DBCA error Java.lang.OutOfMemoryError: Java Heap Space" Error

We can increase the default 128m memory value in dbca file and start dbca again

Windows :

1. Navigate to ORACLE_HOME/BIN (Take a backup dbca.bat)

2. Find and edit file dbca.bat with the below 

"D:\Oracle_DB\product\11.2.0\dbhome_1\jdk\jre\BIN\JAVA" -DORACLE_HOME="%OH%" -Doracle.installer.not_bootstrap=true -DJDBC_PROTOCOL=thin -mx128m oracle.sysman.assistants.dbca.Dbca %*

3. Modify "-mx128m" value to a higher value like -mx512m

Linux:

1. cd $ORACLE_HOME/bin

2. ls -ltr dbca

3. vi dbca and edit the value -mx128m

JRE_OPTIONS="${JRE_OPTIONS} -DSET_LAF=${SET_LAF} -Dsun.java2d.font.DisableAlgorithmicStyles=true -Dice.pilots.html4.ignoreNonGenericFonts=true -DDISPLAY=${DISPLAY} -DJDBC_PROTOCOL=thin -mx128m"