There are two ways to fix this:
Execute the following in the MySQL console:
SET GLOBAL log_bin_trust_function_creators = 1;
Add the following to the mysql.ini configuration file:
log_bin_trust_function_creators = 1;
The setting relaxes the checking for non-deterministic functions. Non-deterministic functions are functions that modify data (i.e. have update, insert or delete statement(s)). For more info, see here.
Please note, if binary logging is NOT enabled, this setting does not apply.
Binary Logging of Stored Programs
If binary logging is not enabled, log_bin_trust_function_creators does
not apply.
log_bin_trust_function_creators
This variable applies when binary logging is enabled.
The best approach is a better understanding and use of deterministic declarations for stored functions. These declarations are used by MySQL to optimize the replication and it is a good thing to choose them carefully to have a healthy replication.
DETERMINISTIC
A routine is considered “deterministic” if it always produces the same result for the same input parameters and NOT DETERMINISTIC otherwise.
This is mostly used with string or math processing, but not limited to that.
NOT DETERMINISTIC
Opposite of "DETERMINISTIC".
"If neither DETERMINISTIC nor NOT DETERMINISTIC is given in the routine definition, the default is NOT DETERMINISTIC. To declare that a function is deterministic, you must specify DETERMINISTIC explicitly.".
So it seems that if no statement is made, MySQl will treat the function as "NOT DETERMINISTIC".
This statement from manual is in contradiction with other statement from another area of manual which tells that:
" When you create a stored function, you must declare either that it is deterministic or that it does not modify data. Otherwise, it may be unsafe for data recovery or replication.
By default, for a CREATE FUNCTION statement to be accepted, at least one of DETERMINISTIC, NO SQL, or READS SQL DATA must be specified explicitly. Otherwise an error occurs"
I personally got error in MySQL 5.5 if there is no declaration, so i always put at least one declaration of "DETERMINISTIC", "NOT DETERMINISTIC", "NO SQL" or "READS SQL DATA" regardless other declarations i may have.
READS SQL DATA
This explicitly tells to MySQL that the function will ONLY read data from databases, thus, it does not contain instructions that modify data, but it contains SQL instructions that read data (e.q. SELECT).
MODIFIES SQL DATA
This indicates that the routine contains statements that may write data (for example, it contain UPDATE, INSERT, DELETE or ALTER instructions).
NO SQL
This indicates that the routine contains no SQL statements.
CONTAINS SQL
This indicates that the routine contains SQL instructions, but does not contain statements that read or write data. This is the default if none of these characteristics is given explicitly. Examples of such statements are SELECT NOW(), SELECT 10+@b, SET @x = 1 or DO RELEASE_LOCK('abc'), which execute but neither read nor write data.
Note that there are MySQL functions that are not deterministic safe, such as: NOW(), UUID(), etc, which are likely to produce different results on different machines, so a user function that contains such instructions must be declared as NOT DETERMINISTIC.
Also, a function that reads data from an unreplicated schema is clearly NONDETERMINISTIC.
*
Assessment of the nature of a routine is based on the “honesty” of the
creator: MySQL does not check that a routine declared DETERMINISTIC is
free of statements that produce nondeterministic results. However,
misdeclaring a routine might affect results or affect performance.
Declaring a nondeterministic routine as DETERMINISTIC might lead to
unexpected results by causing the optimizer to make incorrect
execution plan choices. Declaring a deterministic routine as
NONDETERMINISTIC might diminish performance by causing available
optimizations not to be used.
