Throw Away Half of Your Disks and Run Your Database ... - Oracle

Throw Away Half of Your Disks and Run Your Database ... - Oracle Throw Away Half of Your Disks and Run Your Database ... - Oracle

04.04.2013 Views

OLTP Table Compression Uncompressed Block Header 1•John•Doe 2•Jane• Doe 3•John•Smith 4• Jane • Doe 5•Jack •Smith Free Space Local Symbol Table Compressed Block Header John=|Doe=|Jane=|Smith= 1•John•Doe 2•Jane• •Doe 5•Jack• 3•John•Smith 4• Jane • Doe Free Space Free Space 1•• 2•• 3•• 4 • More Data Per Block

Table Compression Syntax OLTP Table Compression Syntax: CREATE TABLE emp ( emp_id NUMBER , first_name VARCHAR2(128) , last_name VARCHAR2(128) ) COMPRESS FOR ALL OPERATIONS; Direct Load Compression Syntax (default): CREATE TABLE emp ( emp_id NUMBER , first_name VARCHAR2(128) , last_name VARCHAR2(128) ) COMPRESS [FOR DIRECT_LOAD OPERATIONS];

OLTP Table Compression<br />

Uncompressed Block<br />

Header<br />

1•John•Doe 2•Jane•<br />

Doe 3•John•Smith 4•<br />

Jane • Doe 5•Jack<br />

•Smith Free Space<br />

Local<br />

Symbol Table<br />

Compressed Block<br />

Header<br />

John=|Doe=|Jane=|Smith=<br />

1•John•Doe 2•Jane•<br />

•Doe 5•Jack• 3•John•Smith 4•<br />

Jane • Doe<br />

Free Space<br />

Free Space<br />

1•• 2•• 3•• 4 • <br />

More Data<br />

Per Block

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