SET GLOBAL INNODB_FILE_PER_TABLE= 0;
Warnings:
Warning	1287	'@@innodb_file_per_table' is deprecated and will be removed in a future release
CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
f3 INT NOT NULL, INDEX(f1),
INDEX(f2), INDEX(f3))ENGINE=InnoDB;
INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
INSERT INTO t1 SELECT seq, seq, seq FROM seq_1_to_16384;
DROP TABLE t1;
InnoDB		0 transactions not purged
SELECT NAME, FILE_SIZE FROM information_schema.innodb_sys_tablespaces WHERE SPACE = 0;
NAME	FILE_SIZE
innodb_system	70254592
# restart
SELECT NAME, FILE_SIZE FROM information_schema.innodb_sys_tablespaces WHERE SPACE = 0;
NAME	FILE_SIZE
innodb_system	3145728
# Incremental backup
# Prepare full backup, apply incremental one
# Restore and check results
# shutdown server
# remove datadir
# xtrabackup move back
# restart
SELECT NAME, FILE_SIZE FROM information_schema.innodb_sys_tablespaces WHERE SPACE = 0;
NAME	FILE_SIZE
innodb_system	3145728