MariaDB ODBC连接器性能问题

我们尝试从MySQL 5.0.96切换到MariaDB 10.5.9。将数据移动到MariaDB服务器很容易，但问题在于MariaDB ODBC连接器的速度。我尝试了3.1.12，默认设置没有SSL，我们的应用程序（大部分是在Embarcadero RAD Studio中编写的）显示出非常差的性能。当我尝试MySQL ODBC connector 8.0.24时，一切都很顺利。通过MariaDB连接器的查询速度慢了3-5倍。在常规查询日志中，我发现MariaDB的连接器生成了大量对信息\u scheme.columns表的查询，并重复读取变量TX\u。 一般查询日志的简短摘录-MariaDB连接器：

3 Query    SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='TX_ISOLATION'
3 Prepare    select * from stanice
3 Execute    select * from stanice
3 Prepare    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION              
3 Execute    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Close stmt
3 Reset stmt
3 Query    SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='TX_ISOLATION'
3 Prepare    SELECT * FROM stanice WHERE Sit_ID = ? ORDER BY Sit_ID, Podsit_ID, ID
3 Execute    SELECT * FROM stanice WHERE Sit_ID = 1 ORDER BY Sit_ID, Podsit_ID, ID
3 Prepare    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Execute    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Close stmt
3 Reset stmt

3 Query    SELECT @@tx_isolation
...
3 Query    select * from stanice
3 Prepare    SELECT * FROM stanice WHERE Sit_ID = ? ORDER BY Sit_ID, Podsit_ID, ID
3 Execute    SELECT * FROM stanice WHERE Sit_ID = '1' ORDER BY Sit_ID, Podsit_ID, ID
3 Close stmt

MySQL连接器：

3 Query    SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='TX_ISOLATION'
3 Prepare    select * from stanice
3 Execute    select * from stanice
3 Prepare    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION              
3 Execute    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Close stmt
3 Reset stmt
3 Query    SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='TX_ISOLATION'
3 Prepare    SELECT * FROM stanice WHERE Sit_ID = ? ORDER BY Sit_ID, Podsit_ID, ID
3 Execute    SELECT * FROM stanice WHERE Sit_ID = 1 ORDER BY Sit_ID, Podsit_ID, ID
3 Prepare    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Execute    SELECT TABLE_SCHEMA AS TABLE_CAT, NULL AS TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, ORDINAL_POSITION KEY_SEQ, 'PRIMARY' PK_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_KEY = 'pri' AND TABLE_SCHEMA LIKE 'unicentrum' AND TABLE_NAME LIKE 'stanice'  ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION
3 Close stmt
3 Reset stmt

3 Query    SELECT @@tx_isolation
...
3 Query    select * from stanice
3 Prepare    SELECT * FROM stanice WHERE Sit_ID = ? ORDER BY Sit_ID, Podsit_ID, ID
3 Execute    SELECT * FROM stanice WHERE Sit_ID = '1' ORDER BY Sit_ID, Podsit_ID, ID
3 Close stmt

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我认为这些“不必要的”查询正在改变这些连接器的性能。我能做些什么来加速MariaDB的连接器？谢谢

我已经为您描述的问题打开了大门。最好继续，因为至少需要使用两个驱动程序运行的ODBC跟踪来解决主要问题。

我已经为您描述的问题打开了窗口。最好继续，因为至少需要使用两个驱动程序运行的ODBC跟踪来解决主要问题。

您确定Embarcadero RAD Studio没有生成那个些草率的代码吗？我不这么认为。相同的程序和数据库服务器。我只切换了连接器。你确定Embarcadero RAD Studio没有生成那个草率的代码吗？我不这么认为。相同的程序和数据库服务器。我只换了连接器。