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After the WL#2687, the binlog_cache_size and max_binlog_cache_size affect both the
stmt-cache and the trx-cache. This means that the resource used is twice the amount
expected/defined by the user.
The binlog_cache_use is incremented when the stmt-cache or the trx-cache is used
and binlog_cache_disk_use is incremented when the disk space from the stmt-cache or the
trx-cache is used. This behavior does not allow to distinguish which cache may be harming
performance due to the extra disk accesses and needs to have its in-memory cache
increased.
To fix the problem, we introduced two new options and status variables related to the
stmt-cache:
Options:
. binlog_stmt_cache_size
. max_binlog_stmt_cache_size
Status Variables:
. binlog_stmt_cache_use
. binlog_stmt_cache_disk_use
So there are
. binlog_cache_size that defines the size of the transactional cache for
updates to transactional engines for the binary log.
. binlog_stmt_cache_size that defines the size of the statement cache for
updates to non-transactional engines for the binary log.
. max_binlog_cache_size that sets the total size of the transactional
cache.
. max_binlog_stmt_cache_size that sets the total size of the statement
cache.
. binlog_cache_use that identifies the number of transactions that used the
temporary transactional binary log cache.
. binlog_cache_disk_use that identifies the number of transactions that used
the temporary transactional binary log cache but that exceeded the value of
binlog_cache_size.
. binlog_stmt_cache_use that identifies the number of statements that used the
temporary non-transactional binary log cache.
. binlog_stmt_cache_disk_use that identifies the number of statements that used
the temporary non-transactional binary log cache but that exceeded the value of
binlog_stmt_cache_size.
67 lines
3.2 KiB
Plaintext
67 lines
3.2 KiB
Plaintext
drop table if exists t1, t2;
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create table t1 (a int) engine=innodb;
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create table t2 (a int) engine=myisam;
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**** Preparing the enviroment to check commit and its effect on status variables.
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**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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flush status;
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**** Transactional changes which are long enough so they will be flushed to disk...
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**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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**** Transactional changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t1 values( 1 );
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commit;
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**** Non-Transactional changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 1, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t2 values( 1 );
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commit;
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**** Mixed changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 2, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t1 values( 1 );
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insert into t2 values( 1 );
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commit;
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**** Preparing the enviroment to check abort and its effect on the status variables.
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**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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flush status;
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**** Transactional changes which are long enough so they will be flushed to disk...
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**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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**** Transactional changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 0, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t1 values( 1 );
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rollback;
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**** Non-Transactional changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 1, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t2 values( 1 );
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rollback;
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Warnings:
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Warning 1196 Some non-transactional changed tables couldn't be rolled back
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**** Mixed changes which should not be flushed to disk and so should not
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**** increase either binlog_cache_disk_use or binlog_stmt_cache_disk_use.
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**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
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**** Expected: binlog_stmt_cache_use = 2, binlog_stmt_cache_disk_use = 0.
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begin;
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insert into t1 values( 1 );
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insert into t2 values( 1 );
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rollback;
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Warnings:
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Warning 1196 Some non-transactional changed tables couldn't be rolled back
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drop table t1, t2;
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