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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.
159 lines
6.3 KiB
SQL
159 lines
6.3 KiB
SQL
#
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# Test to cause merge of the pages (at secondary index by deleting)
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# test/tab1 should be created already
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# The definition is intended to be based on
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# "create table tab1 (a bigint primary key, b blob) engine=InnoDB row_format=dynamic;"
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# "create index index1 on tab1(b(750));"
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#
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--source include/have_innodb.inc
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--source include/have_innodb_16k.inc
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# turn on flags
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--disable_query_log
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SET GLOBAL innodb_monitor_enable=index_page_merge_attempts;
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SET GLOBAL innodb_monitor_reset=index_page_merge_attempts;
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SET GLOBAL innodb_monitor_enable=index_page_merge_successful;
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SET GLOBAL innodb_monitor_reset=index_page_merge_successful;
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--enable_query_log
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--echo # check MERGE_THRESHOLD
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select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
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from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
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where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
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INSERT INTO tab1 VALUES (1, concat("01", repeat('a',8190)));
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INSERT INTO tab1 VALUES (2, concat("02", repeat('a',8190)));
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INSERT INTO tab1 VALUES (3, concat("03", repeat('a',8190)));
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INSERT INTO tab1 VALUES (4, concat("04", repeat('a',8190)));
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INSERT INTO tab1 VALUES (5, concat("05", repeat('a',8190)));
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INSERT INTO tab1 VALUES (6, concat("06", repeat('a',8190)));
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INSERT INTO tab1 VALUES (7, concat("07", repeat('a',8190)));
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INSERT INTO tab1 VALUES (8, concat("08", repeat('a',8190)));
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INSERT INTO tab1 VALUES (9, concat("09", repeat('a',8190)));
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INSERT INTO tab1 VALUES (10, concat("10", repeat('a',8190)));
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INSERT INTO tab1 VALUES (22, concat("22", repeat('a',8190)));
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INSERT INTO tab1 VALUES (23, concat("23", repeat('a',8190)));
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INSERT INTO tab1 VALUES (24, concat("24", repeat('a',8190)));
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INSERT INTO tab1 VALUES (25, concat("25", repeat('a',8190)));
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INSERT INTO tab1 VALUES (26, concat("26", repeat('a',8190)));
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INSERT INTO tab1 VALUES (27, concat("27", repeat('a',8190)));
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INSERT INTO tab1 VALUES (28, concat("28", repeat('a',8190)));
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INSERT INTO tab1 VALUES (29, concat("29", repeat('a',8190)));
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INSERT INTO tab1 VALUES (30, concat("30", repeat('a',8190)));
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INSERT INTO tab1 VALUES (31, concat("31", repeat('a',8190)));
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INSERT INTO tab1 VALUES (32, concat("32", repeat('a',8190)));
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INSERT INTO tab1 VALUES (33, concat("33", repeat('a',8190)));
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INSERT INTO tab1 VALUES (11, concat("11", repeat('a',8190)));
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INSERT INTO tab1 VALUES (12, concat("12", repeat('a',8190)));
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INSERT INTO tab1 VALUES (13, concat("13", repeat('a',8190)));
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INSERT INTO tab1 VALUES (14, concat("14", repeat('a',8190)));
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INSERT INTO tab1 VALUES (15, concat("15", repeat('a',8190)));
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INSERT INTO tab1 VALUES (16, concat("16", repeat('a',8190)));
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INSERT INTO tab1 VALUES (17, concat("17", repeat('a',8190)));
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INSERT INTO tab1 VALUES (18, concat("18", repeat('a',8190)));
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INSERT INTO tab1 VALUES (19, concat("19", repeat('a',8190)));
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INSERT INTO tab1 VALUES (20, concat("20", repeat('a',8190)));
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INSERT INTO tab1 VALUES (21, concat("21", repeat('a',8190)));
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INSERT INTO tab1 VALUES (34, concat("34", repeat('a',8190)));
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INSERT INTO tab1 VALUES (35, concat("35", repeat('a',8190)));
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INSERT INTO tab1 VALUES (36, concat("36", repeat('a',8190)));
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INSERT INTO tab1 VALUES (37, concat("37", repeat('a',8190)));
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INSERT INTO tab1 VALUES (38, concat("38", repeat('a',8190)));
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INSERT INTO tab1 VALUES (39, concat("39", repeat('a',8190)));
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INSERT INTO tab1 VALUES (40, concat("40", repeat('a',8190)));
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INSERT INTO tab1 VALUES (41, concat("41", repeat('a',8190)));
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INSERT INTO tab1 VALUES (42, concat("42", repeat('a',8190)));
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# clustered index is still root page only with the 42 records.
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# secondary index is filled 2 leaf pages have been prepared
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# | 1,..,21 | 22,..,42 |
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select PAGE_NUMBER, NUMBER_RECORDS
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from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
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INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
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where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
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and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
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begin;
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delete from tab1 where a = 33;
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delete from tab1 where a = 34;
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delete from tab1 where a = 35;
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delete from tab1 where a = 36;
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delete from tab1 where a = 37;
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delete from tab1 where a = 38;
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delete from tab1 where a = 39;
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delete from tab1 where a = 40;
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delete from tab1 where a = 41;
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delete from tab1 where a = 42;
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delete from tab1 where a = 12;
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delete from tab1 where a = 13;
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delete from tab1 where a = 14;
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delete from tab1 where a = 15;
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delete from tab1 where a = 16;
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delete from tab1 where a = 17;
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delete from tab1 where a = 18;
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delete from tab1 where a = 19;
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delete from tab1 where a = 20;
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delete from tab1 where a = 21;
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commit;
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# wait for purge view progress (records are deleted actually by purge)
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--source include/wait_all_purged.inc
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# secondary index is not merged yet
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# | 1,..,11 | 22,..,32 |
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--echo # check page merge happens (nothing is expected)
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SELECT name,count_reset FROM information_schema.innodb_metrics
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WHERE name like 'index_page_merge_%';
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select PAGE_NUMBER, NUMBER_RECORDS
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from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
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INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
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where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
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and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
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delete from tab1 where a = 32;
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# wait for purge view progress (records are deleted actually by purge)
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--source include/wait_all_purged.inc
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--echo # check page merge happens (MERGE_THRESHOLD=50 causes merge here)
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SELECT name,count_reset FROM information_schema.innodb_metrics
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WHERE name like 'index_page_merge_%';
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delete from tab1 where a = 31;
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# wait for purge view progress (records are deleted actually by purge)
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--source include/wait_all_purged.inc
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--echo # check page merge happens (MERGE_THRESHOLD=45 causes merge here)
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SELECT name,count_reset FROM information_schema.innodb_metrics
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WHERE name like 'index_page_merge_%';
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delete from tab1 where a = 30;
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# wait for purge view progress (records are deleted actually by purge)
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--source include/wait_all_purged.inc
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--echo # check page merge happens (MERGE_THRESHOLD=40 causes merge here)
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SELECT name,count_reset FROM information_schema.innodb_metrics
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WHERE name like 'index_page_merge_%';
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--disable_query_log
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# Reset flags
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SET GLOBAL innodb_monitor_disable=index_page_merge_attempts;
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SET GLOBAL innodb_monitor_disable=index_page_merge_successful;
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--disable_warnings
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set global innodb_monitor_enable = default;
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set global innodb_monitor_disable = default;
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set global innodb_monitor_reset = default;
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set global innodb_monitor_reset_all = default;
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--enable_warnings
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--enable_query_log
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