Check Index Fragmentation in a SQL Server If we run INSERT, UPDATE or DELETE queries frequently than we can see indexes on the particular table are fragmented. And the SQL query may run slower as they may choose the non-optimal execution plan. Below script can be used for checking how much percentages of an indexes gets fragmented on a database. so that we can rebuild or reorganise the indexes. SELECT OBJECT_NAME(ind.OBJECT_ID) AS TableName, ind.name AS IndexName, indexstats.index_type_desc AS IndexType, indexstats.avg_fragmentation_in_percent FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats INNER JOIN sys.indexes ind ON ind.object_id = indexstats.object_id AND ind.index_id = indexstats.index_id WHERE indexstats.avg_fragmentation_in_percent > 10--You can specify the percent as you want AND ind.name is not null ORDER BY indexstats.avg_fragmentation_in_percent DESC

Define Is Null operator in oracle

Define Is Null operator in oracle

IS NULL operator is usually used to check if the value of a column is NULL or not.
Example:
Sql> select *from emp where comm is not null;