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While the primary purpose of innodb_force_recovery is to allow data to be rescued from an InnoDB instance that would crash due to some data corruption, the settings 1, 2, or 3 are relatively safe to use and there is no need to prevent write transactions in these modes. The setting innodb_force_recovery=4 and above can cause database corruption. For those modes, we already set the flag high_level_read_only to disable modifications, except DROP TABLE. MODIFICATIONS_NOT_ALLOWED_MSG_FORCE_RECOVERY: Remove. There is no need to spam the error log for each refused DML operation. It suffices to return an error to the client. There will be messages at startup if innodb_read_only or innodb_force_recovery are preventing writes.
121 lines
4.3 KiB
Text
121 lines
4.3 KiB
Text
create table t1(f1 int not null, f2 int not null, index idx(f2))engine=innodb;
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create table t2(f1 int primary key, f2 int, index idx(f2))engine=innodb;
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insert into t1 values(1, 2);
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insert into t2 values(1, 2);
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SET GLOBAL innodb_fast_shutdown = 0;
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# Restart the server with innodb_force_recovery as 4.
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select * from t1;
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f1 f2
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1 2
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insert into t1 values(2, 3);
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ERROR HY000: Running in read-only mode
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alter table t1 add f3 int not null, algorithm=copy;
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ERROR HY000: Can't create table `test`.`#sql-temporary` (errno: 165 "Table is read only")
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alter table t1 add f3 int not null, algorithm=inplace;
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ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Operation not allowed when innodb_forced_recovery > 0.. Try ALGORITHM=COPY
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drop index idx on t1;
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ERROR HY000: Can't create table `test`.`#sql-temporary` (errno: 165 "Table is read only")
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alter table t1 drop index idx, algorithm=inplace;
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ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Operation not allowed when innodb_forced_recovery > 0.. Try ALGORITHM=COPY
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update t1 set f1=3 where f2=2;
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ERROR HY000: Running in read-only mode
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create table t3(f1 int not null)engine=innodb;
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ERROR HY000: Can't create table `test`.`t3` (errno: 165 "Table is read only")
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drop table t3;
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ERROR 42S02: Unknown table 'test.t3'
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rename table t1 to t3;
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ERROR HY000: Error on rename of './test/t1' to './test/t3' (errno: 165 "Table is read only")
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truncate table t1;
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ERROR HY000: Table 't1' is read only
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drop table t1;
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show tables;
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Tables_in_test
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t2
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# Restart the server with innodb_force_recovery as 5.
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select * from t2;
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f1 f2
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1 2
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insert into t2 values(2, 3);
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ERROR HY000: Running in read-only mode
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alter table t2 add f3 int not null, algorithm=copy;
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ERROR HY000: Can't create table `test`.`#sql-temporary` (errno: 165 "Table is read only")
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alter table t2 add f3 int not null, algorithm=inplace;
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ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Operation not allowed when innodb_forced_recovery > 0.. Try ALGORITHM=COPY
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drop index idx on t2;
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ERROR HY000: Can't create table `test`.`#sql-temporary` (errno: 165 "Table is read only")
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update t2 set f1=3 where f2=2;
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ERROR HY000: Running in read-only mode
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create table t1(f1 int not null)engine=innodb;
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ERROR HY000: Can't create table `test`.`t1` (errno: 165 "Table is read only")
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drop table t1;
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ERROR 42S02: Unknown table 'test.t1'
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rename table t2 to t3;
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ERROR HY000: Error on rename of './test/t2' to './test/t3' (errno: 165 "Table is read only")
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truncate table t2;
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ERROR HY000: Table 't2' is read only
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drop table t2;
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ERROR HY000: Table 't2' is read only
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show tables;
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Tables_in_test
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t2
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# Restart the server with innodb_force_recovery as 6.
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select * from t2;
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f1 f2
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1 2
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insert into t2 values(2, 3);
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ERROR HY000: Table 't2' is read only
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alter table t2 add f3 int not null, algorithm=copy;
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ERROR HY000: Table 't2' is read only
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alter table t2 add f3 int not null, algorithm=inplace;
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ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Operation not allowed when innodb_forced_recovery > 0.. Try ALGORITHM=COPY
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drop index idx on t2;
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ERROR HY000: Table 't2' is read only
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update t2 set f1=3 where f2=2;
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ERROR HY000: Table 't2' is read only
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create table t1(f1 int not null)engine=innodb;
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ERROR HY000: Can't create table `test`.`t1` (errno: 165 "Table is read only")
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drop table t1;
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ERROR 42S02: Unknown table 'test.t1'
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rename table t2 to t3;
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ERROR HY000: Error on rename of './test/t2' to './test/t3' (errno: 165 "Table is read only")
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truncate table t2;
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ERROR HY000: Table 't2' is read only
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drop table t2;
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ERROR HY000: Table 't2' is read only
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show tables;
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Tables_in_test
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t2
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# Restart the server with innodb_force_recovery=2
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select * from t2;
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f1 f2
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1 2
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begin;
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update t2 set f2=3;
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connect con1,localhost,root,,;
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create table t3(a int)engine=innodb;
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# Force a redo log flush of the above uncommitted UPDATE
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SET GLOBAL innodb_flush_log_at_trx_commit=1;
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drop table t3;
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disconnect con1;
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connection default;
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# Kill the server
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# Restart the server with innodb_force_recovery=3
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SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
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select * from t2;
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f1 f2
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1 3
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SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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select * from t2;
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f1 f2
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1 2
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SET GLOBAL innodb_lock_wait_timeout=1;
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insert into t2 values(1,2);
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ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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insert into t2 values(9,10);
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select * from t2;
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f1 f2
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1 2
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9 10
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drop table t2;
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show tables;
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Tables_in_test
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