitem persistent for columns() indexes (i_l_receiptdate);
connection con1;
connection con2;
connection default;
disconnect con1;
disconnect con2;
set debug_sync='RESET';
select * from mysql.index_stats where table_name='lineitem' order by index_name, prefix_arity;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_receiptdate 1 2.6477
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
select * from mysql.index_stats where table_name='lineitem'
order by index_name, prefix_arity;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_receiptdate 1 2.6477
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
set debug_sync='RESET';
connect con1, localhost, root,,;
connect con2, localhost, root,,;
connection con1;
set debug_sync='statistics_collection_start SIGNAL parked WAIT_FOR finish';
use dbt3_s001;
set use_stat_tables='preferably';
analyze table lineitem persistent for all;
connection con2;
set debug_sync='now WAIT_FOR parked';
use dbt3_s001;
set use_stat_tables='never';
set debug_sync='now SIGNAL finish';
connection con1;
connection default;
disconnect con1;
disconnect con2;
set debug_sync='RESET';
select * from mysql.index_stats where table_name='lineitem'
order by index_name, prefix_arity;
db_name table_name index_name prefix_arity avg_frequency
dbt3_s001 lineitem PRIMARY 1 4.0033
dbt3_s001 lineitem PRIMARY 2 1.0000
dbt3_s001 lineitem i_l_commitdate 1 2.7160
dbt3_s001 lineitem i_l_orderkey 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
dbt3_s001 lineitem i_l_partkey 1 30.0250
dbt3_s001 lineitem i_l_receiptdate 1 2.6477
dbt3_s001 lineitem i_l_shipdate 1 2.6500
dbt3_s001 lineitem i_l_suppkey 1 600.5000
dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
set @save_global_use_stat_tables=@@global.use_stat_tables;
set global use_stat_tables='preferably';
set debug_sync='RESET';
connect con1, localhost, root,,;
connect con2, localhost, root,,;
connection con1;
set debug_sync='statistics_update_start SIGNAL parker WAIT_FOR go1 EXECUTE 1';
set debug_sync='thr_multi_lock_before_thr_lock SIGNAL go2 EXECUTE 3';
use dbt3_s001;
analyze table lineitem persistent for all;
connection con2;
set debug_sync='open_and_process_table WAIT_FOR parker';
set debug_sync='statistics_read_start SIGNAL go1 WAIT_FOR go2';
use dbt3_s001;
select * from mysql.index_stats, lineitem where index_name= 'i_l_shipdate' and l_orderkey=1 and l_partkey=68 order by prefix_arity;;
connection con1;
connection con2;
db_name table_name index_name prefix_arity avg_frequency l_orderkey l_partkey l_suppkey l_linenumber l_quantity l_extendedprice l_discount l_tax l_returnflag l_linestatus l_shipDATE l_commitDATE l_receiptDATE l_shipinstruct l_shipmode l_comment
dbt3_s001 lineitem i_l_shipdate 1 2.6500 1 68 9 2 36 34850.16 0.09 0.06 N O 1996-04-12 1996-02-28 1996-04-20 TAKE BACK RETURN MAIL slyly bold pinto beans detect s
connection default;
disconnect con1;
disconnect con2;
set debug_sync='RESET';
set global use_stat_tables=@save_global_use_stat_tables;
DROP DATABASE dbt3_s001;
use test;
set @save_global_use_stat_tables=@@global.use_stat_tables;
set global use_stat_tables='preferably';
set debug_sync='RESET';
create table t1 (a int, b int, key(a));
insert t1 values (1,1),(2,2);
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
SET debug_sync='after_open_table_ignore_flush WAIT_FOR go';
select * from information_schema.statistics where table_schema='test';
connect con1, localhost, root;
connection con1;
select * from t1;
a b
1 1
2 2
SET DEBUG_SYNC= "now SIGNAL go";
connection default;
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME NON_UNIQUE INDEX_SCHEMA INDEX_NAME SEQ_IN_INDEX COLUMN_NAME COLLATION CARDINALITY SUB_PART PACKED NULLABLE INDEX_TYPE COMMENT INDEX_COMMENT
def test t1 1 test a 1 a A 2 NULL NULL YES BTREE
connection default;
disconnect con1;
set debug_sync='RESET';
drop table t1;
set global use_stat_tables=@save_global_use_stat_tables;
set use_stat_tables=@save_use_stat_tables;
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