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4a1ded61a4
- InnoDB fails to shrink the system tablespace when it contains the leaked undo log pages caused by MDEV-30671. - InnoDB does free the unused segment in system tablespace before shrinking the tablespace. InnoDB fails to free the unused segment if XA PREPARE transaction exist or if the previous shutdown was not with innodb_fast_shutdown=0 inode_info: Structure to store the inode page and offsets. fil_space_t::garbage_collect(): Frees the system tablespace unused segment fsp_get_sys_used_segment(): Iterates through all default file segment and index segment present in system tablespace. trx_sys_t::is_xa_exist(): Returns true if the XA transaction exist in the undo logs fseg_inode_free(): Frees the extents, fragment pages for the given index node and ignores any error similar to trx_purge_free_segment() trx_sys_t::reset_page(): Retain the TRX_SYS_FSEG_HEADER value in trx_sys page while resetting the page.
25 lines
1 KiB
Text
25 lines
1 KiB
Text
# restart: --debug_dbug=d,undo_segment_leak
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SET GLOBAL INNODB_FILE_PER_TABLE=0;
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Warnings:
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Warning 1287 '@@innodb_file_per_table' is deprecated and will be removed in a future release
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CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL)ENGINE=InnoDB;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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INSERT INTO t1 SELECT seq, seq FROM seq_1_to_4096;
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UPDATE t1 SET f1 = f1 + 1 WHERE f1 > 1000;
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UPDATE t1 SET f2 = f2 + 1 WHERE f1 > 1000;
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UPDATE t1 SET f1 = f2 + 1 WHERE f1 > 1000;
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UPDATE t1 SET f2 = f1 + 1 WHERE f1 > 1000;
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DELETE FROM t1;
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DROP TABLE t1;
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set GLOBAL innodb_fast_shutdown=0;
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SELECT NAME, FILE_SIZE FROM information_schema.innodb_sys_tablespaces WHERE SPACE = 0;
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NAME FILE_SIZE
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innodb_system 79691776
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# restart
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SELECT NAME, FILE_SIZE FROM information_schema.innodb_sys_tablespaces WHERE SPACE = 0;
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NAME FILE_SIZE
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innodb_system 12582912
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