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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.
135 lines
3.9 KiB
Plaintext
135 lines
3.9 KiB
Plaintext
#Want to skip this test from daily Valgrind execution
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--source include/no_valgrind_without_big.inc
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# Embedded server tests do not support restarting.
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--source include/not_embedded.inc
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#
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# Bug #56680 InnoDB may return wrong results from a case-insensitive index
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#
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-- source include/innodb_page_size_small.inc
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-- disable_query_log
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# The flag innodb_change_buffering_debug is only available in debug builds.
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# It instructs InnoDB to try to evict pages from the buffer pool when
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# change buffering is possible, so that the change buffer will be used
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# whenever possible.
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-- error 0,ER_UNKNOWN_SYSTEM_VARIABLE
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SET GLOBAL innodb_change_buffering_debug = 1;
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-- enable_query_log
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SET GLOBAL tx_isolation='REPEATABLE-READ';
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CREATE TABLE bug56680(
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a INT AUTO_INCREMENT PRIMARY KEY,
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b CHAR(1),
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c INT,
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INDEX(b))
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ENGINE=InnoDB STATS_PERSISTENT=0;
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INSERT INTO bug56680 VALUES(0,'x',1);
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BEGIN;
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SELECT b FROM bug56680;
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connect (con1,localhost,root,,);
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connection con1;
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BEGIN;
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UPDATE bug56680 SET b='X';
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connection default;
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# This should return the last committed value 'x', but would return 'X'
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# due to a bug in row_search_for_mysql().
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SELECT b FROM bug56680;
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# This would always return the last committed value 'x'.
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SELECT * FROM bug56680;
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connection con1;
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ROLLBACK;
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disconnect con1;
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connection default;
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SELECT b FROM bug56680;
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# For the rest of this test, use the READ UNCOMMITTED isolation level
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# to see what exists in the secondary index.
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SET GLOBAL tx_isolation='READ-UNCOMMITTED';
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# Create enough rows for the table, so that the insert buffer will be
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# used for modifying the secondary index page. There must be multiple
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# index pages, because changes to the root page are never buffered.
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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BEGIN;
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SELECT b FROM bug56680 LIMIT 2;
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connect (con1,localhost,root,,);
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connection con1;
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BEGIN;
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DELETE FROM bug56680 WHERE a=1;
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# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
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INSERT INTO bug56680 VALUES(1,'X',1);
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# This should force an insert buffer merge, and return 'X' in the first row.
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SELECT b FROM bug56680 LIMIT 3;
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connection default;
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SELECT b FROM bug56680 LIMIT 2;
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CHECK TABLE bug56680;
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connection con1;
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ROLLBACK;
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SELECT b FROM bug56680 LIMIT 2;
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CHECK TABLE bug56680;
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connection default;
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disconnect con1;
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SELECT b FROM bug56680 LIMIT 2;
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CREATE TABLE bug56680_2(
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a INT AUTO_INCREMENT PRIMARY KEY,
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b VARCHAR(2) CHARSET latin1 COLLATE latin1_german2_ci,
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c INT,
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INDEX(b))
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ENGINE=InnoDB STATS_PERSISTENT=0;
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INSERT INTO bug56680_2 SELECT 0,_latin1 0xdf,c FROM bug56680;
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BEGIN;
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SELECT HEX(b) FROM bug56680_2 LIMIT 2;
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DELETE FROM bug56680_2 WHERE a=1;
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# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
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INSERT INTO bug56680_2 VALUES(1,'SS',1);
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# This should force an insert buffer merge, and return 'SS' in the first row.
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SELECT HEX(b) FROM bug56680_2 LIMIT 3;
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CHECK TABLE bug56680_2;
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# Test this with compressed tables.
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ALTER TABLE bug56680_2 ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=1;
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SELECT HEX(b) FROM bug56680_2 LIMIT 2;
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DELETE FROM bug56680_2 WHERE a=1;
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# This should be buffered, if innodb_change_buffering_debug = 1 is in effect.
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INSERT INTO bug56680_2 VALUES(1,_latin1 0xdf,1);
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# This should force an insert buffer merge, and return 0xdf in the first row.
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SELECT HEX(b) FROM bug56680_2 LIMIT 3;
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CHECK TABLE bug56680_2;
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--let $shutdown_timeout=0
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--source include/restart_mysqld.inc
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CHECK TABLE bug56680_2;
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DROP TABLE bug56680_2;
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DROP TABLE bug56680;
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