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afc9d00c66
Patch removes dict_index_t::stats_latch. Table/index statistics now
protected with dict_sys->mutex. That way statistics computation can
happen in parallel in several threads and dict_sys->mutex will be locked
only for a short period of time.
This patch is a joint work with Marko Mäkelä
dict_index_t:🔒 make mutable which allows to pass const pointer
when only lock is touched in an object
btr_height_get()
btr_get_size(): make index argument const for better type safety
btr_estimate_number_of_different_key_vals(): now returns computed values
instead of setting fields in dict_index_t directly
remove everything related to dict_index_t::stats_latch
dict_stats_index_set_n_diff(): now returns computed values instead
of setting fields in dict_index_t directly
dict_stats_analyze_index(): now returns computed values instead
of setting fields in dict_index_t directly
Reviewed by: Marko Mäkelä
19 lines
701 B
Plaintext
19 lines
701 B
Plaintext
#
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# MDEV-23991 dict_table_stats_lock() has unnecessarily long scope
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#
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CREATE TABLE t1(a INT) ENGINE=INNODB STATS_PERSISTENT=1;
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SET DEBUG_SYNC='dict_stats_update_persistent SIGNAL stop WAIT_FOR go';
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ANALYZE TABLE t1;
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connect con1, localhost, root;
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SET DEBUG_SYNC='now WAIT_FOR stop';
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SELECT ENGINE,SUM(DATA_LENGTH+INDEX_LENGTH),COUNT(ENGINE),SUM(DATA_LENGTH),SUM(INDEX_LENGTH) FROM information_schema.TABLES WHERE ENGINE='InnoDB';
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ENGINE SUM(DATA_LENGTH+INDEX_LENGTH) COUNT(ENGINE) SUM(DATA_LENGTH) SUM(INDEX_LENGTH)
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InnoDB 49152 3 49152 0
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SET DEBUG_SYNC='now SIGNAL go';
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disconnect con1;
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connection default;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SET DEBUG_SYNC= 'RESET';
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DROP TABLE t1;
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