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52c29f3bdc
Heap tables are allocated blocks to store rows according to my_default_record_cache (mapped to the server global variable read_buffer_size). This causes performance issues when the record length is big (> 1000 bytes) and the my_default_record_cache is small. Changed to instead split the default heap allocation to 1/16 of the allowed space and not use my_default_record_cache anymore when creating the heap. The allocation is also aligned to be just under a power of 2. For some test that I have been running, which was using record length=633, the speed of the query doubled thanks to this change. Other things: - Fixed calculation of max_records passed to hp_create() to take into account padding between records. - Updated calculation of memory needed by heap tables. Before we did not take into account internal structures needed to access rows. - Changed block sized for memory_table from 1 to 16384 to get less fragmentation. This also avoids a problem where we need 1K to manage index and row storage which was not counted for before. - Moved heap memory usage to a separate test for 32 bit. - Allocate all data blocks in heap in powers of 2. Change reported memory usage for heap to reflect this. Reviewed-by: Sergei Golubchik <serg@mariadb.org>
50 lines
2.3 KiB
Text
50 lines
2.3 KiB
Text
--echo #
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--echo # Test of heap table memory usage
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--echo #
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--source include/word_size.inc
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#
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# Show that MIN_ROWS and MAX_ROWS have an effect on how data_length
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# and index_length are allocated.
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# Result is different for 32 / 64 bit machines as pointer lengths are different
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#
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CREATE TABLE t1 (a int, index(a)) engine=heap min_rows=10 max_rows=100;
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insert into t1 values(1);
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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drop table t1;
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CREATE TABLE t1 (a int, index(a)) engine=heap min_rows=10 max_rows=10000;
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insert into t1 values(1);
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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drop table t1;
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CREATE TABLE t1 (a int, index(a)) engine=heap min_rows=3000 max_rows=3000;
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insert into t1 values(1);
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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drop table t1;
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CREATE TABLE t1 (a int, index(a)) engine=heap max_rows=15000;
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insert into t1 values(1);
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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drop table t1;
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create table t1 (c1 int, index(c1)) engine=heap max_rows=10000;
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insert into t1 select rand(100000000);
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1;
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insert into t1 select rand(100000000) from t1 limit 488;
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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insert into t1 select rand(100000000) from t1 limit 1;
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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insert into t1 select rand(100000000) from t1 limit 1000;
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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insert into t1 select rand(100000000) from t1;
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select data_length,index_length from information_schema.tables where table_schema="test" and table_name="t1";
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drop table t1;
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