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On Becoming Others, Limits, and Restoration. TECHNOLOGY: Ask Tom. By Tom Kyte Our technologist assumes identities, eliminates external limitations, and recovers constraints. I got handed this requirement, and I don’t think there’s a good way to solve it.

I have a user, USERA, who has some tables, data, and packages. Another user, USERB, has SELECT privileges on that data (easy enough) and the ability to make her own packages (easy enough), but the requirement is to give USERA the ability to edit USERB’s packages.

I think this is impossible without giving an ANY privilege. I think it would be best if USERA just had USERB’s password.

Is there any other solution? Whatever you do, do not give out passwords like that. You’ll never know who did what in your database. That is just asking for trouble.

You can allow A to assume B’s identity, however, but still maintain the fact that A was “being B” at that time so you can audit things and know that A acting as B performed an operation. All that is left is to give A the ability to “become B,” and I do this by using the following ALTER USER statement. SQL> alter user b 2 grant connect through a.

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User altered. I’ll demonstrate that by creating a procedure as B and then allowing A to edit it. SQL> connect b/b. Connected. Now that A is logged in as B, A can use B’s privileges to perform operations. SQL> create or replace. That might not be what was intended, and I’ll show in a moment how to prevent that.

But first let’s just verify that the code changes worked as expected. SQL> connect a/a. Connected. I like to follow the concept of “least privilege” at all times, so I want to make it so A can use B’s CREATE PROCEDURE and CREATE SESSION privileges but not the CREATE TABLE privilege. I can do this via roles. I re- create user B as follows.

SQL> create role b. Now I can grant user A the ability to connect through B with only certain roles enabled. SQL> alter user b. For more details, see bit.

Wedding Anniversary watch in english with subtitles in 1280. Ua. E6. FR. Unlimited External Tables. Can you use the SQLLDR BOUNDFILLER keyword in an external table definition?

I have data like this: . I tried creating an external table definition with a field list like this( patient. You are forgetting that with an external table, you don’t have the limits of the legacy data loading tool from the twentieth century called SQL Loader (SQLLDR). With external tables, you have all the power of the SELECT statement to do whatever you want. To demonstrate this, I’ll show you the easiest way to upgrade from SQLLDR to external tables—using SQLLDR itself. I’ll take your control file. INFILE '/home/tkyte/t.

FIELDS TERMINATED BY ','. When using FLASHBACK, I can restore a table, but how do I restore the constraints and indexes associated with this table? I can re- create the indexes and constraints, but is it possible to restore indexes and/or constraints by using Oracle Flashback technology? The indexes and constraints are actually restored by flashback, but you might not have recognized them.

They retain their recycle bin names, so their names start with BIN$ followed by seemingly random characters. They come back with the table, but their names are lost. All you need to do is rename them. For example. . Many times you can use flashback query on the data dictionary to address such issues.

To demonstrate this, I’ll create a table that I will accidentally drop in a moment (so I can then “undrop” it). SQL> create table t. I don’t need to know exactly when I dropped the table, just some time when the table existed with its indexes and constraints. I’m going to use a system change number (SCN) as the time, but you would probably use a time stamp (date and time).

I’ll save the current SCN into a variable for use later in this demonstration. SQL> column SCN new.

It supports a Web- based app, and I know that the application server connection pools are having problems, but looking at the database, I can see the number of inactive sessions get to about 6. I am looking at setting up a profile to expire inactive sessions after a while. Do you have any suggestions on how I can diagnose the blocked sessions further? Do not set up a profile to kill inactive sessions! The connection pool will have sessions in the database all the time, and many of them might be idle for a long time during periods of inactivity.

If you kill them, you’ll kill the connection pool and the application will start returning error messages about not being connected anymore (and you’ll make the problem worse). Now to the problem at hand. Your developers are leaking connections—probably connections and cursors. They have some code like this. They have an error that gets raised every now and then—just once is enough—and they fly over the release of the connection back to the pool with their flawed exception handling.

They have an outstanding transaction with locked resources associated with a connection handle they can never get access to again. To easily prove this, have the developers set their connection pool to a minimum size of 1 and a maximum size of 1 in the test/QA environment and run a full regression. If that test cannot run forever without getting stuck (without running out of connections), this bug exists in their code.

I am 1. 00 percent certain that their code will get stuck quickly. So, what I suggest is get a handle on your connection pool settings. Always set MIN and MAX to equal each other and set them to some reasonable number (never let these things grow dynamically). Watch the narrated video at bit. YQuh. B for some very compelling evidence that this is extremely important (maybe the most important thing you can do for your system’s stability).

Run the previously mentioned connection test in the dev/QA environment with a connection pool sized to one connection until it works forever. Until you get the number of connections in the connection pool under control, use Oracle Enterprise Manager to see the blocking/blocker graphs and kill sessions that are blocking other sessions and that have been idle for some period of time. That solution really stinks, but until the developers fix their very serious bug, it is “state of the art.”Don’t just kill idle sessions. They could be associated with a connection in a connection pool that just hasn’t been used in a while.

Do use Oracle Database’s Resource Manager feature to limit the number of concurrently active sessions in your system as a protection mechanism. You have 6. 00 connections—if they all become active (or try to become active), your machine will melt down, because you don’t have 6. CPU cores (and that’s a safe assumption). Limit the number of concurrently executing sessions to some reasonable number—watch that video for the reasoning behind this statement.

You probably want no more than 1. He is the author of Expert Oracle Database Architecture (Apress, 2. Effective Oracle by Design (Oracle Press, 2. Send us your comments.