WordPress

-- source include/have_innodb.inc

let $per_table=`select @@innodb_file_per_table`;
let $format=`select @@innodb_file_format`;

-- let $query_i_s = SELECT page_size FROM information_schema.innodb_cmpmem WHERE pages_used > 0

set global innodb_file_per_table=on;
set global innodb_file_format=`1`;
 
create table t1(a text) engine=innodb key_block_size=8;

-- disable_query_log

# insert some rows so we are using compressed pages
-- let $i = 10
while ($i)
{
  insert into t1 values(repeat('abcdefghijklmnopqrstuvwxyz',100));
  dec $i;
}
-- enable_query_log

# we should be using some 8K pages
-- eval $query_i_s

drop table t1;

# because of lazy eviction at drop table in 5.5 there should be some
# used 8K pages
-- eval $query_i_s

# create a non-compressed table and insert enough into it to evict
# compressed pages
create table t2(a text) engine=innodb;

-- disable_query_log

-- let $i = 400
while ($i)
{
  insert into t2 values(repeat('abcdefghijklmnopqrstuvwxyz',1000));
  dec $i;
}

-- enable_query_log

# now there should be no 8K pages in the buffer pool
-- eval $query_i_s

drop table t2;

#
# restore environment to the state it was before this test execution
#

-- disable_query_log
eval set global innodb_file_format=$format;
eval set global innodb_file_per_table=$per_table;