Update Statistics With Full Scan in SQL Server We all know to keep auto statistics update ON for a SQL server databases little overkill the performance and query may or may not use correct statistics and may choose the non-optimal execution plan. This may slow down the performance of complex queries to be run faster. Also, it is not a good idea to rebuild fragmented indexes every day in a busy production environment where thousands of query already running and there is no window for database maintenance task. When you will run index rebuild operation on a busy database you may encounter Query Timeout error for other running queries on a larger database. So the alternative and best solution are to update statistics with a full scan. Assuming you already knowing update statistics with sp_updatestats only update statistics a sample of records of the table and with full scan, it will scan the entire table. DECLARE @tablename varchar(80),@shemaname varchar(80) DECLARE @SQL AS NVARCHAR(200) DECLARE TblName_cursor CURSOR FOR SELECT t.name,s.name FROM sys.tables t join sys.schemas s on s.schema_id=t.schema_id OPEN TblName_cursor FETCH NEXT FROM TblName_cursor INTO @tablename,@shemaname WHILE @@FETCH_STATUS = 0 BEGIN SET @SQL = 'UPDATE STATISTICS '+@shemaname+'.[' + @TableName + '] WITH FULLSCAN ' EXEC sp_executesql @statement = @SQL FETCH NEXT FROM TblName_cursor INTO @tablename,@shemaname END CLOSE TblName_cursor DEALLOCATE TblName_cursor Instead of updating statistics for each table we can use below script to update statistics for all tables of a database

I try to connect my models create with sequelize . but I have an sql error. SqlError: (, SQLState: 42000) Too many keys specified; max 64 keys allowed

Bhuvneshwar

text: 'Too many keys specified; max 64 keys allowed', sql: 'ALTER TABLE Universites CHANGE denomination denomination VARCHAR(255) NOT NULL UNIQUE;', fatal: false, errno: 1069, sqlState: '42000', code: 'ER_TOO_MANY_KEYS', parameters: undefined }, sql: 'ALTER TABLE Universites CHANGE denomination denomination VARCHAR(255) NOT NULL UNIQUE;', parameters: {}