How to fix ORA 02049?
To resolve ORA-02049, you would need to increase the SHARED_POOL_SIZE value in init. ora . If you find that the shared pool is large enough and the ORA-02049 error continues to exist, you may also want to try flushing the shared pool with ALTER SYSTEM FLUSH SHARED_POOL; to free even more space.
What is DISTRIBUTED_LOCK_TIMEOUT?
DISTRIBUTED_LOCK_TIMEOUT specifies the amount of time (in seconds) for distributed transactions to wait for locked resources.
What is distributed transaction in Oracle?
A distributed transaction includes one or more statements that, individually or as a group, update data on two or more distinct nodes of a distributed database.
What is dba_2pc_pending?
The dba_2pc_pending view contains an ADVISE column that directs the database to either commit or roll back the pending item.
What is Shared_pool_size?
SHARED_POOL_SIZE specifies (in bytes) the size of the shared pool. The shared pool contains shared cursors, stored procedures, control structures, and other structures. If you set PARALLEL_AUTOMATIC_TUNING to false , then Oracle also allocates parallel execution message buffers from the shared pool.
What is the difference between a local transaction and a distributed transaction?
What is the difference between a Local Transaction and a Distributed Transaction? a. Local transactions are performed on a single database table, but distributed transactions are performed on more than one database tables.
What is the use of library cache?
The library cache is sometimes referred to as the “shared SQL area”. As the name implies, the shared SQL area is used to keep and process SQL statements and PL/SQL code. Included in the library cache are all shared structures.
What is dba_2pc_neighbors?
The dba_2pc_neighbors view contains information about incoming and outgoing connections for pending transactions. This script to query for a specific transaction: select *
What is Oracle doubt distributed transaction?
Distributed transactions can become in-doubt in the following ways: A server machine running Oracle Database software crashes. A network connection between two or more Oracle Databases involved in distributed processing is disconnected. An unhandled software error occurs.
What is Sga_target?
SGA_TARGET specifies the total size of all SGA components. If SGA_TARGET is specified, then the following memory pools are automatically sized: Buffer cache ( DB_CACHE_SIZE ) Shared pool ( SHARED_POOL_SIZE ) Large pool ( LARGE_POOL_SIZE )
What is Sga_max_size?
SGA_MAX_SIZE specifies the maximum size of the SGA for the lifetime of the instance. On 64-bit platforms and non-Windows 32-bit platforms, when either MEMORY_TARGET or MEMORY_MAX_TARGET is specified, the default value of SGA_MAX_SIZE is set to the larger of the two parameters.
Why do we need distributed transactions?
Why Do You Need Distributed Transactions? Distributed transactions are necessary when you need to quickly update related data that is spread across multiple databases.
How do distributed transactions work?
Unlike a transaction on a local database, a distributed transaction involves altering data on multiple databases. Consequently, distributed transaction processing is more complicated, because Oracle must coordinate the committing or rolling back of the changes in a transaction as a self-contained unit.
What is Oracle library cache?
Oracle’s library cache is nothing more than an area in. memory, specifically one of three parts inside the shared pool. The library. cache is composed of shared SQL areas, PL/SQL packages and procedures, various. locks & handles, and in the case of a shared server configuration, stores.
What is difference between SGA and PGA in Oracle?
Basic Memory Structures All server and background processes share the SGA. Examples of data stored in the SGA include cached data blocks and shared SQL areas. A PGA is a nonshared memory region that contains data and control information exclusively for use by an Oracle process.
What are in doubt transactions?
An indoubt transaction is a global transaction that was left in an indoubt state. This occurs when either the Transaction Manager (TM) or at least one Resource Manager (RM) becomes unavailable after successfully completing the first phase (that is, the PREPARE phase) of the two-phase commit protocol.
How do I solve ORA 01591?
You can query uncommitted or pending transaction with following script. This script will generate rollback force command also, so you can execute the result of following command. SQL> select ‘rollback force ”’||local_tran_id||”’;’ from DBA_2PC_PENDING where state=’prepared’; rollback force ‘72.6.
What is Pga_aggregate_limit?
PGA_AGGREGATE_LIMIT specifies a limit on the aggregate PGA memory consumed by the instance. There is no difference in behavior between PGA_AGGREGATE_LIMIT being explicitly set or being set to the default. Actions Taken When PGA_AGGREGATE_LIMIT is Exceeded. Parallel queries will be treated as a unit.
How do you handle distributed transactions?
How the Saga pattern helps in a distributed transaction scenario
- Maintain data consistency across multiple microservices without tight coupling.
- Perform better compared to 2PC.
- Offer no single point of failure.
- Keep the overall state of the transaction eventually consistent.
What are the types of transactions in distributed databases?
Distributed transactions can be structured in two different ways:
- Flat transactions.
- Nested transactions.