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#
# BUG#30869674 - OPTIMIZE TABLE ON MYISAM CAN INCREASE TABLE SIZE (~2X) AND REDUCE PERFORMANCE
#
DROP DATABASE IF EXISTS test_bug30869674;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
CREATE DATABASE test_bug30869674;
USE test_bug30869674;
CREATE TABLE t1(id int, name varchar(255), description varchar(255), count int, primary key(id)) ENGINE=myisam;
INSERT INTO t1 VALUES (1, "test1", "description1", 1), (2, "test2", "description2", 2), (3, "test3", "description3", 3);
FLUSH TABLES;
SELECT * FROM test_bug30869674.t1;
id name description count
1 test1 description1 1
2 test2 description2 2
3 test3 description3 3
UPDATE t1 SET name="testing test2" WHERE id=2;
FLUSH TABLES;
Checking MyISAM file: MYSQLD_DATADIR/test_bug30869674/t1
Data records: 3 Deleted blocks: 0
- check file-size
- check record delete-chain
- check key delete-chain
- check index reference
- check data record references index: 1
Key: 1: Keyblocks used: 3% Packed: 0% Max levels: 1
Total: Keyblocks used: 3% Packed: 0%
- check records and index references
Records: 3 M.recordlength: 31 Packed: 98%
Recordspace used: 98% Empty space: 1% Blocks/Record: 1.33
Record blocks: 4 Delete blocks: 0
Record data: 95 Deleted data: 0
Lost space: 2 Linkdata: 23
OPTIMIZE TABLE t1;
Table Op Msg_type Msg_text
test_bug30869674.t1 optimize status OK
Checking MyISAM file: MYSQLD_DATADIR/test_bug30869674/t1
Data records: 3 Deleted blocks: 0
- check file-size
- check record delete-chain
- check key delete-chain
- check index reference
- check data record references index: 1
Key: 1: Keyblocks used: 3% Packed: 0% Max levels: 1
Total: Keyblocks used: 3% Packed: 0%
- check records and index references
Records: 3 M.recordlength: 31 Packed: 98%
Recordspace used: 100% Empty space: 0% Blocks/Record: 1.00
Record blocks: 3 Delete blocks: 0
Record data: 95 Deleted data: 0
Lost space: 0 Linkdata: 9
SELECT * FROM test_bug30869674.t1;
id name description count
1 test1 description1 1
2 testing test2 description2 2
3 test3 description3 3
DROP DATABASE test_bug30869674;
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