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POTroubleshooting MySQL to MSSQL PHP Query Translation and Speed
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Firstly, if this is not the place for this type of question then please let me know and I will delete it. OK, so I have a MySQL PHP query translation class that translates to MSSQL among other databases. The following test file produces the following results (Debugging enabled) Test_File.php <pre><code>include 'session_handler.php'; include 'database_connection.php'; $result = $db->query("SELECT * FROM industries LIMIT 5"); </code></pre> MySQL Results: <pre><code>Query time was 0.00622892379761 seconds for: SELECT * FROM industries LIMIT 5 Query time was 0.000350952148438 seconds for: SELECT "session_id" FROM "sessions" WHERE "session_id" = '58' Query time was 0.000293016433716 seconds for: UPDATE "sessions" SET "value" = 'x', "expiration" = '0' WHERE "session_id" = '58' Total query time: 0.00848698616028 seconds </code></pre> MSSQL Results <pre><code> Query time was 0.21740579605103 seconds for: SELECT c.table_schema AS "schema", c.table_name AS "table", c.column_name AS "column", c.data_type AS "type" FROM INFORMATION_SCHEMA.COLUMNS AS c WHERE (c.data_type = 'nvarchar' OR c.data_type = 'ntext' OR c.data_type = 'nchar') AND c.table_catalog = DB_NAME() ORDER BY lower(c.table_name) ASC, lower(c.column_name) ASC Query time was 0.21066212654114 seconds for: SELECT TOP 5 *, CAST("industries"."industry" AS VARBINARY(MAX)) AS fmssqln__industry FROM industries Query time was 0.21116590499878 seconds for: SELECT "session_id" FROM "sessions" WHERE "session_id" = '58' Query time was 0.21582698822021 seconds for: UPDATE "sessions" SET "value" = x, "expiration" = '0' WHERE "session_id" = '58' Total query time: 1.7053256034851 seconds </code></pre> As you can see the MySQL query is extremely quick, whilst the converted query (converted by the class) take almost 2 seconds. I don't know anything about the syntax of MSSQL so I am not sure if the converted query is as optimised as it could be? So my questions are - is the converted MSSQL query a correct translation from the MySQL query, and where should I start to troubleshoot the speed issue? Additional Information: The MSSQL and MySQL database and tables are identical, content and schema wise. Thanks
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<php><mysql><sql-server>
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Troubleshooting MySQL to MSSQL PHP Query Translation and Speed
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