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Ask Tom

  • Finding the number of rows in each table by a single sql

    hi tom i have a databse with 125 tables. i can find the total number of tables of the database by the sql select * from tab; now i would like to know the number of rows in each table of my database with out executing select count(*) from...; each time. please help me sincerely rajesh

  • Difference between Full Index Scans and Fast Full Index Scans

    Hi Tom, What is the difference between Fast Index Scan and Fast Full Index Scan ? As per oracle documentation, A full scan is available if a predicate references one of the columns in the index. The predicate does not need to be an index driver. A full scan is also available when there is no predicate, if both the following conditions are met: ? All of the columns in the table referenced in the query are included in the index. ? At least one of the index columns is not null. A full scan can be used to eliminate a sort operation, because the data is ordered by the index key. It reads the blocks singly. Fast full index scans are an alternative to a full table scan when the index contains all the columns that are needed for the query, and at least one column in the index key has the NOT NULL constraint. A fast full scan accesses the data in the index itself, without accessing the table. It cannot be used to eliminate a sort operation, because the data is not ordered by the index key. It reads the entire index using multiblock reads, unlike a full index scan, and can be parallelized. You can specify fast full index scans with the initialization parameter OPTIMIZER_FEATURES_ENABLE or the INDEX_FFS hint. Fast full index scans cannot be performed against bitmap indexes.A fast full scan is faster than a normal full index scan in that it can use multiblock IO and can be parallelized just like a table scan . I am not clear about this.Could you please clarify. Regards; Gopal

  • IN (vs) EXISTS and NOT IN (vs) NOT EXISTS

    Hi Tom, Can you pls explain the diff between IN and EXISTS and NOT IN and NOT EXISTS. Because I have read that EXISTS will work better than IN and NOT EXISTS will work better than NOT IN (read this is Oracle server tunning). Regards, Madhusudhana Rao.P

  • ORA-12560: TNS:protocol adapter error

    i'm running oracle on standalone computer at home.it used to work properly but from couple of days i'm getting error stating ORA-12560: TNS:protocol adapter error what should i do? please help.. (scotttiger)

  • Converting CLOBS TO VARCHAR

    Can you give me a solution for converting CLOBS datatype to VARCHAR datatypes, all the documents I refer to talk about converting BLOBS to VARCHAR and when I try and apply the examples to CLOBS, get errors

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