Indexmenu Plugin: If you use the 'js'-option of the indexmenu plugin, you have to disable the 'defer_js'-setting. This setting is temporary, in the future the indexmenu plugin will be improved.
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https://www.ibm.com/support/knowledgecenter/en/SSEPEK_10.0.0/sqlref/src/tpc/db2z_limits.html