alter table drop column

Similar Questions

• Estimating redo size of alter table DROP COLUMNS CONTINUE checkpoint of 10000

  Hello
  in my 10.2.0.3, I've got table size 90 GB suffering:
  ORA-12986: columns in partially suspended state. Propose to ALTER TABLE DROP COLUMNS CONTINUE
  I need to know how to estimate the size of redo of the:
  change the control of MORE of COLUMNS DROP table 10000 point.
  Is 2 x good estimate of table size?
  Kind regards.
  Greg

  GregG says:
  Please clarify for me how are distinguished between nitrifiants delay block trial and lower real column continue the process.
  Looks like DBC process will increment statistics such as:

  drain plug - number of calls ktugct
  gullies only - consistent read gets

  It's a good indicator, even if I think the specific statistics could be:

      commit txn count during cleanout
  

  I think it's one that tells you that you have made a change of "validation of transaction" to a block.

  I don't know why the CBD process is such redo intensive, is not on the update of ITL bit in db blocks only?

  It updates the inputs ITL and lock bytes, and it takes only entry of redo block; the overload of the roll forward database is in the tens of bytes is small compared to the 240 bytes per row of the column to fall - but if you have a large number of blocks to go before continue it really starts to have an effect, you might be fooled.

  WARNING - I haven't checked to see if delay block drain plug behaves (or even happens) on Delete column in the way that it would perform a simple update in bulk.

  Concerning
  Jonathan Lewis

• ALTER table drop column is too slow on the big table

  Hi all
  the user has run after a command in oracle 10 G: - >
  ALTER table < table name > Delete column (< cloumn list >); table in question is of a size 41GB.
  
  the results of the command to cancel space filled.
  Tips of even trace file cancel segemnts.
  
  query failed for hours.
  Why cancel is linked to this
  and what would the resolution for this.
  
  Unused help set...
  
  
  Thanks in advance,
  Rock

  Would it be useful to assign unused columns?
  What about dbms_redefinition?

• Reclaim space after ALTER TABLE DROP PARTITION

  Hello
  
  I have a partitioned table. My requirement is to reclaim the space by dropping a partition of the table.
  
  Is it possibe to recover space for the tablespace by dropping a partition of partition table?
  
  Thank you

  Hello

  ALTER TABLE DROP PARTITION will always return the space to the storage to be reused by other segments.

  It's the ALTER TABLE TRONQUER SCORE, where you can specify DROP STORAGE or of REUSE STORAGE clause (in case of re-use, the space is not released and can be used by the new lines inserted in the same partition). The DROP STORAGE should be the default option.

  But for the fall of the score, you don't have to worry.

  Kind regards
  Martin

• Invalid procedure after alter table add &lt; column &gt;

  Hello Experts,

  I was faced with a situation where I add a column in a table that is used in a procedure, immediately after the addition of the new procedure associated with this table column becomes invalid.

  Can someone explain please know why this happens.

  Database version:-11.2.0.4.

  I was faced with a situation where I add a column in a table that is used in a procedure, immediately after the addition of the new procedure associated with this table column becomes invalid.

  Can someone explain please know why this happens.

  Yes - the Oracle documentation explains this. I found this doc with a simple search of "column, add the oracle 11g invalid procedure.

  http://docs.Oracle.com/CD/B28359_01/server.111/b28318/dependencies.htm#CHDJIIFC

  Table 6-2 , shows how objects are affected by changes to other objects upon which they depend.

  Table 6-2 operations affects this object status

  Operation	Where the status of dependent objects
  ALTERTABLEtableADDcolumn	INVALIDWhen: Uses of the object (except a view)-dependent SELECT * on table . Dependent object uses table %rowtype . Dependent object performs INSERT on table without specifying a list of columns. Dependent object references table in the query that contains a join in SQL. Dependent object references table in the query that refers to a PL/SQL variable. Otherwise, no change.

  Read the WHOLE ARTICLE and see if it does not have to explain your problem.

• ALTER Table Add column not null, no default

  I want to add two columns in a table with not null, and the default value 0 for two columns
  Can I write everything in a single statement or do I have to divide the declaration
  I tried, but didn't work
  
  ALTER table DWSODS01. DWT00301_ORD_DTL_OMS add)
  COMB_ORD_FLG NUMBER (5.0) default null, 0
  COMB_ORD_NO NUMBER (12.0)
  by default, 0 not null);
  
  How can I change the code?

  user10390682 wrote:
  OK, so if it is NOT NULL, while there should be a value.

  Yes.

  So, when I set these two columns as NOT NULL will only future data must be NON NULL.
  What of the old and present data if I defined as NOT NULL

  NOT NULL mean value of eachcolumn + line (current or future) _ must not be null. That's why always adding NOT NULL column to a non-empty table fails - the column value for existing lines will be NULL which does NOT violate the constraint nullability. If you add the NON NULL column with a default value, the column will be added and all lines existing column value will be defined by specified default (0 in your case). As a result Oracle will be able to settle forced to null for this newly added column from the value of this column in all the existing lines will be not not null (0 in your case).

  SY.

• Generate the DDL - change is a new column and I want to generate an alter table.

  All, morning
  
  I searched and searched all over the Data Modeler and I can't find this option... but I found it easily in the designer.
  I hope you can help me.
  
  V3.0.0.665 SQL Developer Data Modeler.
  
  I added a new column to a table, and when I generate the DDL I wish it were an alter table add column rather than a table to create.
  This feature is in the designer, so I think it would be in the Data Modeler.
  
  Just in case my description isn't clear, here are the high level steps, then it is clear.
  
  1 create logic model
  2. create the relational logic.
  3. create the physical relationship.
  4 generate the DDL and run in the database. At this point, I'm going to production with my system, and all right.
  5. at this point, we have an enhancement request. For the model, it will be a new column in a table.
  6. update of the logic model.
  7. relational update logic
  8 physical update of relational
  9 generate the DDL. Here, I would have generate it know that it needs to generate an alter table add column and does not create the table.
  This is something I do a lot as all my models are in production. I can't find how to do this step to get data Modeler to generate the altar.
  Designer done exceptionally well.
  
  Quite often, it is more than a single column. Changes can be many and made over time and at the time of generating the DDL you remember not every single amendment. To have the tool discover these changes for you and generate the appropriate DDL is a feature that I consider as very high.
  
  I hope that is clear and you can help me.
  
  See you soon
  Chris...

  Hi Chris,

  you need to compare your model on database - database relational model even import and use the option 'swap target' - in this case 'expressions of alter' against the database will be generated.
  You can watch demonstrations here http://www.oracle.com/technetwork/developer-tools/datamodeler/demonstrations-224554.html
  It would probably be more useful http://download.oracle.com/otn_hosted_doc/sqldev/importddl/importddl.html
  Sooner or later your changes will require the table to be recreated, and you will need to backup your data - you can consider using the 'Advanced DDL' option - script is generated that will land your table content (including LOBs) to the system of files accessible from the database and restore after changes. Well not try directly on the production system :).

  Philippe

• ALTER TABLE with the column NULL time consuming

  Hello

  I have a table with nearly 2 million documents (about 10 GB size table) when I perform the following change statement its run fast

  ALTER TABLE tbl_1 ADD (DEFAULT col_4 NUMBER 100 NOT NULL);

  but when I do not give the NOT NULL in the alter its taking a long time to complete this i.e tbl_1 of ALTER TABLE ADD (NUMBER col_4 by DEFAULT 100); once I do the column as NOT NULL.

  Can someone explain why is it happening like that regarding the execution point.

  Thanks in advance.

  I can reproduce the effect in 11.2.0.1 - but not in 12.1.0.1.

  drop table tbl_1;

  create table tbl_1

  as

  Select rownum id

  , lpad ('* ', 50,' *') padding

  of the double

  connect by level<=>

  ALTER TABLE tbl_1 ADD (NUMBER col_4 by DEFAULT 100);

  --> slow in 11.2.0.1; fast 12.1.0.1

  ALTER TABLE tbl_1 ADD (DEFAULT col_4 NUMBER 100 NOT NULL);

  --> Quick 11.2.0.1 and 12.1.0.1

  A SQL trace for two operations (11g) shows that the altar slow (without the constraint explicit non-null) made explicit (and tedious) update of any row in the table:

  Update 'TBL_1"set"COL_4"= 100

  call the query of disc elapsed to cpu count current lines

  ------- ------  -------- ---------- ---------- ---------- ----------  ----------

  Parse        1      0.00       0.02          0          1          0           0

  Run 1 11,63 33.56 8336 1016125 2053531 1000000

  Fetch        0      0.00       0.00          0          0          0           0

  ------- ------  -------- ---------- ---------- ---------- ----------  ----------

  Total 2 11,63 33,58 8336 1016126 2053531 1000000

  The other trace file does not contain the explicit Update. I guess in the optimized case that oracle stores somewhere that col_4 has the value 100 and updates only the line of the block after completing DML operations. But that's just a guess.

• ORA-14452 attempts to create, alter or drop an index on a table temporary alr

  I'm trying to edit a column in my global temporary table.
  When I try to run the query, I get this error...
  ORA-14452: try to create, alter or drop an index on a temporary table already in use
  
  It is the solution that I found in google.
  Action: All sessions using the session-specific temporary table must truncate table and all transactions using the specific temporary table have to end their operations in transaction.
  
  How can I make sure that the transaction is complete
  or what is the best way to solve this problem?
  
  Thank you

  Tell everyone to disconnect from the database. If they won't come out and it is a change of mission critical and killing their session will have undesirable consequences for the data, and then kill their sessions. Hell you could bounce back just the database, that everyone will come out and then don't open it back to connections non s/n until your done with your DOF on the TWG. Of course, you probably want to do during a scheduled maintenance window if it is a production environment because it tends to make people grumpy when you surreptitiously gives them the boot.

  Depends on the importance, it's to make the change, on the other hand, the importance is keeping your DB online and/or your connected users.

• ALTER TABLE hf_altertest ADD COLUMN does not

  I am using ORACLE 11g and my FDI is Developer SQL 4.1.1

  It's all free PC version that has limits.

  I tried on:

  CREATE TABLE hf_altertest

  (

  contact_id INTEGER NOT NULL

  , name VARCHAR (25)

  , last_name VARCHAR (35)

  PRIMARY KEY (contact_id)

  );

  ALTER TABLE hf_altertest State to add a CHAR (2) COLUMN;

  But when I go to run the ALTER TABLE statement then I get following error:

  rror starting at line: 1 323 in command.

  ALTER TABLE hf_altertest State to add a CHAR (2) COLUMN

  Error report-

  SQL error: ORA-00904: invalid identifier

  00904, 00000 - '% s: invalid identifier '.

  * Cause:

  * Action:

  I can run the same code in MySQL without error.

  This leads me to think that maybe I'm just bumping into a limit in the free version of PC.

  Any thoughts?

  3003916 wrote:

  I am using ORACLE 11g and my FDI is Developer SQL 4.1.1

  It's all free PC version that has limits.

  ALTER TABLE hf_altertest State to add a CHAR (2) COLUMN;

  But when I go to run the ALTER TABLE statement then I get following error:

  rror starting at line: 1 323 in command.

  ALTER TABLE hf_altertest State to add a CHAR (2) COLUMN

  Error report-

  SQL error: ORA-00904: invalid identifier

  00904, 00000 - '% s: invalid identifier '.

  * Cause:

  * Action:

  I can run the same code in MySQL without error.

  This leads me to think that maybe I'm just bumping into a limit in the free version of PC.

  Any thoughts?

  There is no LIMIT to the 'free' version  If you read the error message he said THAT was not a valid identifier.  Just to show you that I tried your erroneous statement

  ALTER TABLE hf_altertest ADD COLUMN state2 CHAR(2);
  

  and here is the indicator error message in SQL +.

  SQL * more: Production of liberation 12.1.0.2.0 Tue Oct 15 14:34:57 2015

  Copyright (c) 1982, 2014, Oracle.  All rights reserved.

  Connected to:

  Oracle Database 11 g Enterprise Edition Release 11.2.0.4.0 - 64 bit Production

  With the partitioning, Real Application Clusters, Automatic Storage Management, OLAP

  and Data Mining options

  Add a COLUMN state2 TANK (2)

  *

  ERROR on line 2:

  ORA-00904: invalid identifier

  As you can see (and as the previous poster of response indicates), the 'COLUMN' KEYWORD is not necessary when adding new columns.  Only when 'RENAME' is used, then you add the keyword COLUMN.

  See the documentation for the syntax of ALTER TABLE here--> http://docs.oracle.com/database/121/SQLRF/statements_3001.htm#SQLRF01001

  See specific clause RENAME syntax here--> http://docs.oracle.com/database/121/SQLRF/statements_3001.htm#i2183480

• ALTER table - column required

  Hey guys, quick question. I have a table that is created and that you just want to make one of the columns is required. What is this done by following these steps:
  
  ALTER TABLE < my_table >
  ALTER COLUMN < my_column > MANDATORY
  
  If this isn't the case, could someone guide me on how to do it.
  
  Thank you.

  ALTER TABLE CHANGE NOT NULL;

• Quick question: alter table, alter column NOT NULL...

  Hey all,.
  
  If I change 3 populated (they have data) columns in a table with about 300 million of NULL lines that is NOT NULL:
  
  alter table blah
  change (col1, col2, col3 NOT NULL NOT NULL, NOT NULL);
  
  ... about cela "will take a long time?
  
  I know that it is a question REALLY of high level, but I wonder how long it should consume (a few minutes or several minutes - looking for an approximate answer as well). The table has 10 columns, if that helps.
  
  Hardware specifications are not relevant... I am looking for a basic response.

  Hello

  Plug material is relevant here.
  It depends on the material/Oracle parameters/IO etc..
  You can also view v$ session_longops to track progress.

  Concerning
  Anurag Tibrewal

• Drop columns and how to add them in the same position

  Hello
  
  My requirement is I want to delete columns in existing table and later, when I want to add these columns to the same position.
  
  (1) create table t_emp
  
  create table t_emp)
  EmpNo varchar2 (10) primary key,.
  Ename varchar2 (100),
  desig varchar2 (100),
  VARCHAR2 (100) Dept.
  number (10,2)) of salary;
  
  (2) a fall the columns below.
  
  ALTER table t_emp
  drop (desig, dept);
  
  (3) add these columns.
  
  ALTER table t_emp
  Add (desig varchar2 (100),)
  VARCHAR2 (100)) Dept
  
  (4) desc t_emp
  
  Now the order of the columns is changed, I want to bring to the initial position of columns, that is
  
  EmpNo, ename, desig, dept, salary
  
  I'm trying through some work around this, such as the use of a table of permutation. Please share your knowledge and what would be the apt method.
  
  Thank you.

  845956 wrote:
  Hello

  My requirement is I want to delete columns in existing table and later, when I want to add these columns to the same position.

  (1) create table t_emp

  create table t_emp)
  EmpNo varchar2 (10) primary key,.
  Ename varchar2 (100),
  desig varchar2 (100),
  VARCHAR2 (100) Dept.
  number (10,2)) of salary;

  (2) a fall the columns below.

  ALTER table t_emp
  drop (desig, dept);

  (3) add these columns.

  ALTER table t_emp
  Add (desig varchar2 (100),)
  VARCHAR2 (100)) Dept

  (4) desc t_emp

  Now the order of the columns is changed, I want to bring to the initial position of columns, that is

  EmpNo, ename, desig, dept, salary

  I'm trying through some work around this, such as the use of a table of permutation. Please share your knowledge and what would be the apt method.

  Thank you.

  column order does NOT elements.
  If you insist blindly, then create new table with columns ordered you want
  then move the data to the new table & finally to rename the tables.

• Online syntax to create Foreign key with Alter Table statement

  I am a pretty meticulous reader. That being said, from the 4 texts that I read to start to learn SQL, I do not remember and do more that probably not, find a syntax online for the creation of a CF with the statement alter table.

  Just something I thought while I was reading.

  Is there a such syntax?

  And if so someone can give me direction on my code?

  ALTER table emp4 change employee_id key foreign employees of references (employe_id);

  It gives me the option error invalid alter table.

  Any idea would be appreciated.

  Thank you.

  rp0428 wrote:

  A foreign key is a constraint, you must use ADD CONSTRAINT.

  Thare is more than one way to skin a cat:

  SQL > create table tbl (id number, name varchar2 (10))
  2.

  Table created.

  SQL > alter table tbl adds (foreign key references emp (empno))
  2.

  Modified table.

  SQL > select constraint_name,.
  2 constraint_type
  3 from user_constraints
  4 where table_name = 'TBL '.
  5.

  CONSTRAINT_NAME C
  ------------------------------ -
  SYS_C0021920 R

  SQL > drop table tbl purge
  2.

  Deleted table.

  SQL > create table tbl (id number, name varchar2 (10))
  2.

  Table created.

  SQL > alter table tbl change (foreign key references emp (empno))
  2.

  Modified table.

  SQL > select constraint_name,.
  2 constraint_type
  3 from user_constraints
  4 where table_name = 'TBL '.
  5.

  CONSTRAINT_NAME C
  ------------------------------ -
  SYS_C0021921 R

  SQL >

  SY.

• ALTER table add constraint vs alter table change

  Hello

  could someone explain why we have two different statements when you add a constraint on an existing table?

  If I need to add a primary key constraint to a column from an existing table that I use:

  ALTER table tab1 add the key primary constraint tab1_id_cst (id)

  But if I want to add a NOT NULL constraint, the same syntax does not work, I need to use alter table change instead

  Why?

  Thank you!

  Hello

  The constraint not null is a constraint inline, average, it applies to the column level. So in order to change anything at the column level you must use "ALTER TABLE CHANGE" only.

  Remaining constraint is forced to outline, which are part of the table definition. The table definition can be modified by "ALTER TABLE... ADD '.

  In the framework of the above mentioned constraints, those are the two columns level constraints and table except constraint NOT NULL value. Change column level, you must use the syntax

  and for the level of the table, you need to use the respective syntax.

  Kind regards

  Bigot