insertion of in-memory table

I tested the feature in memory of 12.1.0.2 insert operation.

The following SQL code:

insert into IM_TABLE (id, col1, col2)

Select (seq_id.nextval, col1, col2) no_im_table

where id not in (select id from IM_TABLE)

Here is the execution plan:

INSERT STATEMENT

LOAD TABLE CONVENTIONAL (IM_TABLE)

SEQUENCE (SEQ_ID)

FILTER

VIEW

UNIQUE HASH

TABLE ACCESS FULL

TABLE ACCESS INMEMORY FULL (IM_TABLE)

EM Express, I found 'TABLE ACCESS FULL INMEMORY' 99% of the activity. Should I disable in memory while doing insertion?

The 99 percent figure is meaningless. It's 99 percent of the total, and if your database is low on activity, meetings who do something, automatically gets a high percentage.

You can't judge the performance of a statement by looking at an overall figure, you should see the performance of individual training, using dbms_xplan.display.

So your conclusion, you must turn the memory in function may not rely on that figure and is probably not correct.

-----------

Sybrand Bakker

Senior Oracle DBA

Tags: Database

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