mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 10:56:12 +01:00
d20a96f9c1
In MariaDB, we have a confusing problem where: * The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically. * The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file. Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only. MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
702 lines
23 KiB
Text
702 lines
23 KiB
Text
#
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# Test how do we handle locking in various cases when
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# we read data from InnoDB tables.
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#
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# In fact by performing this test we check two things:
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# 1) That SQL-layer correctly determine type of thr_lock.c
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# lock to be acquired/passed to InnoDB engine.
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# 2) That InnoDB engine correctly interprets this lock
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# type and takes necessary row locks or does not
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# take them if they are not necessary.
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#
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# This test makes sense only in REPEATABLE-READ mode as
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# in SERIALIZABLE mode all statements that read data take
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# shared lock on them to enforce its semantics.
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select @@session.transaction_isolation;
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@@session.transaction_isolation
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REPEATABLE-READ
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# Prepare playground by creating tables, views,
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# routines and triggers used in tests.
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connect con1, localhost, root,,;
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connection default;
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drop table if exists t0, t1, t2, t3, t4, t5;
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drop view if exists v1, v2;
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drop procedure if exists p1;
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drop procedure if exists p2;
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drop function if exists f1;
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drop function if exists f2;
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drop function if exists f3;
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drop function if exists f4;
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drop function if exists f5;
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drop function if exists f6;
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drop function if exists f7;
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drop function if exists f8;
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drop function if exists f9;
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drop function if exists f10;
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drop function if exists f11;
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drop function if exists f12;
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drop function if exists f13;
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drop function if exists f14;
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drop function if exists f15;
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create table t1 (i int primary key) engine=innodb;
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insert into t1 values (1), (2), (3), (4), (5);
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create table t2 (j int primary key) engine=innodb;
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insert into t2 values (1), (2), (3), (4), (5);
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create table t3 (k int primary key) engine=innodb;
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insert into t3 values (1), (2), (3);
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create table t4 (l int primary key) engine=innodb;
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insert into t4 values (1);
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create table t5 (l int primary key) engine=innodb;
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insert into t5 values (1);
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create view v1 as select i from t1;
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create view v2 as select j from t2 where j in (select i from t1);
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create procedure p1(k int) insert into t2 values (k);
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create function f1() returns int
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begin
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declare j int;
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select i from t1 where i = 1 into j;
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return j;
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end|
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create function f2() returns int
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begin
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declare k int;
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select i from t1 where i = 1 into k;
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insert into t2 values (k + 5);
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return 0;
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end|
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create function f3() returns int
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begin
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return (select i from t1 where i = 3);
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end|
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create function f4() returns int
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begin
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if (select i from t1 where i = 3) then
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return 1;
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else
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return 0;
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end if;
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end|
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create function f5() returns int
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begin
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insert into t2 values ((select i from t1 where i = 1) + 5);
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return 0;
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end|
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create function f6() returns int
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begin
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declare k int;
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select i from v1 where i = 1 into k;
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return k;
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end|
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create function f7() returns int
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begin
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declare k int;
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select j from v2 where j = 1 into k;
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return k;
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end|
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create function f8() returns int
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begin
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declare k int;
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select i from v1 where i = 1 into k;
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insert into t2 values (k+5);
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return k;
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end|
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create function f9() returns int
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begin
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update v2 set j=j+10 where j=1;
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return 1;
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end|
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create function f10() returns int
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begin
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return f1();
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end|
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create function f11() returns int
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begin
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declare k int;
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set k= f1();
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insert into t2 values (k+5);
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return k;
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end|
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create function f12(p int) returns int
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begin
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insert into t2 values (p);
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return p;
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end|
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create function f13(p int) returns int
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begin
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return p;
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end|
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create procedure p2(inout p int)
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begin
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select i from t1 where i = 1 into p;
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end|
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create function f14() returns int
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begin
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declare k int;
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call p2(k);
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insert into t2 values (k+5);
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return k;
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end|
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create function f15() returns int
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begin
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declare k int;
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call p2(k);
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return k;
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end|
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create trigger t4_bi before insert on t4 for each row
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begin
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declare k int;
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select i from t1 where i=1 into k;
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set new.l= k+1;
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end|
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create trigger t4_bu before update on t4 for each row
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begin
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if (select i from t1 where i=1) then
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set new.l= 2;
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end if;
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end|
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create trigger t4_bd before delete on t4 for each row
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begin
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if !(select i from v1 where i=1) then
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signal sqlstate '45000';
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end if;
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end|
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create trigger t5_bi before insert on t5 for each row
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begin
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set new.l= f1()+1;
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end|
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create trigger t5_bu before update on t5 for each row
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begin
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declare j int;
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call p2(j);
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set new.l= j + 1;
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end|
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#
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# Set common variables to be used by scripts called below.
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#
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#
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# 1. Statements that read tables and do not use subqueries.
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#
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#
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# 1.1 Simple SELECT statement.
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#
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# No locks are necessary as this statement won't be written
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# to the binary log and InnoDB supports snapshots.
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connection default;
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Success: 'select * from t1' doesn't take row locks on 't1'.
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#
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# 1.2 Multi-UPDATE statement.
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#
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# Has to take shared locks on rows in the table being read as this
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# statement will be written to the binary log and therefore should
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# be serialized with concurrent statements.
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connection default;
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Success: 'update t2, t1 set j= j - 1 where i = j' takes shared row locks on 't1'.
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#
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# 1.3 Multi-DELETE statement.
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#
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# The above is true for this statement as well.
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connection default;
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Success: 'delete t2 from t1, t2 where i = j' takes shared row locks on 't1'.
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#
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# 1.4 DESCRIBE statement.
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#
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# This statement does not really read data from the
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# target table and thus does not take any lock on it.
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# We check this for completeness of coverage.
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connection default;
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Success: 'describe t1' doesn't take row locks on 't1'.
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#
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# 1.5 SHOW statements.
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#
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# The above is true for SHOW statements as well.
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connection default;
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Success: 'show create table t1' doesn't take row locks on 't1'.
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connection default;
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Success: 'show keys from t1' doesn't take row locks on 't1'.
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#
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# 2. Statements which read tables through subqueries.
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#
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#
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# 2.1 CALL with a subquery.
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#
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# A strong lock is not necessary as this statement is not
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# written to the binary log as a whole (it is written
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# statement-by-statement) and thanks to MVCC we can always get
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# versions of rows prior to the update that has locked them.
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# But in practice InnoDB does locking reads for all statements
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# other than SELECT (unless READ UNCOMMITTED or READ COMMITTED).
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connection default;
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Success: 'call p1((select i + 5 from t1 where i = 1))' takes shared row locks on 't1'.
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#
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# 2.2 CREATE TABLE with a subquery.
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#
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# Has to take shared locks on rows in the table being read as
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# this statement is written to the binary log and therefore
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# should be serialized with concurrent statements.
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connection default;
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Success: 'create table t0 engine=innodb select * from t1' takes shared row locks on 't1'.
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drop table t0;
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connection default;
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Success: 'create table t0 engine=innodb select j from t2 where j in (select i from t1)' takes shared row locks on 't1'.
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drop table t0;
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#
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# 2.3 DELETE with a subquery.
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#
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# The above is true for this statement as well.
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connection default;
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Success: 'delete from t2 where j in (select i from t1)' takes shared row locks on 't1'.
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#
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# 2.4 MULTI-DELETE with a subquery.
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#
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# Same is true for this statement as well.
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connection default;
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Success: 'delete t2 from t3, t2 where k = j and j in (select i from t1)' takes shared row locks on 't1'.
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#
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# 2.5 DO with a subquery.
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#
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# In theory should not take row locks as it is not logged.
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# In practice InnoDB takes shared row locks.
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connection default;
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Success: 'do (select i from t1 where i = 1)' takes shared row locks on 't1'.
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#
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# 2.6 INSERT with a subquery.
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#
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# Has to take shared locks on rows in the table being read as
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# this statement is written to the binary log and therefore
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# should be serialized with concurrent statements.
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connection default;
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Success: 'insert into t2 select i+5 from t1' takes shared row locks on 't1'.
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connection default;
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Success: 'insert into t2 values ((select i+5 from t1 where i = 4))' takes shared row locks on 't1'.
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#
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# 2.7 LOAD DATA with a subquery.
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#
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# The above is true for this statement as well.
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connection default;
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Success: 'load data infile '../../std_data/rpl_loaddata.dat' into table t2 (@a, @b) set j= @b + (select i from t1 where i = 1)' takes shared row locks on 't1'.
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#
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# 2.8 REPLACE with a subquery.
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#
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# Same is true for this statement as well.
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connection default;
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Success: 'replace into t2 select i+5 from t1' takes shared row locks on 't1'.
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connection default;
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Success: 'replace into t2 values ((select i+5 from t1 where i = 4))' takes shared row locks on 't1'.
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#
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# 2.9 SELECT with a subquery.
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#
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# Locks are not necessary as this statement is not written
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# to the binary log and thanks to MVCC we can always get
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# versions of rows prior to the update that has locked them.
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#
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# Also serves as a test case for bug #46947 "Embedded SELECT
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# without FOR UPDATE is causing a lock".
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connection default;
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Success: 'select * from t2 where j in (select i from t1)' doesn't take row locks on 't1'.
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#
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# 2.10 SET with a subquery.
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#
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# In theory should not require locking as it is not written
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# to the binary log. In practice InnoDB acquires shared row
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# locks.
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connection default;
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Success: 'set @a:= (select i from t1 where i = 1)' takes shared row locks on 't1'.
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#
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# 2.11 SHOW with a subquery.
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#
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# Similarly to the previous case, in theory should not require locking
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# as it is not written to the binary log. In practice InnoDB
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# acquires shared row locks.
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connection default;
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Success: 'show tables from test where Tables_in_test = 't2' and (select i from t1 where i = 1)' takes shared row locks on 't1'.
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connection default;
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Success: 'show columns from t2 where (select i from t1 where i = 1)' takes shared row locks on 't1'.
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#
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# 2.12 UPDATE with a subquery.
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#
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# Has to take shared locks on rows in the table being read as
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# this statement is written to the binary log and therefore
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# should be serialized with concurrent statements.
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connection default;
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Success: 'update t2 set j= j-10 where j in (select i from t1)' takes shared row locks on 't1'.
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#
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# 2.13 MULTI-UPDATE with a subquery.
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#
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# Same is true for this statement as well.
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connection default;
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Success: 'update t2, t3 set j= j -10 where j=k and j in (select i from t1)' takes shared row locks on 't1'.
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#
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# 3. Statements which read tables through a view.
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#
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#
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# 3.1 SELECT statement which uses some table through a view.
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#
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# Since this statement is not written to the binary log
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# and old version of rows are accessible thanks to MVCC,
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# no locking is necessary.
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connection default;
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Success: 'select * from v1' doesn't take row locks on 't1'.
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connection default;
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Success: 'select * from v2' doesn't take row locks on 't1'.
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connection default;
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Success: 'select * from t2 where j in (select i from v1)' doesn't take row locks on 't1'.
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connection default;
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Success: 'select * from t3 where k in (select j from v2)' doesn't take row locks on 't1'.
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#
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# 3.2 Statements which modify a table and use views.
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#
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# Since such statements are going to be written to the binary
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# log they need to be serialized against concurrent statements
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# and therefore should take shared row locks on data read.
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connection default;
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Success: 'update t2 set j= j-10 where j in (select i from v1)' takes shared row locks on 't1'.
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connection default;
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Success: 'update t3 set k= k-10 where k in (select j from v2)' takes shared row locks on 't1'.
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connection default;
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Success: 'update t2, v1 set j= j-10 where j = i' takes shared row locks on 't1'.
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connection default;
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Success: 'update v2 set j= j-10 where j = 3' takes shared row locks on 't1'.
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#
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# 4. Statements which read tables through stored functions.
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#
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#
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# 4.1 SELECT/SET with a stored function which does not
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# modify data and uses SELECT in its turn.
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#
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# There is no need to take row locks on the table
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# being selected from in SF as the call to such function
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# won't get into the binary log.
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#
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# However in practice innodb takes strong lock on tables
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# being selected from within SF, when SF is called from
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# non SELECT statements like 'set' statement below.
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connection default;
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Success: 'select f1()' doesn't take row locks on 't1'.
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connection default;
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Success: 'set @a:= f1()' takes shared row locks on 't1'.
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#
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# 4.2 INSERT (or other statement which modifies data) with
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# a stored function which does not modify data and uses
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# SELECT.
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#
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# Since such statement is written to the binary log it should
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# be serialized with concurrent statements affecting the data
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# it uses. Therefore it should take row locks on the data
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# it reads.
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connection default;
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Success: 'insert into t2 values (f1() + 5)' takes shared row locks on 't1'.
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#
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# 4.3 SELECT/SET with a stored function which
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# reads and modifies data.
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#
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# Since a call to such function is written to the binary log,
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# it should be serialized with concurrent statements affecting
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# the data it uses. Hence, row locks on the data read
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# should be taken.
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connection default;
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Success: 'select f2()' takes shared row locks on 't1'.
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connection default;
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Success: 'set @a:= f2()' takes shared row locks on 't1'.
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#
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# 4.4. SELECT/SET with a stored function which does not
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# modify data and reads a table through subselect
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# in a control construct.
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#
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# Call to this function won't get to the
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# binary log and thus no locking is needed.
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#
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# However in practice innodb takes strong lock on tables
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# being selected from within SF, when SF is called from
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# non SELECT statements like 'set' statement below.
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connection default;
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Success: 'select f3()' doesn't take row locks on 't1'.
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connection default;
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Success: 'set @a:= f3()' takes shared row locks on 't1'.
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connection default;
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Success: 'select f4()' doesn't take row locks on 't1'.
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connection default;
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Success: 'set @a:= f4()' takes shared row locks on 't1'.
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#
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# 4.5. INSERT (or other statement which modifies data) with
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# a stored function which does not modify data and reads
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# the table through a subselect in one of its control
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# constructs.
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#
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# Since such statement is written to the binary log it should
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# be serialized with concurrent statements affecting data it
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# uses. Therefore it should take row locks on the data
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# it reads.
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connection default;
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Success: 'insert into t2 values (f3() + 5)' takes shared row locks on 't1'.
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connection default;
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Success: 'insert into t2 values (f4() + 6)' takes shared row locks on 't1'.
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#
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# 4.6 SELECT/SET which uses a stored function with
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# DML which reads a table via a subquery.
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#
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# Since call to such function is written to the binary log
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# it should be serialized with concurrent statements.
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# Hence reads should take row locks.
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connection default;
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Success: 'select f5()' takes shared row locks on 't1'.
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connection default;
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Success: 'set @a:= f5()' takes shared row locks on 't1'.
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#
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# 4.7 SELECT/SET which uses a stored function which
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# doesn't modify data and reads tables through
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# a view.
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#
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# Calls to such functions won't get into
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# the binary log and thus don't need row locks.
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#
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# However in practice innodb takes strong lock on tables
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# being selected from within SF, when SF is called from
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# non SELECT statements like 'set' statement below.
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connection default;
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Success: 'select f6()' doesn't take row locks on 't1'.
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connection default;
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Success: 'set @a:= f6()' takes shared row locks on 't1'.
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connection default;
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Success: 'select f7()' doesn't take row locks on 't1'.
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connection default;
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Success: 'set @a:= f7()' takes shared row locks on 't1'.
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#
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# 4.8 INSERT which uses stored function which
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# doesn't modify data and reads a table
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# through a view.
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#
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# Since such statement is written to the binary log and
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# should be serialized with concurrent statements affecting
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# the data it uses. Therefore it should take row locks on
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# the rows it reads.
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connection default;
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Success: 'insert into t3 values (f6() + 5)' takes shared row locks on 't1'.
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connection default;
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Success: 'insert into t3 values (f7() + 5)' takes shared row locks on 't1'.
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#
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# 4.9 SELECT which uses a stored function which
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# modifies data and reads tables through a view.
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#
|
|
# Since a call to such function is written to the binary log
|
|
# it should be serialized with concurrent statements.
|
|
# Hence, reads should take row locks.
|
|
connection default;
|
|
Success: 'select f8()' takes shared row locks on 't1'.
|
|
connection default;
|
|
Success: 'select f9()' takes shared row locks on 't1'.
|
|
#
|
|
# 4.10 SELECT which uses stored function which doesn't modify
|
|
# data and reads a table indirectly, by calling another
|
|
# function.
|
|
#
|
|
# Calls to such functions won't get into the binary
|
|
# log and thus don't need to acquire row locks.
|
|
connection default;
|
|
Success: 'select f10()' doesn't take row locks on 't1'.
|
|
#
|
|
# 4.11 INSERT which uses a stored function which doesn't modify
|
|
# data and reads a table indirectly, by calling another
|
|
# function.
|
|
#
|
|
# Since such statement is written to the binary log, it should
|
|
# be serialized with concurrent statements affecting the data it
|
|
# uses. Therefore it should take row locks on data it reads.
|
|
connection default;
|
|
Success: 'insert into t2 values (f10() + 5)' takes shared row locks on 't1'.
|
|
#
|
|
# 4.12 SELECT which uses a stored function which modifies
|
|
# data and reads a table indirectly, by calling another
|
|
# function.
|
|
#
|
|
# Since a call to such function is written to the binary log
|
|
# it should be serialized from concurrent statements.
|
|
# Hence, reads should take row locks.
|
|
connection default;
|
|
Success: 'select f11()' takes shared row locks on 't1'.
|
|
#
|
|
# 4.13 SELECT that reads a table through a subquery passed
|
|
# as a parameter to a stored function which modifies
|
|
# data.
|
|
#
|
|
# Even though a call to this function is written to the
|
|
# binary log, values of its parameters are written as literals.
|
|
# So there is no need to acquire row locks on rows used in
|
|
# the subquery.
|
|
connection default;
|
|
Success: 'select f12((select i+10 from t1 where i=1))' doesn't take row locks on 't1'.
|
|
#
|
|
# 4.14 INSERT that reads a table via a subquery passed
|
|
# as a parameter to a stored function which doesn't
|
|
# modify data.
|
|
#
|
|
# Since this statement is written to the binary log it should
|
|
# be serialized with concurrent statements affecting the data it
|
|
# uses. Therefore it should take row locks on the data it reads.
|
|
connection default;
|
|
Success: 'insert into t2 values (f13((select i+10 from t1 where i=1)))' takes shared row locks on 't1'.
|
|
#
|
|
# 5. Statements that read tables through stored procedures.
|
|
#
|
|
#
|
|
# 5.1 CALL statement which reads a table via SELECT.
|
|
#
|
|
# Since neither this statement nor its components are
|
|
# written to the binary log, there is no need to take
|
|
# row locks on the data it reads.
|
|
connection default;
|
|
Success: 'call p2(@a)' doesn't take row locks on 't1'.
|
|
#
|
|
# 5.2 Function that modifies data and uses CALL,
|
|
# which reads a table through SELECT.
|
|
#
|
|
# Since a call to such function is written to the binary
|
|
# log, it should be serialized with concurrent statements.
|
|
# Hence, in this case reads should take row locks on data.
|
|
connection default;
|
|
Success: 'select f14()' takes shared row locks on 't1'.
|
|
#
|
|
# 5.3 SELECT that calls a function that doesn't modify data and
|
|
# uses a CALL statement that reads a table via SELECT.
|
|
#
|
|
# Calls to such functions won't get into the binary
|
|
# log and thus don't need to acquire row locks.
|
|
connection default;
|
|
Success: 'select f15()' doesn't take row locks on 't1'.
|
|
#
|
|
# 5.4 INSERT which calls function which doesn't modify data and
|
|
# uses CALL statement which reads table through SELECT.
|
|
#
|
|
# Since such statement is written to the binary log it should
|
|
# be serialized with concurrent statements affecting data it
|
|
# uses. Therefore it should take row locks on data it reads.
|
|
connection default;
|
|
Success: 'insert into t2 values (f15()+5)' takes shared row locks on 't1'.
|
|
#
|
|
# 6. Statements that use triggers.
|
|
#
|
|
#
|
|
# 6.1 Statement invoking a trigger that reads table via SELECT.
|
|
#
|
|
# Since this statement is written to the binary log it should
|
|
# be serialized with concurrent statements affecting the data
|
|
# it uses. Therefore, it should take row locks on the data
|
|
# it reads.
|
|
connection default;
|
|
Success: 'insert into t4 values (2)' takes shared row locks on 't1'.
|
|
#
|
|
# 6.2 Statement invoking a trigger that reads table through
|
|
# a subquery in a control construct.
|
|
#
|
|
# The above is true for this statement as well.
|
|
connection default;
|
|
Success: 'update t4 set l= 2 where l = 1' takes shared row locks on 't1'.
|
|
#
|
|
# 6.3 Statement invoking a trigger that reads a table through
|
|
# a view.
|
|
#
|
|
# And for this statement.
|
|
connection default;
|
|
Success: 'delete from t4 where l = 1' takes shared row locks on 't1'.
|
|
#
|
|
# 6.4 Statement invoking a trigger that reads a table through
|
|
# a stored function.
|
|
#
|
|
# And for this statement.
|
|
connection default;
|
|
Success: 'insert into t5 values (2)' takes shared row locks on 't1'.
|
|
#
|
|
# 6.5 Statement invoking a trigger that reads a table through
|
|
# stored procedure.
|
|
#
|
|
# And for this statement.
|
|
connection default;
|
|
Success: 'update t5 set l= 2 where l = 1' takes shared row locks on 't1'.
|
|
# Clean-up.
|
|
drop function f1;
|
|
drop function f2;
|
|
drop function f3;
|
|
drop function f4;
|
|
drop function f5;
|
|
drop function f6;
|
|
drop function f7;
|
|
drop function f8;
|
|
drop function f9;
|
|
drop function f10;
|
|
drop function f11;
|
|
drop function f12;
|
|
drop function f13;
|
|
drop function f14;
|
|
drop function f15;
|
|
drop view v1, v2;
|
|
drop procedure p1;
|
|
drop procedure p2;
|
|
drop table t1, t2, t3, t4, t5;
|
|
disconnect con1;
|
|
#
|
|
# Test for bug#51263 "Deadlock between transactional SELECT
|
|
# and ALTER TABLE ... REBUILD PARTITION".
|
|
#
|
|
connect con1,localhost,root,,test,,;
|
|
connection default;
|
|
drop table if exists t1, t2;
|
|
create table t1 (i int auto_increment not null primary key) engine=innodb;
|
|
create table t2 (i int) engine=innodb;
|
|
insert into t1 values (1), (2), (3), (4), (5);
|
|
begin;
|
|
# Acquire SR metadata lock on t1 and LOCK_S row-locks on its rows.
|
|
insert into t2 select count(*) from t1;
|
|
connection con1;
|
|
# Sending:
|
|
alter table t1 add column j int;
|
|
connection default;
|
|
# Wait until ALTER is blocked because it tries to upgrade SNW
|
|
# metadata lock to X lock.
|
|
# It should not be blocked during copying data to new version of
|
|
# table as it acquires LOCK_S locks on rows of old version, which
|
|
# are compatible with locks acquired by connection 'con1'.
|
|
# The below statement will deadlock because it will try to acquire
|
|
# SW lock on t1, which will conflict with ALTER's SNW lock. And
|
|
# ALTER will be waiting for this connection to release its SR lock.
|
|
# This deadlock should be detected by an MDL subsystem and this
|
|
# statement should be aborted with an appropriate error.
|
|
insert into t1 values (6);
|
|
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
connection con1;
|
|
# Reaping ALTER TABLE.
|
|
connection default;
|
|
#
|
|
# Now test for scenario in which bug was reported originally.
|
|
#
|
|
drop tables t1, t2;
|
|
create table t1 (i int auto_increment not null primary key) engine=innodb
|
|
partition by hash (i) partitions 4;
|
|
create table t2 (i int) engine=innodb;
|
|
insert into t1 values (1), (2), (3), (4), (5);
|
|
begin;
|
|
# Acquire SR metadata lock on t1.
|
|
select * from t1;
|
|
i
|
|
1
|
|
2
|
|
3
|
|
4
|
|
5
|
|
connection con1;
|
|
# Sending:
|
|
alter table t1 rebuild partition p0;
|
|
connection default;
|
|
# Wait until ALTER is blocked because of active SR lock.
|
|
# The below statement should succeed as transaction
|
|
# has SR metadata lock on t1 and only going to read
|
|
# rows from it.
|
|
insert into t2 select count(*) from t1;
|
|
# Unblock ALTER TABLE.
|
|
commit;
|
|
connection con1;
|
|
# Reaping ALTER TABLE.
|
|
connection default;
|
|
disconnect con1;
|
|
# Clean-up.
|
|
drop tables t1, t2;
|