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14685b10df
The motivation of introducing the parameter innodb_purge_rseg_truncate_frequency in mysql/mysql-server@28bbd66ea5 and mysql/mysql-server@8fc2120fed seems to have been to avoid stalls due to freeing undo log pages or truncating undo log tablespaces. In MariaDB Server, innodb_undo_log_truncate=ON should be a much lighter operation than in MySQL, because it will not involve any log checkpoint. Another source of performance stalls should be trx_purge_truncate_rseg_history(), which is shrinking the history list by freeing the undo log pages whose undo records have been purged. To alleviate that, we will introduce a purge_truncation_task that will offload this from the purge_coordinator_task. In that way, the next innodb_purge_batch_size pages may be parsed and purged while the pages from the previous batch are being freed and the history list being shrunk. The processing of innodb_undo_log_truncate=ON will still remain the responsibility of the purge_coordinator_task. purge_coordinator_state::count: Remove. We will ignore innodb_purge_rseg_truncate_frequency, and act as if it had been set to 1 (the maximum shrinking frequency). purge_coordinator_state::do_purge(): Invoke an asynchronous task purge_truncation_callback() to free the undo log pages. purge_sys_t::iterator::free_history(): Free those undo log pages that have been processed. This used to be a part of trx_purge_truncate_history(). purge_sys_t::clone_end_view(): Take a new value of purge_sys.head as a parameter, so that it will be updated while holding exclusive purge_sys.latch. This is needed for race-free access to the field in purge_truncation_callback(). Reviewed by: Vladislav Lesin
52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
create table t1 (c1 int, c2 geometry not null, spatial index (c2))engine=innodb ROW_FORMAT=COMPRESSED;
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insert into t1 values(1, Point(1,1));
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insert into t1 values(2, Point(2,2));
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insert into t1 values(3, Point(3,3));
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insert into t1 values(4, Point(4,4));
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insert into t1 values(5, Point(5,5));
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insert into t1 values(6, Point(6,6));
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insert into t1 values(7, Point(7,7));
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insert into t1 values(8, Point(8,8));
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insert into t1 values(9, Point(9,9));
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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insert into t1 select * from t1;
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start transaction;
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insert into t1 select * from t1;
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select count(*) from t1;
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count(*)
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18432
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rollback;
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check table t1;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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select count(*) from t1;
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count(*)
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9216
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set @g1 = ST_GeomFromText('Polygon((0 0,0 100,100 100,100 0,0 0))');
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select count(*) from t1 where MBRWithin(t1.c2, @g1);
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count(*)
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9216
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set @g1 = ST_GeomFromText('Polygon((10 10,10 800,800 800,800 10,10 10))');
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select count(*) from t1 where MBRWithin(t1.c2, @g1);
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count(*)
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0
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SET @saved_dbug = @@SESSION.debug_dbug;
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SET DEBUG='+d,page_copy_rec_list_start_compress_fail';
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Warnings:
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Warning 1287 '@@debug' is deprecated and will be removed in a future release. Please use '@@debug_dbug' instead
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delete from t1;
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select count(*) from t1 where MBRWithin(t1.c2, @g1);
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count(*)
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0
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SET debug_dbug = @saved_dbug;
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InnoDB 0 transactions not purged
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drop table t1;
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