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Bug #32223 SETting max_allowed_packet variable

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Inconsistent behavior of session variable max_allowed_packet 
(and net_buffer_length); only assignment to the global variable 
has any effect, without this being obvious to the user.
      
The patch for Bug#22891 is backported to 5.0, making the two
session variables read-only. As this is a backport to GA 
software, the error used when trying to assign to the read-
only variable is ER_UNKNOWN_ERROR. The error message is the 
same as in 5.1+.
This commit is contained in:
Staale Smedseng
2009-06-19 11:27:19 +02:00
parent 9069e110d4
commit 2b48caa42d
8 changed files with 91 additions and 51 deletions
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26
mysql-test/r/variables.result
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@ -187,7 +187,7 @@ Variable_name Value
myisam_max_sort_file_size FILE_SIZE
set global net_retry_count=10, session net_retry_count=10;
set global net_buffer_length=1024, net_write_timeout=200, net_read_timeout=300;
set session net_buffer_length=2048, net_write_timeout=500, net_read_timeout=600;
set session net_write_timeout=500, net_read_timeout=600;
show global variables like 'net_%';
Variable_name Value
net_buffer_length 1024
@ -196,35 +196,39 @@ net_retry_count 10
net_write_timeout 200
show session variables like 'net_%';
Variable_name Value
net_buffer_length 2048
net_buffer_length 16384
net_read_timeout 600
net_retry_count 10
net_write_timeout 500
set session net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
set global net_buffer_length=8000, net_read_timeout=900, net_write_timeout=1000;
show global variables like 'net_%';
Variable_name Value
net_buffer_length 1024
net_buffer_length 7168
net_read_timeout 900
net_retry_count 10
net_write_timeout 1000
show session variables like 'net_%';
Variable_name Value
net_buffer_length 7168
net_buffer_length 16384
net_read_timeout 600
net_retry_count 10
net_write_timeout 500
set net_buffer_length=1;
set global net_buffer_length=1;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '1'
show variables like 'net_buffer_length';
show global variables like 'net_buffer_length';
Variable_name Value
net_buffer_length 1024
set net_buffer_length=2000000000;
set global net_buffer_length=2000000000;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '2000000000'
show variables like 'net_buffer_length';
show global variables like 'net_buffer_length';
Variable_name Value
net_buffer_length 1048576
set session net_buffer_length=1024;
ERROR HY000: SESSION variable net_buffer_length is read-only. Use SET GLOBAL net_buffer_length to assign the value
set session max_allowed_packet=1024;
ERROR HY000: SESSION variable max_allowed_packet is read-only. Use SET GLOBAL max_allowed_packet to assign the value
set character set cp1251_koi8;
show variables like "character_set_client";
Variable_name Value
@ -393,7 +397,7 @@ set last_insert_id=1;
set global local_infile=1;
set long_query_time=100;
set low_priority_updates=1;
set max_allowed_packet=100;
set global max_allowed_packet=100;
Warnings:
Warning 1292 Truncated incorrect max_allowed_packet value: '100'
set global max_binlog_cache_size=100;
@ -417,7 +421,7 @@ select @@max_user_connections;
100
set global max_write_lock_count=100;
set myisam_sort_buffer_size=100;
set net_buffer_length=100;
set global net_buffer_length=100;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '100'
set net_read_timeout=100;