#
# immediate scrubbing is off
# background scrubbing is on
#
show variables like 'innodb_%scrub_data%';
Variable_name	Value
innodb_background_scrub_data_check_interval	3600
innodb_background_scrub_data_compressed	ON
innodb_background_scrub_data_interval	604800
innodb_background_scrub_data_uncompressed	ON
innodb_immediate_scrub_data_uncompressed	OFF
# make sure spaces are checked quickly
SET GLOBAL innodb_background_scrub_data_check_interval=1;
create table snapshot_status engine = myisam
select * from information_schema.global_status
where variable_name like 'innodb_scrub%';
truncate table snapshot_status;
insert into snapshot_status
select * from information_schema.global_status
where variable_name like 'innodb_scrub%';
#
# Test delete of records
#
create table t1 (
a int auto_increment primary key,
b varchar(256),
c text, index(b)) engine = innodb row_format=dynamic;
# Populate table with rows
delete from t1;
#
# Test delete+rollback+delete
#
create table t2 (
a int auto_increment primary key,
b varchar(256),
c text, index(b)) engine = innodb row_format=dynamic;
# Populate table with rows
begin;
delete from t2;
rollback;
delete from t2;
#
# Test insert+rollback
#
create table t3 (
a int auto_increment primary key,
b varchar(256),
c text, index(b)) engine = innodb row_format=dynamic;
# Populate table with rows
begin;
rollback;
# start scrubbing threads
SET GLOBAL innodb_encryption_threads=5;
# Wait max 10 min for scrubbing
# Success!
# stop scrubbing threads
SET GLOBAL innodb_encryption_threads=0;
# restart mysqld so that all pages are flushed
# read all rows from table
select * from t1;
# dynamic: delete: grep -c bicycle t1.ibd
0
# dynamic: delete: grep -c repairman t1.ibd
0
# dynamic: delete rollback: grep -c bicycle t2.ibd
0
# dynamic: delete rollback: grep -c repairman t2.ibd
0
# dynamic: insert rollback: grep -c bicycle t3.ibd
0
# dynamic: insert rollback: grep -c repairman t3.ibd
0
drop table t1, t2, t3;
show variables like 'innodb_%scrub_data%';
Variable_name	Value
innodb_background_scrub_data_check_interval	3600
innodb_background_scrub_data_compressed	ON
innodb_background_scrub_data_interval	604800
innodb_background_scrub_data_uncompressed	ON
innodb_immediate_scrub_data_uncompressed	OFF
drop table snapshot_status;