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e581396b7a
Before commit6112853cdain MySQL 4.1.1 introduced the parameter innodb_file_per_table, all InnoDB data was written to the InnoDB system tablespace (often named ibdata1). A serious design problem is that once the system tablespace has grown to some size, it cannot shrink even if the data inside it has been deleted. There are also other design problems, such as the server hang MDEV-29930 that should only be possible when using innodb_file_per_table=0 and innodb_undo_tablespaces=0 (storing both tables and undo logs in the InnoDB system tablespace). The parameter innodb_change_buffering was deprecated in commitb5852ffbee. Starting with commitbaf276e6d4(MDEV-19229) the number of innodb_undo_tablespaces can be increased, so that the undo logs can be moved out of the system tablespace of an existing installation. If all these things (tables, undo logs, and the change buffer) are removed from the InnoDB system tablespace, the only variable-size data structure inside it is the InnoDB data dictionary. DDL operations on .ibd files was optimized in commit86dc7b4d4c(MDEV-24626). That should have removed any thinkable performance advantage of using innodb_file_per_table=0. Since there should be no benefit of setting innodb_file_per_table=0, the parameter should be deprecated. Starting with MySQL 5.6 and MariaDB Server 10.0, the default value is innodb_file_per_table=1.
95 lines
2.8 KiB
Text
95 lines
2.8 KiB
Text
SET @saved_encrypt_tables = @@global.innodb_encrypt_tables;
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SET @saved_encryption_threads = @@global.innodb_encryption_threads;
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SET @saved_encryption_key_id = @@global.innodb_default_encryption_key_id;
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SET GLOBAL innodb_encrypt_tables = ON;
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SET GLOBAL innodb_encryption_threads = 4;
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SET GLOBAL innodb_default_encryption_key_id=4;
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create table tce(a serial, b blob, index(b(10))) engine=innodb
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ROW_FORMAT=COMPRESSED encrypted=yes;
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create table tc(a serial, b blob, index(b(10))) engine=innodb
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ROW_FORMAT=COMPRESSED encrypted=no;
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Warnings:
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Warning 140 InnoDB: ENCRYPTED=NO implies ENCRYPTION_KEY_ID=1
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create table te(a serial, b blob, index(b(10))) engine=innodb
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encrypted=yes;
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create table t(a serial, b blob, index(b(10))) engine=innodb
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encrypted=no;
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Warnings:
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Warning 140 InnoDB: ENCRYPTED=NO implies ENCRYPTION_KEY_ID=1
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create table tpe(a serial, b blob, index(b(10))) engine=innodb
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page_compressed=yes encrypted=yes;
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create table tp(a serial, b blob, index(b(10))) engine=innodb
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page_compressed=yes encrypted=no;
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Warnings:
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Warning 140 InnoDB: ENCRYPTED=NO implies ENCRYPTION_KEY_ID=1
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begin;
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insert into tce(b) values (repeat('secret',20));
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insert into tc(b) values (repeat('secret',20));
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insert into te(b) values (repeat('secret',20));
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insert into t(b) values (repeat('secret',20));
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insert into tpe(b) values (repeat('secret',20));
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insert into tp(b) values (repeat('secret',20));
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commit;
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FLUSH TABLES tce, tc, te, t, tpe, tp FOR EXPORT;
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backup: tce
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backup: tc
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backup: te
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backup: t
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backup: tpe
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backup: tp
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db.opt
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t.cfg
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t.frm
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t.ibd
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tc.cfg
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tc.frm
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tc.ibd
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tce.cfg
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tce.frm
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tce.ibd
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te.cfg
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te.frm
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te.ibd
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tp.cfg
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tp.frm
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tp.ibd
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tpe.cfg
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tpe.frm
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tpe.ibd
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UNLOCK TABLES;
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ALTER TABLE tce DISCARD TABLESPACE;
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ALTER TABLE tc DISCARD TABLESPACE;
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ALTER TABLE te DISCARD TABLESPACE;
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ALTER TABLE t DISCARD TABLESPACE;
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ALTER TABLE tpe DISCARD TABLESPACE;
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ALTER TABLE tp DISCARD TABLESPACE;
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restore: tce .ibd and .cfg files
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restore: tc .ibd and .cfg files
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restore: te .ibd and .cfg files
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restore: t .ibd and .cfg files
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restore: tpe .ibd and .cfg files
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restore: tp .ibd and .cfg files
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ALTER TABLE tce IMPORT TABLESPACE;
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update tce set b=substr(b,1);
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ALTER TABLE tc IMPORT TABLESPACE;
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update tc set b=substr(b,1);
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ALTER TABLE te IMPORT TABLESPACE;
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update te set b=substr(b,1);
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ALTER TABLE t IMPORT TABLESPACE;
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update t set b=substr(b,1);
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ALTER TABLE tpe IMPORT TABLESPACE;
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update tpe set b=substr(b,1);
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ALTER TABLE tp IMPORT TABLESPACE;
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update tp set b=substr(b,1);
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CHECK TABLE tce, tc, te, t, tpe, tp;
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Table Op Msg_type Msg_text
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test.tce check status OK
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test.tc check status OK
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test.te check status OK
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test.t check status OK
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test.tpe check status OK
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test.tp check status OK
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DROP TABLE tce, tc, te, t, tpe, tp;
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SET GLOBAL innodb_encrypt_tables = @saved_encrypt_tables;
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SET GLOBAL innodb_encryption_threads = @saved_encryption_threads;
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SET GLOBAL innodb_default_encryption_key_id = @saved_encryption_key_id;
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