MySQL isolation level transactions

#  Inquire about mysql Version of 
select version();

#  Query the isolation level of the transaction 
select @@tx_isolation;

SELECT @@transaction_isolation;


set session tx_isolation='REPEATABLE-READ';

set session tx_isolation='read-committed';

#  Set the global transaction isolation level  spring The default isolation level is mysql Set the isolation level of （spring The value of is  default  or  -1）
set global transaction_isolation ='read-committed';


show global variables like '%isolation%';


#  Query log path
show VARIABLES like 'log_%';

#  Query transactions 
SELECT * FROM information_schema.INNODB_TRX;

#  Query timeout 
SHOW VARIABLES LIKE 'innodb_lock_wait_timeout';

# Set timeout 
SET innodb_lock_wait_timeout=6;

#  Query the log of the last deadlock 
show engine innodb status

 

A client ：

select version();
select @@autocommit;
set session autocommit = 0;

set session tx_isolation='REPEATABLE-READ';
set session tx_isolation='SERIALIZABLE';

START TRANSACTION;

SELECT * from cloudwalk_auth ;

COMMIT;

select @@tx_isolation;

 

B  client ：

 

select @@autocommit;
set session autocommit = 0;

set session tx_isolation='REPEATABLE-READ';
set session tx_isolation='SERIALIZABLE';

start TRANSACTION;

UPDATE cloudwalk_auth set branch_id=-1;

SELECT * from cloudwalk_auth;
COMMIT;

select @@tx_isolation;