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MDEV-29104 Optimize queries to INFORMATION_SCHEMA.PARAMETERS/ROUTINES
For queries like "SELECT * FROM INFORMATION_SCHEMA.PARAMETERS WHERE SPECIFIC_NAME='proc_name'" and "SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_NAME='proc_name'" there is a possibility to avoid loading of the stored procedure code and parsing it to retrieve parameters. If the name of the procedure/function is specified explicitly then it is possible to filter out routines that do not match at an early stage.
This commit is contained in:
committed by
Oleg Smirnov
parent
035feae610
commit
d9092e3de7
@@ -635,11 +635,11 @@ USE i_s_parameters_test;
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CREATE FUNCTION test_func5 (s CHAR(20)) RETURNS VARCHAR(30)
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RETURN CONCAT('XYZ, ' ,s);
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#
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# We cannot use the index due to CONCAT()
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# We cannot use the index due to missing condition on SPECIFIC_SCHEMA,
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# but we will use SPECIFIC_NAME for filtering records from mysql.proc
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FLUSH STATUS;
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SELECT * FROM INFORMATION_SCHEMA.PARAMETERS
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WHERE CONCAT(SPECIFIC_SCHEMA) = 'i_s_parameters_test'
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AND SPECIFIC_NAME = 'test_func5';
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WHERE SPECIFIC_NAME = 'test_func5';
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SPECIFIC_CATALOG def
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SPECIFIC_SCHEMA i_s_parameters_test
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SPECIFIC_NAME test_func5
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@@ -675,7 +675,19 @@ ROUTINE_TYPE FUNCTION
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SHOW STATUS LIKE 'handler_read%next';
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Variable_name Value
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Handler_read_next 54
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Handler_read_rnd_next 97
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Handler_read_rnd_next 3
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#
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# We cannot use the index due to CONCAT(), and filtering by SPECIFIC_NAME
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# does not work either since SPECIFIC_NAME = 'not_existing_proc'. See
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# the difference in counters in comparison to the previous test
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FLUSH STATUS;
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SELECT * FROM INFORMATION_SCHEMA.PARAMETERS
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WHERE CONCAT(SPECIFIC_SCHEMA) = 'i_s_parameters_test'
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AND SPECIFIC_NAME = 'not_existing_proc';
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SHOW STATUS LIKE 'handler_read%next';
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Variable_name Value
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Handler_read_next 54
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Handler_read_rnd_next 1
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#
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# Now the index must be used
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FLUSH STATUS;
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