How fast is SQL Loader?
And the Results! That, according to my math is 10,753 records inserted per second. So, using SQL*Loader was 3,144% faster than SQL Developer.
Why SQL Loader is faster than insert?
A direct path load is faster than the conventional path for the following reasons: Partial blocks are not used, so no reads are needed to find them, and fewer writes are performed. SQL*Loader need not execute any SQL INSERT statements; therefore, the processing load on the Oracle database is reduced.
What is the difference between SQL Loader and Utl_file?
2 Answers. The performance difference is quite simple: UTL_FILE is a PL/SQL package, while external tables use the SQL*Loader code written in C.
What is the use of external table in Oracle?
External tables allow Oracle to query data that is stored outside the database in flat files. The ORACLE_LOADER driver can be used to access any data stored in any format that can be loaded by SQL*Loader. No DML can be performed on external tables but they can be used for query, join and sort operations.
What is SQL Loader in Oracle?
SQL*Loader loads data from external files into tables of an Oracle database. It has a powerful data parsing engine that puts little limitation on the format of the data in the datafile. … Load data from multiple datafiles during the same load session. Load data into multiple tables during the same load session.
What is bind array in SQL Loader?
The bind array is the area in memory where SQL*Loader stores a batch of data to be loaded. When the bind array fills, it is transmitted to the database. Generally, the larger the bind array, the more rows can be loaded in one operation, and the better your performance will be.
Is bulk insert faster than insert?
In short, Bulk insert is faster. You can use bulk insert to insert millions of rows from a csv or xml or other files in a very short time however if you only have 3 or 4 rows to insert it’s quick enough to just throw it in using insert statements.
Is SQL Loader an ETL tool?
But these tools typically can’t take advantage of the high-performance capabilities of the ETL tools, or the brand-specific loading tools, like Oracle’s SQL*Loader utility. They just do traditional database inserts either via ODBC or JDBC.
What is SQL Loader in Oracle 12c?
SQL*Loader is a utility provided by the Oracle to load the data into Oracle databases from various files like ascii files,textfiles,external files and csv files etc.., SQL*Loader provides two methods for loading data: conventional path load. direct path load.
What is Utl_file in Oracle with example?
UTL_FILE I/O capabilities are similar to standard operating system stream file I/O ( OPEN , GET , PUT , CLOSE ) capabilities, but with some limitations. For example, you call the FOPEN function to return a file handle, which you use in subsequent calls to GET_LINE or PUT to perform stream I/O to a file.
What is mutating in the trigger?
A mutating table error (ORA-04091) occurs when a row-level trigger tries to examine or change a table that is already undergoing change (via an INSERT, UPDATE, or DELETE statement).
How can you enable a trace for a session?
You can enable SQL Trace for your own session with the following SQL statement: ALTER SESSION SET SQL_TRACE = TRUE; Alternately, from PL/SQL, you can make the following procedure call: DBMS_SESSION.
What is SQL external table?
The external tables feature is a complement to existing SQL*Loader functionality. It enables you to access data in external sources as if it were in a table in the database. Prior to Oracle Database 10g, external tables were read-only. However, as of Oracle Database 10g, external tables can also be written to.
Can we update external table in Oracle?
About External Tables. Oracle Database allows you read-only access to data in external tables. … You can also create views and synonyms for external tables. However, no DML operations ( UPDATE , INSERT , or DELETE ) are possible, and no indexes can be created, on external tables.
Can we create partition on external table in Oracle?
Partitioned external tables were introduced in Oracle Database 12c Release 2 (12.2), allowing external tables to benefit from partition pruning and partition-wise joins. With the exception of hash partitioning, many partitioning and subpartitioning strategies are supported with some restrictions.