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ORA0001: Database Error Code Analysis
Oracle databases have gned immense popularity in the IT industry and are widely used by businesses of all sizes. However, like any other software, Oracle databases can also experience issues and errors. One of the most common errors that Oracle database administrators encounter is the ORA0001 error code. In this article, we will yze the ORA0001 error code and discuss ways to resolve it.
What is the ORA0001 error code?
The ORA0001 error code, also known as the “unique constrnt violated” error, occurs when a user tries to insert a record into a table with a unique index or primary key column constrnt that already has the same value. Essentially, the error indicates a violation of data integrity rules that are set up by the database administrator. The error message will look something like this:
ORA-00001: unique constrnt (constrnt_name) violated
The term “constrnt_name” refers to the name of the constrnt that was violated by the insert statement.
What causes the ORA0001 error code?
The ORA0001 error code can occur due to various reasons, such as:
1. Duplicate primary keys: The primary key of the table is the column or columns that uniquely identify each row. If a user tries to insert a record with a primary key that already exists in the table, Oracle will throw the ORA0001 error.
2. Duplicate unique indexes: A unique index is a constrnt that makes sure that no two rows in the table have the same values in the indexed columns. If a user tries to insert a record with the same values as an existing record in the indexed columns, Oracle will throw the ORA0001 error.
3. Application errors: If the user’s application code is not properly handling unique constrnt errors, then it could lead to the ORA0001 error.
How to resolve the ORA0001 error code?
The process of resolving the ORA0001 error code depends on the cause of the error. Here are some ways to resolve the error code:
1. Delete the existing row: If the user wants to insert a record with the same primary key or unique index value as an existing row, the first step is to delete the existing row. This will free up the constrnt so that the new record can be inserted.
2. Update the row: If the user wants to update the row with the existing primary key or unique index value, the first step is to update the existing row instead of inserting a new one.
3. Modify the constrnt: If the user wants to insert or update a row with the same primary key or unique index value as an existing row, the database administrator can modify the constrnt to allow duplicates.
4. Handle the error in the application code: If the ORA0001 error is caused due to the application code not handling unique constrnt errors properly, the user can modify the application code to handle the error and prevent it from happening agn.
Conclusion
The ORA0001 error code is a common error encountered by Oracle database administrators when working with primary keys or unique indexes. Understanding the cause of the error and taking the necessary steps to resolve it can help database administrators mntn data integrity and ensure the ooth functioning of the database. By following the steps outlined in this article, you can effectively address and fix the ORA0001 error code.
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ORA-1110 、ORA-1122錯誤一起出現(xiàn)一般意味著對應號碼/名字的數(shù)據(jù)文件存在問題， 而更底下的錯誤號一般能揭示該問題的本質(zhì)，例如ORA-1200是說明數(shù)據(jù)文件的實際大小小于預期的大小。
針對有畝笑完整備份和歸檔的數(shù)據(jù)庫可以嘗試常規(guī)RESTORE、REOCOVER的方法來恢復該數(shù)據(jù)文件，而對于沒喲任何形式物理備份的數(shù)據(jù)庫而言，可以嘗試使用DD等手段來修改數(shù)據(jù)文件大小，并繞過該問題。 注意這樣做只是繞過問題而已，可能丟失的數(shù)據(jù)仍會丟失，并不會因此而恢復。
dd if= of= count= bs=
Taking the above example (First we take an dd backup of datafile):
dd if=/u02/oradata/careware/users01.dbf of=/tmp/corr_temp.DBF count=64000 bs=8192
Now add 1600 zero blocks to datafile /u02/oradata/careware/users01.dbf
syntax
dd if=/dev/zero of= bs= seek= count=
In parameter seek specify the block from which it should append 1600 blocks.
In this case since the file contains(as indicated by the error message) so seek=64001 which is the next block from where the append will occur.
dd if=/dev/zero of=/u02/oradata/careware/users01.dbf bs=8192 seek=64001 count=1600 conv=notrunc
Now check the file size at OS level (It should be* 8192 + 8192)bytes
Do a ls -lrt to confirm the same.
Warning!! Once the database is open, export all the objects present in the 迅陪含亂銷tablespace containing the datafile. Please note that for any segment which had blocks that got
truncated at OS level, the export may fail if it tries to read data from the zero padded blocks. In that case it may be needed to apply a procedure to salvage good records.
Once export is complete, create a new tablespace and import the data.
Once it is confirmed that the data is good, drop the old tablespace.
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詩檀軟件專業(yè)數(shù)據(jù)庫修復團隊
oracle 數(shù)據(jù)庫啟動失敗，求大神解決
datafile 5已經(jīng)損壞或丟失，如果有備份，可以通過recover datafile 5進行恢復，如果沒有備份文件，恢復會失敗，可以刪除datafile 5后，在重新啟動數(shù)據(jù)庫
startup mount
alter database datafile 5 offline drop;
alter database open;
Oracle DBA神器：PRM-DUL災難恢復工具可以直接從這種受損的Oracle數(shù)據(jù)庫中將數(shù)據(jù)拯救出來。
當你的數(shù)據(jù)庫因為ORA-00600/ORA-07445或其他ORA-報錯，或丟失關鍵的system表空間數(shù)據(jù)文件，或A diskgroup損壞時均可以考慮采用PRM-DUL來做恢復。PRM-DUL采用獨創(chuàng)的DataBridge恢復技術，直接從數(shù)據(jù)文件中抽取數(shù)據(jù)后可以像DBLINK那樣直接插入到新建數(shù)據(jù)庫中，而無需數(shù)據(jù)落地成為DMP文件占用空間。
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標題名稱：ORA0001：數(shù)據(jù)庫錯誤代碼解析(數(shù)據(jù)庫ora-0001)
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