2
# Test of the MyISAM key cache
5
drop table if exists t1, t2, t3;
8
SET @save_myisam_key_cache_size=@@myisam_key_cache_size;
9
SET @save_myisam_key_cache_block_size=@@myisam_key_cache_block_size;
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SET @save_myisam_key_cache_division_limit=@@myisam_key_cache_division_limit;
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SET @save_myisam_key_cache_age_threshold=@@myisam_key_cache_age_threshold;
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# Show default variables for MyISAM key cache
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SELECT @@myisam_key_cache_size;
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SELECT @@myisam_key_cache_block_size;
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SELECT @@myisam_key_cache_division_limit;
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SELECT @@myisam_key_cache_age_threshold;
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# Change default key cache size
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SET @@global.myisam_key_cache_size=16*1024*1024;
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# Drop Key Cache (warning generated)
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SET @@global.myisam_key_cache_size=0;
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SET @@global.myisam_key_cache_size=0;
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# Change default key cache size
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SET @@global.myisam_key_cache_size=16*1024*1024;
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# Print key buffer with different syntaxes
31
SHOW VARIABLES like "myisam_key_cache_size";
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SELECT @@myisam_key_cache_size;
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SELECT @@global.myisam_key_cache_size;
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SELECT @@global.myisam_key_cache_size;
35
SELECT @@global.`myisam_key_cache_size`;
36
SELECT @@global.`myisam_key_cache_size`;
37
SELECT @@myisam_key_cache_size;
39
SET @@global.myisam_key_cache_size=@save_myisam_key_cache_size;
45
SELECT @@myisam_key_cache_size;
47
SELECT @@skr.storage_engine="test";
50
select @@keycache1.myisam_key_cache_block_size;
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show status like 'key_blocks_used';
55
# Test to set up a too small size for a key cache (bug #2064)
56
set global myisam_key_cache_size=100;
59
# Bug #19079: corrupted index when myisam_key_cache_block_size is not multiple of
62
CREATE temporary TABLE t1(a int NOT NULL AUTO_INCREMENT PRIMARY KEY) ENGINE=MYISAM;
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SET GLOBAL myisam_key_cache_block_size=1536;
64
INSERT INTO t1 VALUES (1);
65
SELECT @@myisam_key_cache_block_size;
69
CREATE TEMPORARY TABLE t1(a int NOT NULL AUTO_INCREMENT PRIMARY KEY, b int) ENGINE=MYISAM;
70
CREATE TEMPORARY TABLE t2(a int NOT NULL AUTO_INCREMENT PRIMARY KEY, b int) ENGINE=MYISAM;
71
SET GLOBAL myisam_key_cache_block_size=1536;
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INSERT INTO t1 VALUES (1,0);
73
INSERT INTO t2(b) SELECT b FROM t1;
74
INSERT INTO t1(b) SELECT b FROM t2;
75
INSERT INTO t2(b) SELECT b FROM t1;
76
INSERT INTO t1(b) SELECT b FROM t2;
77
INSERT INTO t2(b) SELECT b FROM t1;
78
INSERT INTO t1(b) SELECT b FROM t2;
79
INSERT INTO t2(b) SELECT b FROM t1;
80
INSERT INTO t1(b) SELECT b FROM t2;
81
INSERT INTO t2(b) SELECT b FROM t1;
82
INSERT INTO t1(b) SELECT b FROM t2;
83
INSERT INTO t2(b) SELECT b FROM t1;
84
INSERT INTO t1(b) SELECT b FROM t2;
85
INSERT INTO t2(b) SELECT b FROM t1;
86
INSERT INTO t1(b) SELECT b FROM t2;
87
INSERT INTO t2(b) SELECT b FROM t1;
88
INSERT INTO t1(b) SELECT b FROM t2;
89
INSERT INTO t2(b) SELECT b FROM t1;
90
INSERT INTO t1(b) SELECT b FROM t2;
91
SELECT COUNT(*) FROM t1;
92
SELECT @@myisam_key_cache_block_size;
95
# Restore changed variables
96
set global myisam_key_cache_block_size= @save_myisam_key_cache_block_size;
99
# Bug#28478 - Improper myisam_key_cache_block_size corrupts MyISAM tables
101
SET GLOBAL myisam_key_cache_block_size= 1536;
102
CREATE TEMPORARY TABLE t1 (
103
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
109
INSERT INTO t1 (c1, c2, c3) VALUES
110
('a', 'b', 'c'), ('b', 'c', 'd'), ('c', 'd', 'e'), ('d', 'e', 'f'),
111
('e', 'f', 'g'), ('f', 'g', 'h'), ('g', 'h', 'i'), ('h', 'i', 'j'),
112
('i', 'j', 'k'), ('j', 'k', 'l'), ('k', 'l', 'm'), ('l', 'm', 'n'),
113
('m', 'n', 'o'), ('n', 'o', 'p'), ('o', 'p', 'q'), ('p', 'q', 'r'),
114
('q', 'r', 's'), ('r', 's', 't'), ('s', 't', 'u'), ('t', 'u', 'v'),
115
('u', 'v', 'w'), ('v', 'w', 'x'), ('w', 'x', 'y'), ('x', 'y', 'z');
116
CREATE TABLE t2 AS SELECT * FROM t1;
117
INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t2;
118
INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t2;
119
INSERT INTO t1 (c1, c2, c3) SELECT c1, c2, c3 from t2;
121
SHOW VARIABLES LIKE 'myisam_key_cache_block_size';
122
SET GLOBAL myisam_key_cache_block_size= @save_myisam_key_cache_block_size;
125
# Check division limit and age threshold
127
# Division Limit: Minimum 1, maximum 100
128
SET GLOBAL myisam_key_cache_division_limit= 0;
130
SELECT @@myisam_key_cache_division_limit;
132
SET GLOBAL myisam_key_cache_division_limit= 101;
134
SELECT @@myisam_key_cache_division_limit;
136
# Age Threshold: Minimum 100, maximum UINT32_MAX
137
SET GLOBAL myisam_key_cache_age_threshold= 98;
139
SELECT @@myisam_key_cache_age_threshold;
141
SET GLOBAL myisam_key_cache_age_threshold= 5000000000;
143
SELECT @@myisam_key_cache_age_threshold;