I have a set of rows based on a complex view from multiple table.
I will be updating some of its columns from front-end . Is there any possible ways to lock those rows of data while updating and no other users can update it;
I've got a Source Data in complex relational formFor reporting purposes, a simpler, less normalized data model is neededThere are two Target views from the Source Data: one of them with full access to all datathe second one with access only to a subset of the data (same columns, but not all the records)For both target groups, a separate schema shall be available, each containing only relevant dataToday, these schemas are physically located on the same DB instance and host as the source dataA daily refresh is sufficientA later relocation of the reporting schemes to other DB instances shall be possible without major changes neededOracle 10g should be used I tried to accomplish this using Materialized Views (Materialized seems better since there will be sometime a need to have all the apropriate data somewhere else, geographically, AND it provides Complete Refresh from the Source), but there is a problem: when creating the MV there is a possibility to type 'SELECT *' - but after execution it changes into real columns names. It is important because later after adding a new column into Source Data it WILL NOT appear in MV after refresh.
I also thought about Data Guard, Streams and RAC, but I think only in the Materialized Views you may choose the data to show (rows, columns).
I have a select statement that selects all columns from the join of 3 oracle views. I would like to change it to select only the distinct rows, not sure how to code this. Here is my sql statement:
select *
from myschema.view_1 acct
Left JOIN myschema.view_2 freq
[Code].....
I have a "select ... into" in my PL/SQL and it doesn't retreive any data(I suppose just certain columns because if it doesn't retreive a row then the PL/SQL should throw an error) when there are many users accessing this table. It shouldn't be some table locking right? Because if it is, it should wait until the table is available then it will retreive data. Currently it just proceeds with the PL/SQL and selecting nothing in that query. what details should I look at to trace the cause of this problem.
View 4 Replies View RelatedI have a table structure as follows
Student(Id,First_Name, Last_Name, email, Contact, Address1,Address2,City,Edit_Date,Create_Date,Archived)
Now if there is more than one row with same email the one with the latest edit date should be updated with missing fields by using same field value other rows (if the field is present in more than one row, the one with the next latest edit date is to be considered) and the archived status of all rows with same email except this master row must be set to 1.
The Create_Date must be set to the minimum of all the create_date values of rows with same email value The create table would be as follows:
CREATE TABLE student(Id NUMBER PRIMARY KEY,first_name VARCHAR2(30) NOT NULL,last_name VARCHAR2(30) NOT NULL,email VARCHAR2(30) NOT NULL,contact NUMBER,adress1 VARCHAR(30),adress2 VARCHAR(30),city VARCHAR(30),edit_date DATE,create_date DATE,archived CHAR(1))
Sample insert statements would be: insert into student values
I have a table which has plenty of rows. In production, I would estimate it to be from 30 millions to 300 millions. I need to update on column (flag) in all the rows (created before certain date).Now saying just:
UPDATE MyTable SET flag = 3 WHERE created < to_date('2010-10-08 23:59:59', 'YY-MM-DD HH24:MI:SS');
COMMIT;
Does not seem like a good idea - the commit-buffer would become too big.I will write a PL/SQL script for this. The question is, whether I should:
a) Update each row separately, and commit after every 10000 rows. ( WHERE RowId = [rowId] )
b) Update 10000 rows with set of dates ( WHERE rowId > [some_row_id] AND RowId < [some_row_id_2]
In the latter example the some_row_ids would naturally be fetched. The rowIds come from sequence. So which one would be more effective?I am not too familiar with PL/SQL or Oracle for that matter.
I have a table A, whose table structure is in the below format.
Table A
ID DESC VALUE
123 A 454
123 B 1111
123 C 111
123 D 222
124 A 123
124 B 1
124 C 111
124 D 44
Now i need to insert the data from this table to another table B, the sturcture of which is as below
Table B
ID A B C D
1234541111111222
124123111144
How do i frame a query to fetch data from table A and insert that into table B? I don't want to use max and decode combination. as it would return only single row for an ID. I need all the id's to be displayed.
I need to find the identical rows in the below table based on ID column and update the previous identical record's end_date with latest record's start_date-1.
"ID" "NAME" "START_DATE" "END_DATE"
1 "a" 05-MAR-10 31-DEC-99
1 "B" 30-MAY-12 31-DEC-99
1 "C" 30-MAY-13 31-DEC-99
2 "A" 02-APR-10 31-DEC-99
2 "B" 02-APR-10 31-DEC-99
2 "C" 30-MAY-12 31-DEC-99
3 "C" 04-MAR-10 31-DEC-99
Result should be like below format..
"ID" "NAME" "START_DATE" "END_DATE"
1 "a" 05-MAR-10 29-MAY-12
1 "B" 30-MAY-12 29-MAY-13
1 "C" 30-MAY-13 31-DEC-99
2 "A" 02-APR-10 01-APR-10
2 "B" 02-APR-10 29-MAY-12
2 "C" 30-MAY-12 31-DEC-99
3 "C" 04-MAR-10 31-DEC-99
The requirement I have is :
I have two tables eim_asset and eim_asset1.I want to update the table eim_asset1 using the following update SQL (Or Logic)
update eim_asset1
set emp_emp_login = (select login from s_user where row_id in
(select row_id from s_emp_per where row_id in
(select pr_emp_id from s_postn where row_id in
(select position_id from s_accnt_postn where ou_ext_id in
(select row_id from s_org_ext where row_id in
(select owner_accnt_id from s_asset where owner_accnt_id is not null)))))
It gives me the ORA error : ORA-01427:single-row subquery returns more than one row.know why I am getting it, because of the one-to-many relationship between owner accounts and their assets.
create table temp_tst
(
FILENAME VARCHAR2(200),
EDITED_BY VARCHAR2(50),
EDITED_TO VARCHAR2(50)
)
[code]....
Can I write a single update statement to update filename column replacing "_tst" with "_check"?
At the moment, we were loading the file in our system serially. This is a very old and established system.We would like to incorporate parallel loading for our loaders to load data into the database.
Most of the issues would be due to multiple inserts happening due to the files being loaded in parallel. For some reasons, we cannot give regular commits untill the entire batch of items is processed in case the process needs to rollback. A file can contain different set of batch of items clubbed together for loading.
The issue here is untill the first file finishes loading and commits, the second file would just hang. In fact, mulitiple files might hang for the first file to finish. what can I do to overcome this?I tried to used "lock table t1 in SHARE ROW EXCLUSIVE mode nowait". When the leading process is doing inserts, the failing process will fail with a resource busy and acquire with NOWAIT specified. We would catch this exception and redirect that batch to an error file to be reloaded at a later date.
I am trying to update the security_level of a mission to the highest security level of missions of the same type.
Attributes of the missions table:
mission_id, code_name, mission_type_id, mission_date, security_level
The following is an intermediate output.
MISSION_ID MISSION_TYPE_ID SECURITY_LEVEL
318 3 6
329 3 2
286 5 6
521 5 3
281 6 4
396 7 3
331 8 4
14 9 4
230 9 0
486 10 2
The maximum output for each mission_type_id
MAX_LEVEL TYPE
6 3
6 5
4 6
3 7
4 8
4 9
2 10
According to this 3 records (329,521 and 230) should update.
But my code returns an error.
ERROR at line 4:
cannot update (......"SECURITY_LEVEL") to NULL
this is my code
UPDATE
AM_X_442_2 amx
SET
Amx.SECURITY_LEVEL =
(
select
max_level
[code].........
I have intended the query to make it legible but it removes all spaces.
is there some open source or free tool which can graphical display V$ Views. Can TOAD do that in a good maner?
in UNIX there is the "sar" command, but a Java tool "ksar" for displaying the statistics in user friendly fashion.
I have a created a materialized view which is based on a view on remote database. Now how do I refresh the view.
Materialized view is created by
CREATE MATERIALIZED VIEW mv_employee_name
AS SELECT EMPLID, EMPL_NAME
FROM VEMPDATA@REMOTEDB
WHERE REGION = 'US';
I am wondering how the refersh happens or how do I specify the refresh clause.REFRESH FAST option is looking for VIEW LOG on the master table but in this case its a remote view, so I cannot create any object on remote db.
I am removing sal column from table tab_emp; i want to check whether any materialized view or view using this column by querying using data dictionary :- if i use like condition against query column of all_mviews it is throwing error sicne it is long data type. is there a way to search it without creating any function and use it in a query.
View 3 Replies View RelatedI am using oracle 8i and need to read data from teradata using public link and views.
View 4 Replies View RelatedOracle version : 11.2.0.3
Some DBA_views are huge with lots of columns ; a DESC command's output becomes less readable ; example DESC command's output of V$SESSION view.
Lets say I want to see only the date columns in a DBA_view or V$view ; How can I do that in a DESC like output or similair ?
I have 3 reporting tables with 2.2 million records each being rebuilt nightly. The data is used online 24/7 by users and thus, snapshot tables are being built from the refreshed reporting tables. The current method to do this:
delete from snapshot table;
insert into snapshot table (select * from report table);
<repeat for other 2 tables>
commit;
This seems to me to be resource intense on the system even though the table is defined with nologging option.
Is it better to create a MV (select only with refresh complete on demand)? The query is very simple without joins so it at first seems like overkill. However, I am also seeing that dbms_mview.refresh allows for an atomic option. Thus, if 1 of the 3 MVs fails during refresh all 3 rollback, which is a nice feature.
Are there better ways to replicate a snapshot table that I've missed? Is a delete and insert strategy a bad idea?
UPDATE PMAPS_Z_DEMAND_MASTER_DATA_TMP C
SET PACKAGE_NAME =
(SELECT DISTINCT
A.PACKAGE
[Code]...
i wanted to update data in PMAPS_Z_DEMAND_MASTER_DATA_TMP table but i kept getting "more than 1 value returned in sub query" error, i know what it is but i don't know why it is happening here.
I have been using MSaccess to do some updating and deleting of data.I have 2 tables, 1 with data, 1 with the criteria to change, 2 colums (FINDWORD and REPLACEWORD).
The main table has lots of data, and the SQL query im using in access looks like this:
UPDATE TABLE1, tblFindReplaceWords SET CleanList.COLUMN-NAME = Replace([TABLE1].[COLUMN-NAME],[tblFindReplaceWords].[FINDWORD],[tblFindReplaceWords].[REPLACEWORD]);
how would I go about doing the same thing in orcale?
Is it possible to create trigger on the various tables and views exists (i.e. dynamic performance views) in data dictionary, when ever any DML operations performs by Oracle it self?
View 6 Replies View RelatedI have a task to update one of the rows in a table (having only 2 columns, number and long) which is long data type. We are on Oracle 10g. Not sure how to use update for a long data type column.
I have tried using dbms_metadata_util.long2varchar, but still not getting what I want.
I have to convert some existing materialized views (fast refresh) to partition materialized views.
Database version is oracle 10.1.0.4. I have decided to use on prebuilt table option to do the partitioning as it minimizes the time to transfer from the master site.
1) stop replication
1) create interim tables with similar structure as the materialized views
2) transfer all data from the materialized views to the interim tables
4) script out the materialized views structure and add in on prebuilt table option in the scripts
5) drop the materialized views
6) rename the interim tables with the same name as the materialized views
7) run the scripts to create the materialized views with on prebuilt table option
8) refresh the newly created materialized views -> it should take a short time since I am using on prebuilt table option
But I am facing one major issue. That is if I drop the materialized views, the materialized view logs of the master tables are purged. When the materialized views are refreshed fast, there are some data missing. the data that are purged out when the materialized view are dropped.
Do you happen to know other ways that existing materialized views can be converted to partitioned materialized views? Do you have any workaround to prevent the materialized view logs from being purged?
i want to insert some data in the transactions table on after insert trigger. Which trigger should i use on form level to accomplish this task.
View 4 Replies View RelatedI have 2 tables
Table 1Name Item DateJon Apples 06/11/2013 00:30:00 hrsSam OrangesNish Apples
Table 2 - Net countName Item CountNish Apples 10Nish Oranges 17Nish BananaSam Apples 10Sam Oranges 1Sam Bananas 1Jon Apples 8
I need to create a job that checks Table 1 for new records added after last run and then add the count in Table 2 accordingly.how to achieve this using PL/SQl or something similar
I am using:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0
Microsoft Visual Studio 2010 : VB Express
Microsoft .NET Framework : Version 4.0.30319 RTMRel
When I populate dataset using select query and use OracleCommandBuilder and update dataadapter, data is saved in database.
But if I put same select in store procedure and use this to populate dataset then data is not updated in db.
I get this error
Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
at da1.Update(ds1, "req") where I am going wrong.
Dim conn As New OracleConnection
Dim da1 As OracleDataAdapter = New OracleDataAdapter
Dim ds1 = New DataSet
With conn
If .State = ConnectionState.Open Then .Close()
[Code]....
I am facing the row lock issue in production. I have been trying to resolve the issue but i coud'nt. I traced out by using different queries which sql query is locking which but everything looks good.
And i also checked for connections open and close everything is in good place but unable to resolve the issue. we are running a batch file which runs in every night some of the records are processing and if any one record is failed it is blocking another records.My oracle version is oracle 10.2.0
I want to Who is locking the table by an SQL statement
View 32 Replies View RelatedSay we have an employee(id_emp) table with a primary key on id_emp. We have also some history tables emp_stuff with columns say (id_emp, dat_event, some_stuff) with primary key id_emp, dat_event.
This means that we have a unique index on (id_emp,dat_event). We also have a foreign key id_emp that references employee(id_emp). When we update id_emp on employee, we still have a lock on emp_stuff. According to this (end of the page) :
Quote:So, in short, with releases prior to Oracle Database 11g Release 1, you will want an index on the foreign key of the child table if you do any of the following:
Update the parent table primary key
Delete from the parent table
Merge into the parent table
So is id_emp in emp_stuff considered as indexed (through the unique index of the primary key) or do we have to add an explicit index
like this CREATE INDEX emp_stuff ON emp_stuff(id_emp) to avoide child table locks?
I have developed a form, containing 5 tab pages and also referencing to 5 tables.tab page a of table a some fields are required and some or not.when i open form and start entering record, and then i change mine and dont enter and want to navigate to some other page, it simply allows me to leave it blank and move to some other tab page.
tab page b of table bsome fields are required and some or not.when i open this tab page and one i click in the first field and then do not enter anything in it and want to leave it , it does not allow me to leave blank.what could be the reason. why one tab page allow me to leave blank and navigate and why the other does not?first field of both tab pages are required.