Simple .NET/ASP.NET PDF document editor web control SDK

If you don t have duplicate date and timestamp values in your data, or if there are few such duplicates, you can disable the DATA_CACHE parameter by setting it to zero (DATA_CACHE=0) ROWS: The ROWS parameter is crucial because you can use it to specify how many rows SQL*Loader will read from the input data file before saving the insertions to the tables You use the ROWS parameter to set the ceiling on the amount of data lost if the instance fails during a long SQL*Loader run When SQL*Loader reads the number of rows specified in the ROWS parameter, it will stop loading data until all of the data buffers are successfully written to the data files This process is called a data save Oracle recommends that you set the ROWS parameter such that data is saved to the table every 15 minutes.

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For example, if SQL*Loader can load about 10,000 rows per minute, setting ROWS=150000 saves the data every 15 minutes UNRECOVERABLE: If you want to minimize the use of the redo log, you can do so by using the UNRECOVERABLE parameter during a direct load (UNRECOVERABLE=true) SKIP_INDEX_MAINTENANCE: The SKIP_INDEX_MAINTENANCE parameter, when turned on (SKIP_ INDEX_MAINTENANCE=true), instructs SQL*Loader not to bother maintaining the indexes during the load The default for SKIP_INDEX_MAINTENANCE is false SKIP_UNUSABLE_INDEXES: Setting a value of true for the SKIP_UNUSABLE_INDEXES parameter will ensure that SQL*Loader will load tables with indexes in an unusable state These indexes won t be maintained by SQL*Loader, however The default for this parameter is based on the setting for the SKIP_UNUSABLE_INDEXES initialization parameter, whose default value is true SORTED_INDEXES: The SORTED_INDEXES parameter signals SQL*Loader that data is sorted on a specified index, which helps improve load performance.

COLUMNARRAYROWS: This parameter determines the number of rows loaded before the building of the stream buffer For example, COLUMNARRAYROWS=100000 loads 100,000 rows first The size of the direct-path column array is thus determined by this parameter The default value for this parameter on my UNIX server is 5,000..

STREAMSIZE: The STREAMSIZE parameter lets you set the size of the stream buffer. The default on my server, for example, is 256,000, and I can increase it using the STREAMSIZE parameter; for example, STREAMSIZETREAMSIZE=512000. MULTITHREADING: Under MULTITHREADING, the conversion of column arrays to stream buffers and stream buffer loading are performed in parallel. On machines with multiple CPUs, by default, multithreading is turned on (true). If you wish, you can turn it off by setting MULTITHREADING=false.

The direct-path loading method inserts data directly into the data files by formatting the data blocks. By bypassing the INSERT statement mechanism, the table constraints and triggers aren t systematically applied during a direct load. All triggers are disabled, as are several integrity constraints. SQL*Loader automatically disables all foreign keys and check constraints, but the not null, unique, and primary key constraints are still maintained by SQL*Loader. Upon completion of the SQL*Loader run, the disabled constraints are automatically enabled by SQL*Loader if the REENABLE clause has been specified. Otherwise, the disabled constraints must be manually reenabled. The disabled triggers are automatically enabled after the load is completed.

The next example represents a scenario in which the script does not pipe to a loop, but instead pipes input to a read statement. This method works well in ksh. Within both pdksh and bash, once the following command is executed, both foo and bar variables are undefined:

The following tips will help you optimize SQL*Loader during data loads, especially when the data loads are large and/or you have multiple indexes and constraints on the tables in your database Try to use the direct-path loading method as much as possible It s much faster than conventional data loading Use the UNRECOVERABLE=true option wherever possible (in direct loads) This will save you considerable time, because the newly loaded data doesn t need to be logged in the redo log file Media recovery is still in force for all the other users of the database, and you can always start a new SQL*Loader run if there s a problem Keep the use of the NULLIF and DEFAULTIF parameters to a minimum These clauses must be tested for every single row on which they re used Minimize the number of data type and character set conversions, as they slow down processing.