Abstract: Techniques and solutions are provided for controlling fans associated with battery racks located in an enclosure. The fans can be ranked according to different criteria, such as using an average temperature of cells in a battery rack, a temperature of an enclosure housing the battery racks, an average temperature of battery racks in the enclosure, or using information about the spread of cell temperature of cells in particular racks. Higher-ranked racks can have their fans turned to an active state. In some cases, different ranking techniques can be used for different operational modes of an HVAC unit in communication with the enclosure. Disclosed techniques can have various benefits, such as improving ventilation of the enclosure, prioritizing heating or cooling of particular racks, or reducing temperature gradients, or temperature spread, between battery racks in an enclosure.

Abstract: Methods and apparatuses for detecting an evaluation flaw in a SQL query, the SQL query configured to access data in a database table are disclosed. The method includes creating a parse tree from the SQL query and evaluating the parse tree to ascertain whether a condition of the SQL query results in a type or value that is independent of contents of the database table. For type evaluation, if, responsive to the evaluating, the condition is found, designating the SQL query at risk for having the tautology in the SQL query. For value evaluation, if, responsive to the evaluating, the condition is found, determining whether the condition is always true or whether the condition is always false; and if, responsive to the determining, the condition is found to be always true or always false, designating the SQL query at risk for having the evaluation flaw in the SQL query.

Abstract: Methods and apparatuses for detecting an evaluation flaw in a SQL query, the SQL query configured to access data in a database table are disclosed. The method includes creating a parse tree from the SQL query and evaluating the parse tree to ascertain whether a condition of the SQL query results in a type or value that is independent of contents of the database table. For type evaluation, if, responsive to the evaluating, the condition is found, designating the SQL query at risk for having the tautology in the SQL query. For value evaluation, if, responsive to the evaluating, the condition is found, determining whether the condition is always true or whether the condition is always false; and if, responsive to the determining, the condition is found to be always true or always false, designating the SQL query at risk for having the evaluation flaw in the SQL query.

Abstract: Methods and apparatuses for detecting an evaluation flaw in a SQL query, the SQL query configured to access data in a database table are disclosed. The method includes creating a parse tree from the SQL query and evaluating the parse tree to ascertain whether a condition of the SQL query results in a type or value that is independent of contents of the database table. For type evaluation, if, responsive to the evaluating, the condition is found, designating the SQL query at risk for having the tautology in the SQL query. For value evaluation, if, responsive to the evaluating, the condition is found, determining whether the condition is always true or whether the condition is always false; and if, responsive to the determining, the condition is found to be always true or always false, designating the SQL query at risk for having the evaluation flaw in the SQL query.

Abstract: Methods and apparatuses for detecting an evaluation flaw in a SQL query, the SQL query configured to access data in a database table are disclosed. The method includes creating a parse tree from the SQL query and evaluating the parse tree to ascertain whether a condition of the SQL query results in a type or value that is independent of contents of the database table. For type evaluation, if, responsive to the evaluating, the condition is found, designating the SQL query at risk for having the tautology in the SQL query. For value evaluation, if, responsive to the evaluating, the condition is found, determining whether the condition is always true or whether the condition is always false; and if, responsive to the determining, the condition is found to be always true or always false, designating the SQL query at risk for having the evaluation flaw in the SQL query.