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Don Burleson Blog 







ORA-30009: Not enough memory for CONNECT BY operation

Oracle Database Tips by Donald BurlesonMay 15, 2016

Question: What causes this ORA-30009 error?

ORA-30009: Not enough memory for CONNECT BY operation

What is the solution to the ORA-30009 error?

Answer:  The oerr utility shows this for the ORA-30009 error:

ORA-30009: Not enough memory for CONNECT BY operation

Cause: The memory size was not sufficient to process all the levels of the hierarchy specified by the CONNECT BY clause.

Action: In WORKAREA_SIZE_POLICY=AUTO mode, set PGA_AGGREGATE_TARGET to a reasonably larger value. Or, in WORKAREA_SIZE_POLICY=MANUAL mode, set SORT_AREA_SIZE to a reasonably larger value.

One solution is to create pipelined function with a FOR loop instead of using "connect by".

This error is cased by a lack of PGA memory.  First, you could increase the sort_area_size for the individual session:

alter session set sort_area_size=10G;

For a system wide change, you would want to increase the overall size of the PGA, bearing in-mind that any session may only consume 5% of the total available:

alter system set pga_aggregate_target = 100M scope = both;
or if using AMM:
alter system set sga_target = 100M scope = both;
alter system set memory_target = 100M scope = both;

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