ORA-04030 (qmcxdDecodeIni,qmemNextBuf:Large Alloc) (Doc ID 1570125.1)

Last updated on SEPTEMBER 03, 2015

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 to 12.1.0.1 [Release 11.2 to 12.1]
Information in this document applies to any platform.

Symptoms

Alert log reports error:

ORA-04030: out of process memory when trying to allocate 55600 bytes (qmcxdDecodeIni,qmemNextBuf:Large Alloc)


The incident trace file shows characteristics like: 

TOP 10 MEMORY USES FOR THIS PROCESS
---------------------------------------

*** 2013-07-01 10:20:56.953
57% 3019 MB, 358407 chunks: "permanent memory          "  
        qmcxdDecodeIni  ds=0x2b44cf126430  dsprt=0x2b44ce4d63d8
28% 1483 MB, 71920 chunks: "permanent memory          "  
        kolarsCreateCt  ds=0x2b44cebc6478  dsprt=0x2b437f9b09d8
8%  417 MB, 35881 chunks: "qmcxdDecode:ctx           "  
        kolarsCreateCt  ds=0x2b44ce4b6740  dsprt=0x2b437f9b09d8


We see that "qmcxdDecodeIni" and "kolarsCreateCt" are the top two consumers of permanent memory exceeding 4GB.

The failing sql statement is found in the trace file under 'Current SQL Statement'. It may use XML code. Check the DDL for the tables involved in the failing sql statement.

Cause

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