Oracle Dump File

[Patrice Mieczkowski]

Iam thinking on what mysqldump or pg_dump are doing. So, they dump an active database into a textual file containing the SQL queries, which reproduce this whole database. In MySQL and in PostgreSQL, this is the normal database dump format.

It is a reduced developer environment of a big project (with multi-million row DB), but still having hundreds of tables and a very complex structure. And, I want to play with it fast. While I am playing with it, I also need to be able to execute tricky modifications on that. On a binary dump I can't do that, on a textual I can.

As the exact requirements are vague, I'll post this: You could also write the data you want to external tables. This would give you the data in (for example) CSV format which you could use to import using another database's import functionality.

Be aware that just getting the data as DDL/DML statements might not be enough to do what I suspect you're trying to do. There are differences in data types, lengths, formats and more which could cause problems if you're migrating from one instance type to another.

In some case tools like Flyway or Liquebase can be helpful for you, i think. Seems they can make dump in SQL, XML and maybe something else. This tools aren't very easy to use, but looks much more flexible then SQL Developer. For example if you need to filter data before uploading.

However. Would the log file and/or any internal dump file metadata, provide sufficient info to allow importing a specific single table *without* referencing all 6 dump files using impdp on the command line. Is this even a valid question to ask? In other words, is there any value in trying to identify a single constituent file for the dump of an entire schema (in my use case) when importing a single table? I'm not sure of all the details, but was asked about this and didn't know how to answer.

My suspicion is that you would, and should, specify all constituent dump files if you've got a series of files resulting from a single expdp command, using the PARALLEL switch with ...%u.dmp, when importing. But I could be wrong and often am. Thanks very much.

Hi all,

I know very little about how to use Oracle database software. I have managed to install Oracle 21c XE and create a pluggable database. Now, I intend to import a database dump that exported in Oracle 11.1g to the pluggable database. Is this possible? If yes, please give me an example of the import command to issue. Thank you.

The next leaf block in the treedump corresponds to the second block (number 0) referenced in the root block and is the second left-hand most leaf block in the index structure, followed by its specific details. The third leaf block (number 1) in the treedump is the third leaf block in the index structure and so on for all 222 leaf blocks in the index (the last leaf block numbered 220).

The RBA of any of these blocks in the treedump can be then used to determine which block of interest to block dump. The DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE and DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK functions can be used to covert the RBA into the corresponding DATAFILE ID and BLOCK ID in which to dump the block.

Thanks for this articles, I am trying to learn Index internals. I follow your stpes in my oracle database. I observed that in treedump it shows block XXX and as per index_stats it contains only one leaf block so I was expecting that block dump of XXX will show me my rows but it is not showing in that block. it must be some other leaf block. how it possible?

Some conclusions and observations so far

LZMA and LZMA2 seem to be the best options for .DMP files. I have seen other people report this too in other forums. In 7zip, LZMA only supports 2 CPU's, and LZMA2 supports more (will also use more memory). Since the compression results look identical, selecting LZMA2 should result in faster compression.

HERE is a great article I used when making a backup script on some linux machines. Worked really well. I ended up using rzip for my needs. I used it to backup and compress all types of data files including SQL database dumps.

Building on the @Wouter answer I was able to acheive a good result with the following options (approximately 3 times smaller dictionary and 10 times larger word size - can't confirm its impact on the compression time):

It gives the compression ratio of 0.12 (compressed sizes / original size) and it's 18...20% faster than -mx4. Higher compression can be achieved with a=1, higher values for d, fb and mc at the expense of increased compression time.

For comparison, WinRar "Best" method with default options results in 0.11 compression ratio and is approximately 6x slower, "Fastest" method gives 0.17 compression and is 1.5 times faster. Rar archives are 3x faster to extract though.

Can anyone tell me how to create a dump file for Oracle 10g database? I need to export and import all tables of a particular user in the database to another system. Some friends suggested that it is possible through command prompt.

If u use TOAD, then it is very convenient, use EXPORT/IMPORT facility of

TOAD, it has to be used on DB server. There will be prompts, which u follow.

It creates a log file also, which u can see, in case of exp/import errors.

I disagree - if selected tables/user info etc. is required, this MUST be included in the command line or par file.

I would recommend the use of a par file, as this can eb used again with minor changes.

Example below.

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Amazon S3 is an object storage service that offers industry-leading scalability, security, and performance. When you use Amazon S3, you can store and retrieve any amount of data from anywhere at any time.

When you store data in an S3 bucket, Amazon S3 provides data protection for data at rest through server-side encryption and client-side encryption. For more information about protecting data in Amazon S3, see the AWS documentation.

To use Amazon S3 as a target for transferring the Oracle Database dump files, you must configure the AWS CLI on the source server. For information on how to install and configure the AWS CLI, see the AWS documentation.

Here the problem is, we are regularly creating the oracle backup files (Which contains lot of ArcSDE spatial table and multiple versions) using oracle export utility tool and it is creating a .dmp file. When we are importing it in oracle test environment with oracle import utility, all the users, schema and their roles are importing with out any error.But when we connect to the SDE through catalog all the Feature datasets and Feature Classes are available with out data. i.e, only schema is available.

Abstract: Abnormal termination of a process will trigger a core dump file. A core dump file is very helpful to programmers or support engineers for determining the root cause of abnormal termination, because it provides invaluable information about the runtime status at crash time. This article provides information about core dumps, as well as features and analysis tools in the Solaris Operating System that can be used to manage core dumps.

A core dump is a file that records the contents of a process along with other useful information, such as the processor register's value. There are two types of core dumps: system core dumps and process core dumps. They differ in many aspects, such as the manner in which they are created and the method used to analyze them.

When an application process receives a specific signal and terminates, the system generates a core dump and stops the process. In most cases, the signal leading to the application crash is SIGSEGV or SIGBUS.

On the Solaris OS, you can use the libumem(3LIB) library as the user-mode memory allocator instead of libc. The libumem library can help find memory leaks, buffer overflows, attempts to use freed data, and many other memory allocation errors. Also, its memory allocator is very fast and scalable with multithreaded applications.

SIGBUS indicates that the application is accessing a memory address that does not conform to CPU memory alignment rules. This usually happens to a system with an UltraSPARC processor. Systems with x86/x64 CPUs can handle unaligned memory addresses, but there is a performance impact.

The Sun Studio C/C++ compiler has the -xmemalign option, which can be used to adjust the behavior of the UltraSPARC CPU when there are unaligned memory addresses that can be determined at compile time. The -xmemalign option causes the compiler to generate additional load/store instructions for unaligned memory access. However, the -xmemalign option cannot handle unaligned memory access during runtime. If unaligned memory access happens during runtime, the developer needs to change the source code.

The Solaris OS attempts to create up to three core dump files for each abnormally terminated process. One of the core dump files, which is called the per-process core file, is located in the current directory. Another core dump file, which is called the global core file, is created in the system-wide location. If the process is running in a local zone, a third core file is created in the global zone's location.

This command causes the per-process core file name to be appended with the program file name (%f) and the runtime process ID (%p). A core dump file will be generated in the current working directory of the process.

By default, the global core dump is disabled. You need to use the coreadm command with the -e global option to enable it. The -g option causes the command to append the program name (%f) and the runtime process ID (%p) to the core file name.

As indicated previously, coreadm can specify the parts of the process that will be saved to the core file. Previously, when you performed a post-mortem analysis, you needed to obtain all the specific versions of the dependent libraries and runtime modules, because the core dump file does not contain this text information. It is quite a headache for programmers to recreate the environment from the original machine.

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