What is parallel data loading?
SQL*Loader supports parallel loading by allowing you to initiate multiple concurrent direct path load sessions that all load data into the same table or into the same partition of a partitioned table. Initiate multiple SQL*Loader sessions, one for each control file and datafile pair.
What is database parallel processing?
A parallel database is designed to take advantage of such architectures by running multiple instances which “share” a single physical database. In appropriate applications, a parallel server can allow access to a single database by users on multiple machines, with increased performance.
What is load in parallel in ETL?
The ETL was implemented as a set of Table Load ETL processes running in parallel. The set of records in each source table assigned to transfer was divided into chunks of the same size (e.g. 20000 records). The ETL process for each source table was performed in a cycle, selecting the data consecutively, chunk by chunk.
What is the role of parallel processing in data warehousing?
Parallel execution dramatically reduces response time for data-intensive operations on large databases typically associated with decision support systems (DSS) and data warehouses. You can also implement parallel execution on certain types of online transaction processing (OLTP) and hybrid systems.
What is direct path load in SQL Loader?
The direct path loader (direct=true) loads directly into the Oracle data files and creates blocks in Oracle database block format. To prepare the database for direct path loads, the script $ORACLE_HOME/rdbms/admin/catldr. sql. sql must be executed.
What is the drawback of parallel database architecture?
Architecture of parallel database Disadvantages : Waiting Time for processor is increased, degree of parallelism is limited, addition of CPU slow down the existing processors. In this single disk is shared between the CPUs and each CPU have it’s own private memory .
How processing of query can speed up with Intraquery parallelism?
Intraquery parallelism refers to the execution of a single query in parallel on multiple processors and disks. We can speed up processing of a query by parallelizing the execution of each individual operation, such as sort, select, project, and join.
What is the difference between direct path and conventional path loading?
A conventional path load executes SQL INSERT statements to populate tables in an Oracle database. A direct path load eliminates much of the Oracle database overhead by formatting Oracle data blocks and writing the data blocks directly to the database files. The tables to be loaded must already exist in the database.