Whenever -blocksonly is specified, there is implicitly a zero size mempool. However, there is still a non-zero value for -maxmempool which will be shared with dbcache, leading to 300 MB extra usage. Fix this.
uiInterface.InitMessage(_("Pruning blockstore…").translated);
                chainstate->PruneAndFlush();
            }
        }
    } else {
        LogPrintf("Setting NODE_NETWORK on non-prune mode\n");
        nLocalServices = ServiceFlags(nLocalServices | NODE_NETWORK);
    }
     ********************************************************* Step 11: import blocks
    if (!CheckDiskSpace(gArgs.GetDataDirNet())) {
        InitError(strprintf(_("Error: Disk space is low for %s"), fs::quoted(fs::PathToString(gArgs.GetDataDirNet()))));
        return false;
    }
    if (!CheckDiskSpace(gArgs.GetBlocksDirPath())) {
        InitError(strprintf(_("Error: Disk space is low for %s"), fs::quoted(fs::PathToString(gArgs.GetBlocksDirPath()))));
        return false;
    }
    int chain_active_height = WITH_LOCK(cs_main, return chainman.ActiveChain().Height());
     On first startup, warn on low block storage space
    if (!fReindex && !fReindexChainState && chain_active_height <= 1) {
        uint64_t additional_bytes_needed = fPruneMode ? nPruneTarget
            : chainparams.AssumedBlockchainSize() * 1024 * 1024 * 1024;
        if (!CheckDiskSpace(args.GetBlocksDirPath(), additional_bytes_needed)) {
            InitWarning(strprintf(_(
                    "Disk space for %s may not accommodate the block files. " \
                    "Approximately %u GB of data will be stored in this directory."
                ),
                fs::quoted(fs::PathToString(args.GetBlocksDirPath())),
                chainparams.AssumedBlockchainSize()
            ));