MYSQL general tablespace

--从mysql 5.7.6 开始其支持 general tablespace，其可以创建在一个相对路径或绝对路径上
--A general tablespace is a shared tablespace, similar to the system tablespace. It can hold multiple tables,
--and supports all table row formats. General tablespaces can also be created in a location relative to or independent of the MySQL data directory


--创建表空间是必需指定数据文件名（只支持一个数据文件），且以 .db 为后缀
--the data file name must have a .ibd extension. An InnoDB general tablespace only supports a single data file

--创建表空间
CREATE TABLESPACE test_ts ADD DATAFILE '/tmp/testts.ibd' ENGINE=INNODB;

--FILE_BLOCK_SIZE只在存储压缩表时才必需，注意压缩表和非压缩表不能在同一个表空间中
--The FILE_BLOCK_SIZE setting is only required if you will use the tablespace to store compressed InnoDB tables (ROW_FORMAT=COMPRESSED).
--If FILE_BLOCK_SIZE is equal innodb_page_size, the tablespace can only contain tables with an uncompressed row format (COMPACT, REDUNDANT, and DYNAMIC row formats). 
--Tables with a COMPRESSED row format have a different physical page size than uncompressed tables.
--Therefore, compressed tables cannot coexist in the same tablespace as uncompressed tables

--没有指定 FILE_BLOCK_SIZE，不能存储压缩表
mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY) TABLESPACE test_ts ROW_FORMAT=COMPRESSED;
ERROR 1478 (HY000): InnoDB: Tablespace `test_ts` cannot contain a COMPRESSED table


--修改表空间属性
mysql> drop tablespace test_ts;
Query OK, 0 rows affected (0.04 sec)

mysql> CREATE TABLESPACE test_ts ADD DATAFILE '/tmp/testts.ibd' FILE_BLOCK_SIZE=8192 ENGINE=INNODB;
Query OK, 0 rows affected (0.14 sec)

mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY) TABLESPACE test_ts ROW_FORMAT=COMPRESSED;
Query OK, 0 rows affected (0.71 sec)


--当表空间中有表存在时，必需先清空表，才能删除表空间
--Use DROP TABLESPACE to remove a general tablespace. All tables must be dropped from a general tablespace using DROP TABLE prior to dropping the tablespace
mysql> drop tablespace test_ts;
ERROR 1529 (HY000): Failed to drop TABLESPACE test_ts
mysql> drop table t1;
Query OK, 0 rows affected (0.25 sec)

mysql> drop tablespace test_ts;
Query OK, 0 rows affected (0.01 sec)


--Tables with a COMPRESSED row format have a different physical page size than uncompressed tables.
mysql> CREATE TABLE t2 (c1 INT PRIMARY KEY) TABLESPACE test_ts ROW_FORMAT=DYNAMIC;
ERROR 1478 (HY000): InnoDB: Tablespace `test_ts` uses block size 8192 and cannot contain a table with physical page size 16384

--If FILE_BLOCK_SIZE is equal innodb_page_size, the tablespace can only contain tables with an uncompressed row format (COMPACT, REDUNDANT, and DYNAMIC row formats)
mysql> CREATE TABLESPACE test_ts ADD DATAFILE '/tmp/testts.ibd' FILE_BLOCK_SIZE=16384 ENGINE=INNODB;
Query OK, 0 rows affected (0.09 sec)

mysql> show variables like '%page_size%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| innodb_page_size | 16384 |
| large_page_size  | 0     |
+------------------+-------+

mysql> CREATE TABLE t2 (c1 INT PRIMARY KEY) TABLESPACE test_ts ROW_FORMAT=DYNAMIC;
Query OK, 0 rows affected (0.07 sec)

mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY) TABLESPACE test_ts ROW_FORMAT=compressed;
ERROR 1478 (HY000): InnoDB: Tablespace `test_ts` cannot contain a COMPRESSED table