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CHAPTER 16 DATA ENCRYPTION
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ops$tkyte%ORA11GR2> create tablespace clear 2 datafile '/tmp/clear.dbf' size 1m 3 autoextend on next 1m; Tablespace created. Next, we ll create the tables for the simulation. We ll use a STAGE table once again as a copy of ALL_OBJECTS and then two tables each in one of the above tablespaces. Additionally, we ll create primary key indexes on these tables, placing the index in the same tablespace with the table data. Thus, the index on the encrypted data will likewise be encrypted. First the STAGE table ops$tkyte%ORA11GR2> create table stage 2 as 3 select * 4 from all_objects 5 / Table created. and then the NONENCRYPTED table and primary key index ops$tkyte%ORA11GR2> create table nonencrypted 2 tablespace nonencrypted 3 as 4 select * 5 from stage 6 where 1=0 7 / Table created. ops$tkyte%ORA11GR2> alter table nonencrypted 2 add constraint nonencrypted_pk 3 primary key(object_id) 4 using index 5 (create index nonencrypted_pk 6 on nonencrypted(object_id) 7 tablespace clear ); Table altered. followed by the ENCRYPTED table and index ops$tkyte%ORA11GR2> create table encrypted 2 tablespace encrypted 3 as 4 select * 5 from stage 6 where 1=0 7 / Table created. ops$tkyte%ORA11GR2> alter table encrypted 2 add constraint encrypted_pk 3 primary key(object_id) 4 using index 5 (create index encrypted_pk
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CHAPTER 16 DATA ENCRYPTION
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6 on encrypted(object_id) 7 tablespace encrypted ); Table altered. Lastly, we ll use a slightly modified version of DO_SQL. The following just highlights the modifications from the copy we used in the column encryption section. The modifications allow us to pass in a table name since we are using two tables instead of two columns in this simulation. The rest of the code remains unchanged from before: ops$tkyte%ORA11GR2> create or replace 2 procedure do_sql( p_sql in varchar2, 3 p_tname in varchar2, 4 p_truncate in boolean default true ) 5 authid current_user 6 as 7 l_start_cpu number; 8 l_start_redo number; 9 l_total_redo number; 10 begin 11 if (p_truncate) 12 then 13 execute immediate 'truncate table ' || p_tname; 14 end if; 15 16 dbms_output.put_line( replace( p_sql, '#TNAME#', p_tname ) ); 17 18 l_start_cpu := dbms_utility.get_cpu_time; 19 l_start_redo := get_stat_val( 'redo size' ); 20 21 execute immediate replace(p_sql,'#TNAME#', p_tname); 22 commit work write batch wait; 23 24 dbms_output.put_line 25 ( (dbms_utility.get_cpu_time-l_start_cpu) || ' cpu hsecs' ); 26 27 l_total_redo := 28 round((get_stat_val('redo size')-l_start_redo)/1024/1024,1); 29 dbms_output.put_line 30 ( to_char(l_total_redo,'999,999,999.9') || ' mbytes redo' ); 31 end; 32 / Procedure created. And now we are ready to go! We ll start with a bulk load using a conventional path load of the tables: ops$tkyte%ORA11GR2> begin 2 do_sql( 'insert into #TNAME# select * from stage', 'nonencrypted' ); 3 do_sql( 'insert into #TNAME# select * from stage', 'encrypted' ); 4 end; 5 / insert into nonencrypted select * from stage 203 cpu hsecs
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CHAPTER 16 DATA ENCRYPTION
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23.8 mbytes redo insert into encrypted select * from stage 225 cpu hsecs 23.8 mbytes redo PL/SQL procedure successfully completed. As you can see, there was hardly any impact on the CPU utilization and no impact on redo generated as a result of this. Since our work was primarily done in the buffer cache, we didn t have to wait for physical IOs to take place, so we didn t see a measurable difference between the two. What if we introduce a direct path load, however, bypassing the buffer cache and writing directly to disk It would look like this: ops$tkyte%ORA11GR2> begin 2 do_sql( 'insert /*+ APPEND */ into #TNAME# select * from stage', 'nonencrypted' ); 3 do_sql( 'insert /*+ APPEND */ into #TNAME# select * from stage', 'encrypted' ); 4 end; 5 / insert /*+ APPEND */ into nonencrypted select * from stage 135 cpu hsecs 15.9 mbytes redo insert /*+ APPEND */ into encrypted select * from stage 184 cpu hsecs 15.9 mbytes redo PL/SQL procedure successfully completed. Here we noticed a small but noticeable increase in CPU utilization nothing on the order of the do it yourself encryption or even the column level encryption, however. Remember, your mileage may vary widely; it will be very specific to your hardware capabilities. Now we d like to see single row (slow by slow) insert performance. Using a simple for loop, we can see: ops$tkyte%ORA11GR2> declare 2 l_sql long := 3 'begin ' || 4 'for x in (select * from stage) ' || 5 'loop ' || 6 'insert into #TNAME# values X; ' || 7 'end loop; ' || 8 'end; '; 9 begin 10 do_sql( l_sql, 'nonencrypted' ); 11 do_sql( l_sql, 'encrypted' ); 12 end; 13 / begin for x in (select * from stage) loop insert into nonencrypted values X; end loop; end; 951 cpu hsecs 40.0 mbytes redo begin for x in (select * from stage) loop insert into
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