I am using Oracle 11g and Toad for Oracle. How can I display execution plan for queries?
In Sql server management studio execution plan can be displayed as graphical format. Is there any functionality/tool like that on Toad for oracle?
CTRL-E
Make sure you've ended the query with a semi-colon (and the query above)
Edit:
You need to set-up the TOAD plan table for use. If you think it's already setup on your DB then you may just need to be granted access. Alternatively in my slightly older version of TOAD it's under:
Database --> Administer --> Server Side Objects Wizard. From here you can create the plan table(s) in a schema that you choose.
You should create the PLAN_TABLE using a script provided by Oracle
which is named UTLXPLAN.SQL and is located in one of the installation folders
on the database server.
Then, you should use the EXPLAIN PLAN statement for generating a plan for a SQL statement, like this:
EXPLAIN PLAN SET STATEMENT_ID = 'your_identifier_for_this_plan'
FOR
... your statement ... ;
Then, you can use either a select from PLAN_TABLE (usually using a hierarchical query) or the DBMS_XPLAN.DISPLAY_PLAN procedure to display the plan.
In the same folder where the UTLXPLAN.SQL file is located, there usually exist
examples of using this procedure.
Also, in SQL*PLUS you can use the SET AUTOTRACE feature.
For TOAD FOR ORACLE
this helped me How do I view the Explain Plan in Oracle Sql developer?, I just write what they did in sql developer and wrote in the toad editor and then execute.
Example
explain plan for select field1, field2 from TABLE_NAME;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
Check that all queries end with a semicolon, put the cursor on the query you want to analyze and hit CTRL-E.
The first time you could get a popup that asks for the name of the plan table, it suggests TOAD_PLAN_TABLE but it's better to use the standard Oracle table PLAN_TABLE that should be already available. So enter PLAN_TABLE in place of TOAD_PLAN_TABLE (do not specify a schema) and hit OK. You should get a message saying that the object already exists: hit OK again to acknowledge it. Now try CTRL-E again and you'll get the explain plan.
To view/change the currently configured plan table name go to menu "View / Toad Options / Oracle General".
Related
I'm trying to find all (available) SQL history by user in our Oracle 11g database. I've tried using some view such as v$sql_monitor, v$sqlarea, and dba_hist_active_sess_history to try to get usernames, and their executed SQL statements (joined on SID and Serial #) but I'm not having any luck. Our senior DBA and DBE said they've done it before but just told me to look in sqlarea since that has the longest history of SQL held. I'm not having any luck with this. Is this possible to do in Oracle?
Edit: We use SQL Developer. I understand that TOAD may or may not have this feature built-in but I haven't been able to find anything that accomplishes this (other than view current sessions and current SQL) in SQL Developer.
You can try something like that if you have the proper licensing to query dba_hist_active_sess_history, you need a license for the diagnostic pack:
select trunc(hist.sample_time,'DD'),u.name,hist.sql_id,sql.sql_text
from dba_hist_active_sess_history hist,
dba_hist_sqltext sql,
user$ u
where hist.sql_id = sql.sql_id
and hist.user_id = u.user#;
I think the only way to fetch the exact SQL-Executions of a User (i think you mean Session?) is by enabeling Tracing.
I think this article (https://oracle-base.com/articles/misc/sql-trace-10046-trcsess-and-tkprof) gives you a good instruction how it is used.
I have created a temporary table in oracle sql developer but I forgot to save it and now I want to reuse the query but I don't remember the code used then. Is there a process to get query used creation of temp table?
You can use dbms_metadata.get_ddl()
select dbms_metadata.get_ddl('TABLE', 'YOUR_TABLE_NAME_HERE')
from dual;
The result is a CLOB with the complete DDL. You might need to adjust the display in SQL Developer to make the content of that value fully visible (I don't use SQL Developer, so I don't know if that is necessary and if so, what you would need to do)
Edit:
It seems SQL Developer can't display the result of this query properly unless you use the "Run Script" option. And with that you need to use a SET LONG 60000 (or some other big number) before you run it, to see the complete source code:
I am using oracle client 11.2.0
Dll version 4.112.3.0
We have a page in our application where people can give a sql statement and retreive results. basically do an oracle command.executereader
Recently one of my team members gave an update statement as a test and it actually performed an update on a record!!!!
Anyone who has encountered this?
Regards
Sid.
It is a normal (albeit a bit unsettling) behavior. ExecuteReader is expected to execute the sql command provided as CommandText and build a DbDataReader that you use to loop over the results.
If the command doesn't return any row to read is not something that the reader should prevent in any case. And so it is not expected that it checks if your command is really a SELECT statement.
Think for example if you pass a stored procedure name or if you have multiple sql batch to execute. (INSERT followed by a SELECT)
I think that the biggest problem here is the fact that you allow an arbitrary sql command typed by your users to reach the database engine. A very big hole in security. You should, at least, execute some analysis on the query text before submitting the code to the database engine.
I agree with Steve. Your reader will execute any command, and might get a bit confused if it's not a select and doesn't return a result set.
To prevent people from modifying anything, create a new user, grant select only (no update, no delete, no insert) on your tables to that user (grant select on tablename to seconduser). Then, log in as seconduser, and, create synonyms for your tables (create synonym tablename for realowner.tablename). Have your application use the seconduser when connecting to the DB. This should prevent people from "hacking" your site. If you want to be of the safe side, grant no permissions but create session to the second user to prevent him from creating tables, dropping your views and similar stuff (I'd guess your executereader won't allow DDL, but test it to make sure).
I have an Oracle 10G database and I need to write a fairly straightforward query that joins two tables and selects some data. However, I'd like to export the result list to an excel, so end users can use this .xls document to see the results and filter by one of the fields (location)
When I write the query, is there an easy way I can generate/ create an excel document that would hold these results as described above? The SQL doesn't need to run from within excel, but I guess that would be a useful feature now that I think about it!
Thanks.
There is simple solution for your request.
By using ora_excel, small pl/sql package which generates Excel xlsx file, you can select data and export selected data to Excel and set filtering.
Please see following example:
BEGIN
ORA_EXCEL.new_document;
ORA_EXCEL.add_sheet('My sheet');
ORA_EXCEL.query_to_sheet('select * from employees'); -- Select data from database
ORA_EXCEL.set_cells_filter('A1', 'K1'); -- Add cell filtering from column A1 to column K1
-- Save generated Excel to file with name example.xlsx to Oracle folder EXAMPLE_XLSX
ORA_EXCEL.save_to_file('EXPORT_DIR', 'example.xlsx');
END;
For more details please check here
Cheers
Pretty easy to do in excel; and when done user can right click the data and say "Refresh" to get the latest updates.
but why reinvent the wheel lots of online articles already explain how to do this... Here's one
http://blog.mclaughlinsoftware.com/microsoft-excel/how-to-query-oracle-from-excel-2007/
After you've connected to a table, you can edit the properties on the connection and enter custom SQL (copy and paste from your developer tools)
Since you cannot use OLE DB in your version of Excel. Use SPOOL to create a CSV file.
SQL> SET echo off
SQL> SET verify off
SQL> SET colsep ,
SQL> SET pagesize 0
SQL> SET trimspool on
SQL> SET feedback off
SQL> SPOOL ON
SQL> SPOOL C:\data.csv
SQL> SELECT COLUMN1,COLUMN2,COLUMN3....
FROM TABLE;
SQL> SPOOL OFF
The .csv file should open in Excel by default. Use proper column aliases so that users understand the column headers.
Quick way:
At first create a view which contains your Query(Best way because you might need to change this query later).
Be sure to properly have installed oracle client.
In Excel(2007 and above) in Data tab go this way:
From Other sources -> From Data Connection Wizard -> Microsoft Data Access - OLE DB Provider for Oracle
Now Enter your DataSource Name(Stored in tnsnames.ora) and user password
Find you view and Then You'll have what you need.
You can save password and set option to refresh automatically in connection properties.
You are able to query an oracle database directly from Excel 2003 however, your sql statements are interpreted by MS Query and because of this it can often be frustrating. I will assume the machine in question already has the ability to query your database and has properly configured the database naming.
To query your database from excel 2003 you must:
Install and configure oracle's ODBC Driver (You must have the 32bit drivers installed since excel03 is a 32bit application). ODBC can be configured under start > administrative tools > ODBC Data Source Administrator
Open excel 2003 and goto data > import external data > new database query.
This should bring up MS Query which is an Access-like interface.
Obviously this is a very brief starter to get you stepping in the right direction. If you have any specific questions, please comment and I will try and help you.
Step 1
Run Your Query
Right Click on Resultenter image description here
Step 2
Click on Export
enter image description here
Step 3
Select Format To Excel
Enter datasheet name and location
Step 4
Click on Next and then finish
enter image description here
You can do one thing.
First generate the output in a form that includes column separators using symbols (like , or #).
Import the data to the excel and then define the placeholders as the column separators.
Here is my problem, I wants to create a baseline on our development Dateabase (Oracle 10g), and check into our svn for version control, and after this we will use liquibase to help us manage the incremental database changes.
My problem is how should I create baseline of Oracle 10g? the database now consists of 500+ tables, with large amount of configuration data, and I wants my db baseline to base on a set SQL scripts to check into subversion, rather then check in Oracle dump..
I have try use liquibase generateChangeLog, but it have some performance problem.. can anyone can recommends me any tools that will help me
1. Scan any Oracle Schema
2. Generate a set of SQL Scripts (With Table structures, and Data)..
Thanks in advance
James!
Something like
SELECT DBMS_METADATA.GET_DDL('TABLE',table_name) FROM USER_TABLES;
is a good start. You can tweak it with PL/SQL and UTL_FILE to get it to write each table to a different file. You will probably need to do sequences too (though versioning them is fairly pointless), and maybe triggers/procedures/functions/packages etc.
Don't forget grants.
Have you tried Oracle's free SQLDeveloper tool? It gives you the possibility of exporting DDL and data.
EXPDP with CONTENT=METADATA_ONLY option, then IMPDP with SQLFILE=your_script.sql ?
Nicolas.
More general solution would be to dump DDL sql for selected list of tables, but additionally also other types of objects. This could be done by using all_objects and all_users views.
Example that worked for me:
select dbms_metadata.GET_DDL(u.object_type,u.object_name, u.owner)
from all_objects u
where 1=1
-- filter only selected object types
and u.object_type in ('TABLE', 'INDEX', 'FUNCTION', 'PROCEDURE', 'VIEW',
'TYPE', 'TRIGGER', 'SEQUENCE')
-- don't want system objects, generated, temp, invalid etc.
and u.object_name not like 'SYS_%'
and temporary!='Y'
and generated!='Y'
and status!='INVALID'
and u.object_name not like 'TMP_%'
and u.object_name not like '%$%'
-- if you want to filter only changed from some date/timestamp:
-- and u.last_ddl_time > '2014-04-02'
-- filter by owner
and owner in (
select username from dba_USERS where DEFAULT_TABLESPACE not like 'SYS%'
and username not in ('ORACLE_OCM')
and username not like '%$%'
)
;
I wrote a python script that refreshes db schema in incremental mode based on similar sql:
runs sql with last_ddl_time>=max(last_ddl_time from last refresh)
at the end stores last_ddl_time somewhere in filesystem for next refresh
References:
oracle dbms_metadata.GET_DDL function
oracle all_objects view