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Oracle Unused Column
 
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Oracle unused column https://easy-learning-tech.blogspot.com/2018/05/unused-column-in-oracle.html
Views: 190 Siva Academy
Oracle Pseudo Column, Virtual Column , Invisible Column and Unused Column
 
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More Details at, Pseudo Column @ https://www.youtube.com/edit?o=U&video_id=GIGmZwShGh4 Virtual Column @ https://www.youtube.com/edit?o=U&video_id=qUALFDzLDJw Invisible Column @ https://www.youtube.com/edit?o=U&video_id=nz48CdgDCt4 Unused Column @ https://www.youtube.com/edit?o=U&video_id=GWo4VcNZo6Y
Views: 412 Siva Academy
#48 ORACLE DROP COLUMN UNUSED COLUMNS حذف وتعطيل الاعمدة اوراكل
 
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البلاي ليست من هنا https://www.youtube.com/playlist?list=PLHIfW1KZRIfk-9tUSWTcM23lgnoAlRmMZ ....................... اكاديمية حسونة - ادخل سجل في موقع ويب الاكاديمية من الرابط التالي https://www.hassouna-academy.com/
Views: 123 Hassouna Academy
Oracle Sql Step by Step Approach (074 pseudo columns)
 
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Oracle Sql Step by Step Approach (074 pseudo columns) Discover essential SQL skills necessary to transform you into SQL developer which can earn you $70k+ in the IT Industry Learn to become a fee-earning SQL developer in just seven weeks. This fast, easy and effective course will take you from zero sql writing skills to being able to make money as a SQL developer. This one-stop-shot-style SQL course will teach you everything you need to know about SQL, from learning various database concepts to writing SQL to interact with the database. Throughout this SQL course I will be using the below methodology to make you think and help in forming the SQL statement. Like,Comment,Share
Oracle tutorial : What is Virtual column in Oracle PL SQL
 
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This video will show you " Oracle tutorial: What is Virtual column in Oracle PL SQL " sql calculated field computed column oracle-11g-new-feature-virtual-column Oracle tutorial : What is Virtual column in oracle Syntax : column_name [datatype] [GENERATED ALWAYS] AS [expression] [VIRTUAL] 1)The values of the virtual column are not stored in the database. 2)You can not update the values of virtual column. 3)when you try to modify it will give oracle error. 4)These are read only values. 5)Virtual columns used in the WHERE clause of UPDATE and DELETE statement 6)Constraints can be created on them. #techquerypond https://techquerypond.wordpress.com https://twitter.com/techquerypond
Views: 1601 Tech Query Pond
【VDEDU】Unusable indexes use
 
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Unusable indexes in Oracle, DML statements are not use the index to its maintenance, at the same time the optimizer will not use the index. Unusable indexes no segment exists. Unavailable index index becomes available methods are: 1. Place the index can not be truncate operation corresponding table; 2.rebuild index; In addition, the query optimizer can use conversion method expand table so that the SQL statement has encountered unusable index partition table to generate better execution plans.
Views: 71 崔旭
Pseudo Columns: LEVEL
 
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Views: 1006 Geeky Abhijeet
Oracle Tutorial - How to add virtual column in oracle 11g
 
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Hello friends in this video i'm going to demonstrate you how to add virtual column in ORACLE 11g step by step. Oracle 11g supports virtual columns which are derived from the other columns in the table. You can use the virtual columns in your queries, you can index them, you can collect the statistics, etc. There are few restrictions on the virtual columns. You cannot write/insert the data into virtual columns. There is no support for index_organized, external, object, cluster, temporary tables.
Views: 1469 OCP Technology
oracle package initialization block or one time procedure
 
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oracle package initialization block or one time procedure Click here to subscribe to my youtube channel http://www.youtube.com/channel/UCBt6VrxAIb5jLh9HLDcdwtQ?sub_confirmation=1 Oracle Interview questions and Answers at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vr0v4wVyvT3GEuA0J0M4xBm Oracle 18C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vqe06V1tIBcvnslMPWX69bW Oracle 12C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1VqM1u2IHWzZIgziqejl6wx- Oracle PLSQL records and collections at https://www.youtube.com/playlist?list=PLb1qVSx1k1VpAFTXopXvAh_D3PLcTntdm
Views: 282 Siva Academy
Oracle Virtual Column
 
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Oracle Virtual Column https://easy-learning-tech.blogspot.in/2018/05/virtual-column-in-oracle.html
Views: 288 Siva Academy
Oracle Pseudo columns
 
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pseudo columns in oracle
Views: 597 Siva Academy
Oracle Virtual Column vs pseudo column
 
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Oracle Virtual Column vs pseudo column Details on pseudo column @ https://youtu.be/GIGmZwShGh4 Details on Virtual Column @ https://youtu.be/qUALFDzLDJw
Views: 239 Siva Academy
002 Virtual Columns
 
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Views: 972 Kartik Mundhra
How to create Virtual Columns in Oracle Database
 
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How to create Virtual Columns in Oracle Database 12c When queried, virtual columns appear to be normal table columns, but their values are derived rather than being stored on disc. The syntax for defining a virtual column is listed below. column_name [datatype] [GENERATED ALWAYS] AS (expression) [VIRTUAL] If the datatype is omitted, it is determined based on the result of the expression. The GENERATED ALWAYS and VIRTUAL keywords are provided for clarity only. The script below creates and populates an employees table with two levels of commission. It includes two virtual columns to display the commission-based salary. The first uses the most abbreviated syntax while the second uses the most verbose form. CREATE TABLE employees ( id NUMBER, first_name VARCHAR2(10), last_name VARCHAR2(10), salary NUMBER(9,2), comm1 NUMBER(3), comm2 NUMBER(3), salary1 AS (ROUND(salary*(1+comm1/100),2)), salary2 NUMBER GENERATED ALWAYS AS (ROUND(salary*(1+comm2/100),2)) VIRTUAL, CONSTRAINT employees_pk PRIMARY KEY (id) ); INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2) VALUES (1, 'JOHN', 'DOE', 100, 5, 10); INSERT INTO employees (id, first_name, last_name, salary, comm1, comm2) VALUES (2, 'JAYNE', 'DOE', 200, 10, 20); COMMIT; Querying the table shows the inserted data plus the derived commission-based salaries. SELECT * FROM employees; ID FIRST_NAME LAST_NAME SALARY COMM1 COMM2 SALARY1 SALARY2 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 1 JOHN DOE 100 5 10 105 110 2 JAYNE DOE 200 10 20 220 240 2 rows selected. SQL The expression used to generate the virtual column is listed in the DATA_DEFAULT column of the [DBA|ALL|USER]_TAB_COLUMNS views. COLUMN data_default FORMAT A50 SELECT column_name, data_default FROM user_tab_columns WHERE table_name = 'EMPLOYEES'; COLUMN_NAME DATA_DEFAULT ------------------------------ -------------------------------------------------- ID FIRST_NAME LAST_NAME SALARY COMM1 COMM2 SALARY1 ROUND("SALARY"*(1+"COMM1"/100),2) SALARY2 ROUND("SALARY"*(1+"COMM2"/100),2) 8 rows selected. SQL Notes and restrictions on virtual columns include: 1)Indexes defined against virtual columns are equivalent to function-based indexes. 2)Virtual columns can be referenced in the WHERE clause of updates and deletes, but they cannot be manipulated by DML. 3)Tables containing virtual columns can still be eligible for result caching. 4)Functions in expressions must be deterministic at the time of table creation, but can subsequently be recompiled and made non-deterministic without invalidating the virtual column. In such cases the following steps must be taken after the function is recompiled: a)Constraint on the virtual column must be disabled and re-enabled. b)Indexes on the virtual column must be rebuilt. c)Materialized views that access the virtual column must be fully refreshed. d)The result cache must be flushed if cached queries have accessed the virtual column. e)Table statistics must be regathered. 5)Virtual columns are not supported for index-organized, external, object, cluster, or temporary tables. 6)The expression used in the virtual column definition has the following restrictions: a.It cannot refer to another virtual column by name. b.It can only refer to columns defined in the same table. c.If it refers to a deterministic user-defined function, it cannot be used as a partitioning key column. e.The output of the expression must be a scalar value. It cannot return an Oracle supplied datatype, a user-defined type, or LOB or LONG RAW.
Views: 603 OracleDBA
Subscriber Comments Reply Video 10 Modifying the order of column without dropping the table
 
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Subscriber Comments Reply Video 10 Modifying the order of column without dropping the table Link for "Oracle Invisible Column" https://youtu.be/nz48CdgDCt4 Link for "Oracle Pseudo Column, Virtual Column , Invisible Column and Unused Column" https://youtu.be/HgVD8oHhGh0 Click here to subscribe to my youtube channel http://www.youtube.com/channel/UCBt6VrxAIb5jLh9HLDcdwtQ?sub_confirmation=1 Oracle Interview questions and Answers at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vr0v4wVyvT3GEuA0J0M4xBm Oracle 18C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1Vqe06V1tIBcvnslMPWX69bW Oracle 12C New features at https://www.youtube.com/playlist?list=PLb1qVSx1k1VqM1u2IHWzZIgziqejl6wx- Oracle PLSQL records and collections at https://www.youtube.com/playlist?list=PLb1qVSx1k1VpAFTXopXvAh_D3PLcTntdm
Views: 598 Siva Academy
061-Oracle SQL 12c: Set unused option -read only- drop table
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر
Views: 1989 khaled alkhudari
Column-Level Virtual Private Database (VPD)
 
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Hi guys today we learn about security using VPD in oracle 11g release 2 to hide data from unauthorized users.#VirtualPrivateDatabase #VPD Oracle database Unbeatable,Unbreakable Platform..
Views: 2207 Oracle World
Data Definition Language || Select Part 1 || Learn Oracle
 
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CREATE TABLE# Create table table_name (col1 datatype1, col2 datatype2 ,coln datatypen); Ex: SQL create table student (no number (2), name varchar (10), marks number (3)); ALTER# This can be used to add or remove columns and to modify the precision of the datatype. a) ADDING COLUMN Syntax: alter table table_name add (col datatype); Ex: SQLalter table student add sdob date; b) REMOVING COLUMN Syntax: alter table table_name drop (col datatype); Ex: SQL alter table student drop column sdob; c) INCREASING OR DECREASING PRECISION OF A COLUMN Syntax: alter table (table_name) modify (col datatype); Ex: SQL alter table student modify marks number(5); Note* To decrease precision the column should be empty. d) MAKING COLUMN UNUSED Syntax: alter table table_name set unused column col; Ex: SQL alter table student set unused column marks; Even though the column is unused still it will occupy memory. e) DROPPING UNUSED COLUMNS Syntax: alter table table_name drop unused columns; Ex: SQL alter table student drop unused columns; Note* You can not drop individual unused columns of a table. f) RENAMING COLUMN Syntax: alter table table_name rename column (old_col_name) to (new_col_name); Ex: SQL alter table student rename column marks to smarks;
Views: 0 GSR Tech
skip_unusable_indexes is NOT skipping unusable indexes!
 
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blog: connor-mcdonald.com Highlights from the April DBA Office Hours session. Office Hours is 100% free Q&A sessions held every month by Oracle experts to help you succeed with the Oracle suite of technologies. Music: Smells Like Summer - Del (Vlog Music No Copyrighted) Video Link: https://youtu.be/IrkMsqcOjGU
Views: 343 Connor McDonald
Multiple Indexes on the Same Set of Columns
 
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This video demonstrates how you can use invisible indexes to allow multiple indexes on the same set of columns. Multiple indexes on the same column set is a new feature in Oracle 12c. For more information see: https://oracle-base.com/articles/12c/multiple-indexes-on-same-set-of-columns-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Scott Spendolini Blog: http://spendolini.blogspot.co.uk/ Twitter: https://twitter.com/sspendol Website: http://www.sumnertech.com/ Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 1489 ORACLE-BASE.com
Oracle Tutorials  |  How to build virtual columns | Tamil
 
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How to build virtual columns in oracle 11g
Views: 129 Practical World
Exploring a Schema in SQL Developer - Oracle SQL - 100
 
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Oracle SQL Developer Tutorial For Beginners Series. This course introduces Oracle SQL Development for its subscribers. Currently this is based on Oracle 12c. The test environment is in Windows 10.
Views: 2964 Sam Dhanasekaran
How to Detect Soft Corruption in Oracle 12c Database
 
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Detection of Soft Corruption in 12c: To use the scripts below replace : , ",# and $ by proper bracket Lets Create a tablespace and small table. SQL: create tablespace DEMO1 datafile '/u02/tstdb1/TSTDB1/datafile/demo01.dbf' size 50M SQL: create table objects tablespace DEMO1 as select * from dba_objects; SQL: alter table objects add constraint pk_obj primary key #object_id$; SQL: create index idx_obj_name on objects#object_name$ tablespace demo1; Backup tablespace. RMAN: backup tablespace DEMO1; We need to put the DB in archivelog first Rebuild index with NOLOGGING option to simulate soft corruption later. RMAN: alter index idx_obj_name rebuild nologging; Confirm that we have datafiles that require backup because they have been affected with NOLOGGING operation. RMAN: report unrecoverable; Simulate corruption. RMAN: alter database datafile 5 offline; RMAN: restore datafile 5; RMAN: recover datafile 5; RMAN: alter database datafile 5 online; Query table with corrupted index and notice error. SQL: select count#*$ from objects where object_name like 'A%'; Let’s perform validation of datafile to check block corruption. RMAN: backup validate check logical datafile 5; Notice that we have 457 blocks marked corrupt but v$database_block_corruption view is empty. SQL: select count#*$ from v$database_block_corruption; Let’s query v$nonlogged_block view. set lines 200 set pages 999 select file#, block#, blocks,object#,reason from v$nonlogged_block; Will RMAN detect that we have corrupted blocks? RMAN: backup datafile 5; RMAN backup won’t fail due to NOLOGGING corrupt blocks and our backup will contain soft corrupted blocks. Let’s Identify corrupt segments using v$nonlogged_block view. set lines 2000 set pages 9999 col owner for a20 col partition_name for a10 col segment_name for a20 SELECT e.owner, e.segment_type, e.segment_name, e.partition_name, c.file# , greatest#e.block_id, c.block#$ corr_start_block# , least#e.block_id+e.blocks-1, c.block#+c.blocks-1$ corr_end_block# , least#e.block_id+e.blocks-1, c.block#+c.blocks-1$ - greatest#e.block_id, c.block#$ + 1 blocks_corrupted FROM dba_extents e, V$NONLOGGED_BLOCK c WHERE e.file_id = c.file# AND e.block_id "= c.block# + c.blocks - 1 AND e.block_id + e.blocks - 1 := c.block# UNION SELECT s.owner, s.segment_type, s.segment_name, s.partition_name, c.file# , header_block corr_start_block# , header_block corr_end_block# , 1 blocks_corrupted FROM dba_segments s, V$NONLOGGED_BLOCK c WHERE s.header_file = c.file# AND s.header_block between c.block# and c.block# + c.blocks - 1 UNION SELECT null owner, null segment_type, null segment_name, null partition_name, c.file# , greatest#f.block_id, c.block#$ corr_start_block# , least#f.block_id+f.blocks-1, c.block#+c.blocks-1$ corr_end_block# , least#f.block_id+f.blocks-1, c.block#+c.blocks-1$ - greatest#f.block_id, c.block#$ + 1 blocks_corrupted FROM dba_free_space f, V$NONLOGGED_BLOCK c WHERE f.file_id = c.file# AND f.block_id "= c.block# + c.blocks - 1 AND f.block_id + f.blocks - 1 := c.block# order by file#, corr_start_block# / This is the best outcome to get if you notice corruption errors. All errors are related to index corruption so we could fix this problem rebuilding index. alter index idx_obj_name rebuild; Simply issuing "alter index rebuild" command won't work. We should mark index unusable to drop segment before rebuilding it or just rebuild index with online option. It is better choice to mark index unusable because you don't need additional space then, but I will simply rebuild index with online option and see what will happen. SQL: alter index idx_obj_name rebuild online; Index altered. SQL: select count#*$ from objects where object_name like 'A%'; No errors... but, let's validate datafile for corruption. RMAN: backup validate check logical datafile 5; Notice "Marked Corrupt" column. Hm... 457 like before. Don't worry, this is not new corruption. These are FREE blocks which will be reused and Oracle will automatically re-format those blocks. Query the v$nonlogged_block view again as given above. We could force re-formatting creating dummy table and inserting data to dummy table. Check Doc ID 336133.1. create table s # n number, c varchar2#4000$ $ nologging tablespace DEMO1; SQL: BEGIN FOR i IN 1..1000000 LOOP INSERT /*+ APPEND */ INTO sys.s select i, lpad#'REFORMAT',3092, 'R'$ from dual; commit ; END LOOP; END; / SQL: drop table sys.s purge; Notice that we don't have corrupted blocks any more. RMAN: backup validate check logical datafile 5;
Views: 247 OracleDBA
SQL Magic Trick: Invisible Columns  with Chris Saxon
 
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So many new features in Oracle Database 12c allow DBAs and Developers to work magic... Watch this SQL Magic Trick with Chris Saxon, Oracle SQL Developer advocate and member of the AskTOM team
Views: 215 Oracle Developers
07 04 Index Column Order Matters
 
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ORACLE
Views: 110 oracle ocm
Oracle 12C New Feature DDL Logging
 
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oracle 12c new features How to enable DDL Logging in oracle? oracle 12c new features for developers
Views: 507 Siva Academy
08 09 Demo   Invisible Indexes
 
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ORACLE
Views: 212 oracle ocm
How do I find the Overall Database size ?
 
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Hi friend in my today scenario you learn how to find the total database size ? Oracle database Unbeatable,Unbreakable Platform.. #Databasesize
Views: 3330 Oracle World
What Impact Do Indexes Have on Inserts?: Finding All the Red Sweets Part 0
 
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Creating indexes can improve query performance. Oracle must maintain the indexes however. This increases the work it must do whenever you modify data in indexed columns. In this video Chris looks at this overhead using a real world analogy - recording the color of all the candies stored in party bags! ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 2956 The Magic of SQL
20. SQL for Beginners - ROWID & ROWNUM (Hindi)
 
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Welcome to JavaScript for Beginner Series. In this video, you'll learn about Redirect and Page Print techniques in Javascript. So, let's get started. JavaScript Playlist: https://www.youtube.com/playlist?list=PLysly0KYnAY2tLfvp7bCL3c-psMH9Czs6 HTML Playlist: https://www.youtube.com/playlist?list=PLysly0KYnAY2_-PqGSrVTgBpVshxpqQlw Mobile Responsive Form using HTML & CSS: https://www.youtube.com/watch?v=SECTfL3R0B0&t=0s&index=1&list=PLysly0KYnAY3TW2A2ey5tdRK_UMRWw2Xu SQL Playlist: https://www.youtube.com/playlist?list=PLysly0KYnAY2q8cobbotVbn36XOskQR2F FACEBOOK PAGE https://www.facebook.com/ishwaracademy/
Views: 471 Ishwar Academy
6-Add Drop Modify Rename Disable Enable truncate  unused column Cascade Update Delete.avi
 
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Columns -- Constraints -- Add Drop Modify Rename Disable Enable truncate -- unused column -- Cascade Update Delete.
Views: 1549 Adel Sabour
064-Oracle SQL 12c: Alter table and constraints
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر
Views: 1706 khaled alkhudari
Rownum and Rowid PL SQL Oracle
 
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Difference between rownum and rowid
Views: 82 Techie IT
073-Oracle SQL 12c: Creating Sequences part 1
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر EXAM 1Z0-061 EXAM 1Z0-071
Views: 1863 khaled alkhudari
071-Oracle SQL 12c: Data Dictionary Views part 3
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر EXAM 1Z0-061 EXAM 1Z0-071
Views: 1556 khaled alkhudari
AskTOM TV - Direct path read
 
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A video to help you understand the "thought process" behind answering AskTom questions. In this episode, we look at direct path reads and how they interact with objects that may already have changed buffers in the buffer cache blog: https://connor-mcdonald.com
Views: 650 Connor McDonald
066-Oracle SQL 12c: Tips you should know part 2
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر EXAM 1Z0-061 EXAM 1Z0-071
Views: 1552 khaled alkhudari
7- Oracle Database insert - update - delete - intro select - -char functions.avi
 
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7-Oracle Database - SQL - insert - update - delete - intro select - working with dates and default value - to_date and to_char functions.avi
Views: 2766 Adel Sabour
08 08 Invisible Indexes
 
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ORACLE
Views: 141 oracle ocm
TSQL: Find Unused Tables
 
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I applaud the author of the article for looking at this, as it's challenging. I would be very careful though before making some of the assumptions; we want to be sure that something is unused, and we should always have discussions with application developers to make sure we don't disrupt what they're doing.
Views: 84 SQLInSix Minutes
063-Oracle SQL 12c: Very nice DDL practice 2
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر
Views: 1535 khaled alkhudari
How Many Indexes Are Too Many?: Finding All The Red Sweets Part 5
 
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Every index you add to a table increases its storage requirements and DML overheads. So it's a good idea to create as few as possible. When you have two or more indexes using the same columns, you may be able to get away with just one. But how do you decide which to keep? This video discusses how to analyze your queries so you can cut the number of indexes you create. ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 2549 The Magic of SQL
How to Add Multiple Columns to a SQL Server Table in Single Statement- TSQL Tutorial
 
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Sometime we have to add multiple columns to the already existing table. Instead of adding one column at a time we can add multiple columns in one SQL statement. blog post link for scripts used in this video http://sqlage.blogspot.com/2013/12/tsql-alter-table-add-multiple-columns.html
Views: 7554 TechBrothersIT
How to Delete Huge Data from a SQL Server Table in Small Chunks - SQL Server / TSQL Tutorial
 
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In this video you will learn how to delete large number of records from a SQL Server Table. By watch this video you will learn following topics 1--How to Delete large number of records from SQL Server Table in small chunks 2--What is the difference between Full Recovery Mode and Simple Recovery Mode 3--Does Transactional Log file grow if we set the database to Simple Recovery and Delete huge number or records? 4--How to get the record count while Transactions is deleting the records by using NoLock Option 5--How to Shrink Log file and release unused space to Operating System 6- How to write script to delete records in small chunks from SQL Server Table Blog post link for scripts used in the video: http://sqlage.blogspot.com/2015/03/how-to-delete-huge-data-from-sql-server.html
Views: 10570 TechBrothersIT
Excluindo tabela no oracle
 
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Esse vídeo ensina como excluir uma tabela no oracle.
Views: 218 welton Silva