78 lines
3.6 KiB
Plaintext
78 lines
3.6 KiB
Plaintext
create user foo@localhost;
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grant ALL on *.* to foo@localhost;
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# Connection con
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====================================================================
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Testing index for columns HOST, VARIABLE_NAME
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====================================================================
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "impossible";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ref HOST HOST 256 const # 100.00 NULL
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST > "impossible";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ALL HOST NULL NULL NULL # 33.33 Using where
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST < "2";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ALL HOST NULL NULL NULL # 33.33 Using where
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ref HOST HOST 256 const # 100.00 NULL
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "impossible"
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and VARIABLE_NAME = "impossible";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL # NULL no matching row in const table
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost"
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and VARIABLE_NAME = "impossible";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL # NULL no matching row in const table
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost"
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and VARIABLE_NAME > "impossible";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ref HOST HOST 256 const # 33.33 Using where
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost"
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and VARIABLE_NAME < "2";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL ref HOST HOST 256 const # 33.33 Using where
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############ Explain for Query ####################################
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explain select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost"
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and VARIABLE_NAME = "Max_execution_time_exceeded";
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE status_by_host NULL const HOST HOST 514 const,const # 100.00 NULL
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############# Explain End #########################################
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flush status;
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select VARIABLE_VALUE
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from performance_schema.status_by_host
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where HOST = "localhost"
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and VARIABLE_NAME = "Max_execution_time_exceeded";
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VARIABLE_VALUE
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#
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OK: handler_read_key incremented
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# Conenction default
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drop user foo@localhost;
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