Private Table
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Private Table
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Oracle 18c introduced the concept of a private temporary table, a memory-based temporary table that is dropped at the end of the session or transaction depending on the setup.
If you've come to Oracle from a different database engine, like SQL Server, you might be confused by Oracle's idea of temporary tables. In SQL Server developers will regularly create a temporary table to do some work and drop it. In Oracle a Global Temporary Table (GTT) is a permanent metadata object that holds rows in temporary segments on a transaction-specfic or session-specific basis. It is not considered normal to create and drop GTTs on the fly. With the introduction of private temporary tables, Oracle has an option similar to that seen in other engines, where the table object itself is temporary, not just the data.
Oracle support two types of temporary tables.
The PRIVATE_TEMP_TABLE_PREFIX initialisation parameter, which defaults to "ORA$PTT_", defines the prefix that must be used in the name when creating the private temporary table. In the following example we create a private temporary table without using the correct prefix in the name, which results in an error.
The syntax for creating a private temporary table will look familiar if you have used global temporary tables.
The ON COMMIT DROP DEFINITION clause, the default, indicates the table should be dropped at the end of the transaction, or the end of the session.
In contrast, the ON COMMIT PRESERVE DEFINITION clause indicates the table and any data should persist beyond the end of the transaction. The table will be dropped at the end of the session.
The above output shows the table persists beyond the commit, but is dropped when we disconnect and create a new session.
We can also create private temporary tables using the CTAS method.
It doesn't make sense for a permanent PL/SQL object to directly reference a temporary object, as it would not exist at compile time. If you want to use a private temporary table from a permanent object it would have to be done using dynamic SQL. The following silly example creates a stored function which uses a private temporary table.
Private temporary tables are memory-based, so there is no metadata recorded in the data dictionary. As a result you can't use the USER_TABLES view to display the list of private temporary tables in the current session. The following views are available to display information about private temporary tables.
Private temporary tables share the limitations of global temporary tables ( see here ), but there are also additional restrictions.
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Private Tables | AppSheet Help Center
ORACLE-BASE - Private Temporary Tables in Oracle Database 18c
MySQL Private Table ? - Stack Overflow
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a private table - Translation into Russian - examples... | Reverso Context
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Asked
5 years, 8 months ago
Active
5 years, 8 months ago
6,332 8 8 gold badges 47 47 silver badges 84 84 bronze badges
I think you need to redesign your solution. Create a session table and a user is given a session key when they open the app. Then they interact with a shared table that has a session key.
– Tobsey
May 12 '15 at 15:06
I like how you used an airplane and are trying to turn it into a skateboard. I'd reconsider explaining what's being done and why you think that MySQL "private" table is a solution (it's obviously not, since the requirement you have is way, way off the charts). This is a classic XY problem and I strongly advise explaining what you're trying to achieve and scrap this "private" table solution.
– N.B.
May 12 '15 at 15:09
You can bundle an SQLite Db with the app to handle these tables. Unless it needs to relate to some of the shared data.
– pala_
May 12 '15 at 15:13
Good idea pala_, unfortunately, I do need to "join" this data with shared tables.
– panofish
May 12 '15 at 15:15
@Tobsey, the session table idea is a good one. I will probably do this OR simply use application memory. Thanks.
– panofish
May 12 '15 at 15:22
2,125 2 2 gold badges 21 21 silver badges 40 40 bronze badges
I thought I would ask, just in case there were such a thing as a private mysql table. I will probably have to use application memory to accomplish this.
– panofish
May 12 '15 at 15:18
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I am looking to create a table that has the following characteristics:
A TEMPORARY table is close to what I need, except the table is lost whenever the connection is closed. This is not desired.
SYNOPSIS: When the users starts my desktop application, I need to create this private table. The user will interact multiple times with the app and each time I need to open the MySQL connection, read/update the table and then close the connection. Finally, once the user closes the application, I can drop the table. All the while, this table is meant for this user and should not be shared or conflict with other users sessions and their own copy of the same table.
This table will need to be related to existing shared tables (e.g. joined).
UPDATE: I will attempt to use a Boost.Bimap to accomplish this in memory.
I think you're using the wrong tool for the job,
try one of these:
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