Merge pull request #246 from oracle-devrel/Ulrike-23c-assets

Ulrike 23c assets

Author: JesusGitHubOracle

data-platform/core-converged-db/database-23c/transactions/automatic-rollback/README.md

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+# Automatic Transaction Rollback Feature 
+
+In Oracle Database 23c, apps can assign priorities (LOW, MEDIUM, HIGH) to transactions and configure how long a higher priority transaction should wait for row locks on a lower priority one. After the timeout, 
+the blocking transaction is automatically rolled back and row locks released so that the higher priority transaction can proceed.
+ 
+
+## Useful Links
+
+### Documentation
+
+- [23c Database Administrator's Guide](https://docs.oracle.com/en/database/oracle/oracle-database/23/admin/managing-transactions.html#GUID-14B028D0-48EA-4675-A113-48286AFCD8AB)
+- [23c Database Reference](https://docs.oracle.com/en/database/oracle/oracle-database/23/refrn/TXN_PRIORITY.html#GUID-9E60833D-8B58-4E71-9CAF-60EB4C5648C7)
+- [23c Database Reference](https://docs.oracle.com/en/database/oracle/oracle-database/23/refrn/TXN_AUTO_ROLLBACK_HIGH_PRIORITY_WAIT_TARGET.html#GUID-B835CD39-221B-40CF-8F59-098101FD2D74)
+- [23c Database Reference](https://docs.oracle.com/en/database/oracle/oracle-database/23/refrn/TXN_AUTO_ROLLBACK_MODE.html#GUID-454171AA-19AA-44FC-A18D-0DE7C4676190)
+
+
+### Team Publications
+
+- [Automatic transaction rollback in 23c with high, medium and low priority transactions](https://blogs.oracle.com/coretec/post/automatic-transaction-rollback-in-23c)
+
+### Blogs
+
+- [Automatic transaction rollback in 23c with high, medium and low priority transactions](https://blogs.oracle.com/coretec/post/automatic-transaction-rollback-in-23c)
+
+
+# License
+
+Copyright (c) 2023 Oracle and/or its affiliates.
+
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See LICENSE for more details.

data-platform/core-converged-db/database-23c/transactions/automatic-rollback/automatic-transaction-rollback-v$parameter.sql

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+REM  Script in 23c: automatic-transaction-rollback-v$parameter.sql
+REM  Check the settings in V$PARAMETER for automatic transaction rollback 
+
+-- run in 23c in your PDB session as user with DB_DEVELOPER_ROLE  
+col name format a50 
+col value format a10 
+select name, value from v$parameter where name like 'tx%'; 

data-platform/core-converged-db/database-23c/transactions/automatic-rollback/automatic-transaction-rollback-v$session.sql

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+REM  Script for 23c: automatic-transaction-rollback-v$session.sql
+REM  Check transactions in V$SESSION with columns EVENT, SECONDS_IN_WAIT and BLOCKING_SESSION to analyze the locking situation. 
+
+col event format a35
+select sid, event, seconds_in_wait, blocking_session      
+from v$session where  event like '%enq%';

data-platform/core-converged-db/database-23c/transactions/automatic-rollback/automatic-transaction-rollback-v$transaction.sql

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+REM  Script for 23c: automatic-transaction-rollback-v$transaction.sql
+REM  Check V$TRANSACTION with new columns TXN_PRIORITY and TXN_PRIORITY_WAIT_TARGET to mointor session settings for automatic rollback transaction
+
+select txn_priority, txn_priority_wait_target from v$transaction;