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Creating Data Matrix ECC200 in Objective-C Extent Trimming and Locally-Managed Tablespaces

Extent Trimming and Locally-Managed Tablespaces
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Enter locally-managed tablespaces. There are two types: UNIFORM SIZE, whereby every extent in the tablespace is always precisely the same size, and AUTOALLOCATE, whereby Oracle decides how big each extent should be using an internal algorithm. Both of these approaches nicely solve the 99MB of free space/followed by 1MB of used space/followed by 99MB of free space problem. However, they each solve it very differently. The UNIFORM SIZE approach obviates extent trimming from consideration all together. When you use UNIFORM SIZEs, Oracle cannot perform extent trimming. All extents are of that single size none can be smaller (or larger) than that single size. AUTOALLOCATE extents, on the other hand, do support extent trimming, but in an intelligent fashion. They use a few specific sizes of extents and have the ability to use space of different sizes that is, the algorithm permits the use of all free space over time in the tablespace. Unlike the dictionary-managed tablespace, where if you request a 100MB extent, Oracle will fail the request if it can find only 99MB free extents (so close, yet so far), a locally-managed tablespace with AUTOALLOCATE extents can be more flexible. It may reduce the size of the request it was making in order to attempt to use all of the free space. Let s now look at the differences between the two locally-managed tablespace approaches. To do that, we need a real-life example to work with. We ll set up an external table capable of being used in a parallel direct path load situation, which is something that we do frequently. Even if you are still using SQL*Loader to parallel direct path load data, this section applies entirely you just have manual scripting to do to actually load the data. So, in order to investigate extent trimming, we need to set up our example load and then perform the loads under varying conditions and examine the results.
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Setting Up for Locally-Managed Tablespaces
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To get started, we need an external table. I ve found time and time again that I have a legacy control file from SQL*Loader that I used to use to load data, one that looks like this, for example: LOAD DATA INFILE '/tmp/big_table.dat' INTO TABLE big_table REPLACE
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CHAPTER 14 PARALLEL EXECUTION
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FIELDS TERMINATED BY '|' ( id ,owner ,object_name ,subobject_name ,object_id ,data_object_id ,object_type ,created ,last_ddl_time ,timestamp ,status ,temporary ,generated ,secondary ,namespace ,edition_name ) We can convert this easily into an external table definition using SQL*Loader itself: $ sqlldr big_table/big_table big_table.ctl external_table=generate_only SQL*Loader: Release 11.2.0.1.0 - Production on Wed Apr 14 12:48:12 2010 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
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Note If you are curious about the SQLLDR command and the options used with it, we ll be covering that in
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detail in the next chapter on Data Loading and Unloading.
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Notice the parameter EXTERNAL_TABLE passed to SQL*Loader. It causes SQL*Loader, in this case, to not load data, but rather to generate a CREATE TABLE statement for us in the log file. This CREATE TABLE statement looked as follows (this is an abridged form; I ve edited out repetitive elements to make the example smaller): CREATE TABLE "SYS_SQLLDR_X_EXT_BIG_TABLE" ( "ID" NUMBER, ... "EDITION_NAME" VARCHAR2(30) ) ORGANIZATION external ( TYPE oracle_loader DEFAULT DIRECTORY my_dir ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE CHARACTERSET US7ASCII BADFILE 'SYS_SQLLDR_XT_TMPDIR_00001':'big_table.bad' LOGFILE 'big_table.log_xt' READSIZE 1048576 FIELDS TERMINATED BY "|" LDRTRIM REJECT ROWS WITH ALL NULL FIELDS ( "ID" CHAR(255) TERMINATED BY "|", ... "EDITION_NAME" CHAR(255) TERMINATED BY "|" ) ) location (
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CHAPTER 14 PARALLEL EXECUTION
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'big_table.dat' ) )REJECT LIMIT UNLIMITED All we need to do is edit it to name the external table the way we want, perhaps change the directories, and so on: ops$tkyte@ORA11GR2> create or replace directory my_dir as '/tmp/' 2 / Directory created. And after that, all we need to do is actually create the table: ops$tkyte@ORA11GR2> CREATE TABLE "BIG_TABLE_ET" 2 ( 3 "ID" NUMBER, 18 "EDITION_NAME" VARCHAR2(30) 19 ) 20 ORGANIZATION external 21 ( 22 TYPE oracle_loader 23 DEFAULT DIRECTORY my_dir 24 ACCESS PARAMETERS 25 ( 26 RECORDS DELIMITED BY NEWLINE CHARACTERSET US7ASCII 27 READSIZE 1048576 28 FIELDS TERMINATED BY "|" LDRTRIM 29 REJECT ROWS WITH ALL NULL FIELDS 30 ) 31 location 32 ( 33 'big_table.dat' 34 ) 35 )REJECT LIMIT UNLIMITED 36 / Table created. Then we make this table parallel enabled. This is the magic step this is what will facilitate an easy parallel direct path load: ops$tkyte@ORA11GR2> alter table big_table_et PARALLEL; Table altered.
Note The PARALLEL clause may also be used on the CREATE TABLE statement itself. Right after the REJECT
LIMIT UNLIMITED, the keyword PARALLEL could have been added. I used the ALTER statement just to draw attention to the fact that the external table is, in fact, parallel enabled.
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