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ce8a74f235
The main purpose of this allow one to use the --read-only option to ensure that no one can issue a query that can block replication. The --read-only option can now take 4 different values: 0 No read only (as before). 1 Blocks changes for users without the 'READ ONLY ADMIN' privilege (as before). 2 Blocks in addition LOCK TABLES and SELECT IN SHARE MODE for not 'READ ONLY ADMIN' users. 3 Blocks in addition 'READ_ONLY_ADMIN' users for all the previous statements. read_only is changed to an enum and one can use the following names for the lock levels: OFF, ON, NO_LOCK, NO_LOCK_NO_ADMIN Too keep things compatible with older versions config files, one can still use values FALSE and TRUE, which are mapped to OFF and ON. The main visible changes are: - 'show variables like "read_only"' now returns a string instead of a number. - Error messages related to read_only violations now contains the current value off readonly. Other things: - is_read_only_ctx() renamed to check_read_only_with_error() - Moved TL_READ_SKIP_LOCKED to it's logical place Reviewed by: Sergei Golubchik <serg@mariadb.org>
117 lines
3.4 KiB
Plaintext
117 lines
3.4 KiB
Plaintext
SET @start_value = @@global.read_only;
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SELECT @start_value;
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@start_value
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OFF
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'#--------------------FN_DYNVARS_139_01------------------------#'
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SET @@global.read_only = 1;
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SET @@global.read_only = DEFAULT;
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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'#---------------------FN_DYNVARS_139_02-------------------------#'
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SET @@global.read_only = @start_value;
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SELECT @@global.read_only = 0;
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@@global.read_only = 0
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1
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Warnings:
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Warning 1292 Truncated incorrect DOUBLE value: 'OFF'
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'#--------------------FN_DYNVARS_139_03------------------------#'
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SET @@global.read_only = 0;
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 1;
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SELECT @@global.read_only;
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@@global.read_only
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ON
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SET @@global.read_only = TRUE;
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SELECT @@global.read_only;
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@@global.read_only
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ON
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SET @@global.read_only = FALSE;
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = ON;
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SELECT @@global.read_only;
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@@global.read_only
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ON
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SET @@global.read_only = OFF;
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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'#--------------------FN_DYNVARS_139_04-------------------------#'
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SET @@global.read_only = -1;
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ERROR 42000: Variable 'read_only' can't be set to the value of '-1'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 4294967296;
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ERROR 42000: Variable 'read_only' can't be set to the value of '4294967296'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 10240022115;
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ERROR 42000: Variable 'read_only' can't be set to the value of '10240022115'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 10000.01;
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ERROR 42000: Incorrect argument type to variable 'read_only'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = -1024;
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ERROR 42000: Variable 'read_only' can't be set to the value of '-1024'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 42949672950;
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ERROR 42000: Variable 'read_only' can't be set to the value of '42949672950'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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SET @@global.read_only = 'test';
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ERROR 42000: Variable 'read_only' can't be set to the value of 'test'
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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'#-------------------FN_DYNVARS_139_05----------------------------#'
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SET @@session.read_only = 0;
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ERROR HY000: Variable 'read_only' is a GLOBAL variable and should be set with SET GLOBAL
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SELECT @@read_only;
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@@read_only
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OFF
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'#----------------------FN_DYNVARS_139_06------------------------#'
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SELECT @@global.read_only = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='read_only';
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@@global.read_only = VARIABLE_VALUE
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1
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SELECT @@global.read_only = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.SESSION_VARIABLES
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WHERE VARIABLE_NAME='read_only';
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@@global.read_only = VARIABLE_VALUE
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1
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'#---------------------FN_DYNVARS_139_07----------------------#'
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SET @@global.read_only = 1;
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SELECT @@read_only = @@global.read_only;
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@@read_only = @@global.read_only
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1
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'#---------------------FN_DYNVARS_139_08----------------------#'
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SET read_only = 1;
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ERROR HY000: Variable 'read_only' is a GLOBAL variable and should be set with SET GLOBAL
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SELECT @@read_only;
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@@read_only
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ON
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SELECT local.read_only;
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ERROR 42S02: Unknown table 'local' in SELECT
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SELECT global.read_only;
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ERROR 42S02: Unknown table 'global' in SELECT
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SELECT read_only = @@session.read_only;
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ERROR 42S22: Unknown column 'read_only' in 'SELECT'
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SET @@global.read_only = @start_value;
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SELECT @@global.read_only;
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@@global.read_only
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OFF
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