46 lines
2.0 KiB
Plaintext
46 lines
2.0 KiB
Plaintext
include/master-slave.inc
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[connection master]
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include/stop_slave.inc
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RESET SLAVE ALL;
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include/start_slave.inc
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====================================================================
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Testing index for columns CHANNEL_NAME
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====================================================================
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############ Explain for Query ####################################
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explain select REMAINING_DELAY
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from performance_schema.replication_applier_status
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where CHANNEL_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 REMAINING_DELAY
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from performance_schema.replication_applier_status
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where CHANNEL_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 replication_applier_status NULL ALL PRIMARY NULL NULL NULL # 33.33 Using where
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############ Explain for Query ####################################
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explain select REMAINING_DELAY
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from performance_schema.replication_applier_status
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where CHANNEL_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 replication_applier_status NULL ALL PRIMARY NULL NULL NULL # 33.33 Using where
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############ Explain for Query ####################################
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explain select REMAINING_DELAY
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from performance_schema.replication_applier_status
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where CHANNEL_NAME = "channel_1";
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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 replication_applier_status NULL const PRIMARY PRIMARY 256 const # 100.00 NULL
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############# Explain End #########################################
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flush status;
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select REMAINING_DELAY
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from performance_schema.replication_applier_status
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where CHANNEL_NAME = "channel_1";
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REMAINING_DELAY
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#
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OK: handler_read_key incremented
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include/stop_slave.inc
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RESET SLAVE ALL;
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include/start_slave.inc
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include/rpl_end.inc
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