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MDEV-11153 - Introduce status variables for table cache monitoring and tuning

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Status variables added: Table_open_cache_hits, Table_open_cache_misses,
Table_open_cache_overflows, Table_open_cache_active_instances.
This commit is contained in:
Sergey Vojtovich
2017-08-10 15:45:03 +04:00
parent 5d3ed9acdd
commit 613dd62a76
7 changed files with 99 additions and 9 deletions
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9
sql/sql_class.cc
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@ -1728,6 +1728,9 @@ void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var)
to_var->binlog_bytes_written+= from_var->binlog_bytes_written;
to_var->cpu_time+= from_var->cpu_time;
to_var->busy_time+= from_var->busy_time;
to_var->table_open_cache_hits+= from_var->table_open_cache_hits;
to_var->table_open_cache_misses+= from_var->table_open_cache_misses;
to_var->table_open_cache_overflows+= from_var->table_open_cache_overflows;
/*
Update global_memory_used. We have to do this with atomic_add as the
@ -1779,6 +1782,12 @@ void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
dec_var->binlog_bytes_written;
to_var->cpu_time+= from_var->cpu_time - dec_var->cpu_time;
to_var->busy_time+= from_var->busy_time - dec_var->busy_time;
to_var->table_open_cache_hits+= from_var->table_open_cache_hits -
dec_var->table_open_cache_hits;
to_var->table_open_cache_misses+= from_var->table_open_cache_misses -
dec_var->table_open_cache_misses;
to_var->table_open_cache_overflows+= from_var->table_open_cache_overflows -
dec_var->table_open_cache_overflows;
/*
We don't need to accumulate memory_used as these are not reset or used by