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Verifies that objects and columns names provided in the query or referenced by the query exist in the target database. The algebrizer performs the following tasks: In case that any error occurs here, the SQL Server parser engine returns the appropriate error information.Īlgebrizer (Object verification) – Once the parser engine verifies the T-SQL statement as valid, it passes the statement to the algebrizer. Validates that the process that issued the statement has appropriate privileges to execute that statement
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Validates the syntax of the executed T-SQL statement During the parse phase, SQL Server performs the following: Once the application runs the statement, it issues a parse call to SQL Server. Parsing (Syntax check) – this is the first stage in the processing of the T-SQL statement. Every query execution starts with the actual T-SQL statement, and when the user runs the statement, it goes through the execution steps as elaborated below: The query execution flow graphic is simplified to a certain level for easier understanding of the basic steps in query execution. SQL Server processing is based on query execution, and most of the performance problems are related to queries executed against the SQL Server. So, to better understand how and why the wait statistic, in general, is the most important for detecting and troubleshooting SQL Server performance issues, it is important to understand the mechanism of how a query executes on SQL Server, since SQL Server performance problems are the ones that most often affect end users. In aggregate, SQL Server Wait statistics are complex, comprising hundreds of wait types registered with every execution of the query.